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adaint.c, [...] (to_ptr32): New function.

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2005-02-09  Doug Rupp  <rupp@adacore.com>
	    Thomas Quinot  <quinot@adacore.com>

	* adaint.c, adaint.h
	[VMS] (to_ptr32): New function.
	(MAYBE_TO_PTR32): New macro.
	(__gnat_portable_spawn,__gnat_portable_no_block_spawn): Adjust argv
	for pointer size.
	[VMS] (descriptor_s, ile_s): Use __char_ptr32 for adr field.
	[VMS] (#define fork()): Remove since unneccessary.
	(__gnat_set_close_on_exec): New routine to support
	GNAT.OS_Lib.Set_Close_On_Exec.

	* g-expect.adb (Set_Up_Communications): Mark the pipe descriptors for
	the parent side as close-on-exec so that they are not inherited by the
	child.

	* g-os_lib.ads, g-os_lib.adb (Set_Close_On_Exec): New subprogram to
	set or clear the FD_CLOEXEC flag on a file descriptor.

From-SVN: r94811
This commit is contained in:
Doug Rupp 2005-02-10 14:51:58 +01:00 committed by Arnaud Charlet
parent 4e45e7a930
commit cc892b2c91
5 changed files with 326 additions and 240 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
gcc/ada/adaint.c
View File

@ -6,7 +6,7 @@
* *
* C Implementation File *
* *
* Copyright (C) 1992-2004, Free Software Foundation, Inc. *
* Copyright (C) 1992-2005, Free Software Foundation, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
@ -277,6 +277,37 @@ int max_path_len = GNAT_MAX_PATH_LEN;
system provides the routine readdir_r. */
#undef HAVE_READDIR_R
#if defined(VMS) && defined (__LONG_POINTERS)
/* Return a 32 bit pointer to an array of 32 bit pointers
given a 64 bit pointer to an array of 64 bit pointers */
typedef __char_ptr32 *__char_ptr_char_ptr32 __attribute__ ((mode (SI)));
static __char_ptr_char_ptr32
to_ptr32 (char **ptr64)
{
int argc;
__char_ptr_char_ptr32 short_argv;
for (argc=0; ptr64[argc]; argc++);
/* Reallocate argv with 32 bit pointers. */
short_argv = (__char_ptr_char_ptr32) decc$malloc
(sizeof (__char_ptr32) * (argc + 1));
for (argc=0; ptr64[argc]; argc++)
short_argv[argc] = (__char_ptr32) decc$strdup (ptr64[argc]);
short_argv[argc] = (__char_ptr32) 0;
return short_argv;
}
#define MAYBE_TO_PTR32(argv) to_ptr32 (argv)
#else
#define MAYBE_TO_PTR32(argv) argv
#endif
void
__gnat_to_gm_time
(OS_Time *p_time,
@ -1213,13 +1244,13 @@ static char *to_host_path_spec (char *);
struct descriptor_s
{
unsigned short len, mbz;
char *adr;
__char_ptr32 adr;
};
typedef struct _ile3
{
unsigned short len, code;
char *adr;
__char_ptr32 adr;
unsigned short *retlen_adr;
} ile_s;
@ -1524,17 +1555,6 @@ __gnat_is_symbolic_link (char *name ATTRIBUTE_UNUSED)
#endif
}
#ifdef VMS
/* Defined in VMS header files. */
#if defined (__ALPHA)
#define fork() (decc$$alloc_vfork_blocks() >= 0 ? \
LIB$GET_CURRENT_INVO_CONTEXT (decc$$get_vfork_jmpbuf()) : -1)
#elif defined (__IA64)
#define fork() (decc$$alloc_vfork_blocks() >= 0 ? \
LIB$I64_GET_CURR_INVO_CONTEXT(decc$$get_vfork_jmpbuf()) : -1)
#endif
#endif
#if defined (sun) && defined (__SVR4)
/* Using fork on Solaris will duplicate all the threads. fork1, which
duplicates only the active thread, must be used instead, or spawning
@ -1585,7 +1605,7 @@ __gnat_portable_spawn (char *args[])
if (pid == 0)
{
/* The child. */
if (execv (args[0], args) != 0)
if (execv (args[0], MAYBE_TO_PTR32 (args)) != 0)
#if defined (VMS)
return -1; /* execv is in parent context on VMS. */
#else
@ -1866,7 +1886,7 @@ __gnat_portable_no_block_spawn (char *args[])
if (pid == 0)
{
/* The child. */
if (execv (args[0], args) != 0)
if (execv (args[0], MAYBE_TO_PTR32 (args)) != 0)
#if defined (VMS)
return -1; /* execv is in parent context on VMS. */
#else
@ -2593,3 +2613,24 @@ get_gcc_version (void)
{
return 3;
}
int
__gnat_set_close_on_exec (int fd, int close_on_exec_p)
{
#if defined (F_GETFD) && defined (FD_CLOEXEC) && ! defined (__vxworks)
int flags = fcntl (fd, F_GETFD, 0);
if (flags < 0)
return flags;
if (close_on_exec_p)
flags |= FD_CLOEXEC;
else
flags &= ~FD_CLOEXEC;
return fcntl (fd, F_SETFD, flags | FD_CLOEXEC);
#else
return -1;
/* For the Windows case, we should use SetHandleInformation to remove
the HANDLE_INHERIT property from fd. This is not implemented yet,
but for our purposes (support of GNAT.Expect) this does not matter,
as by default handles are *not* inherited. */
#endif
}

3
gcc/ada/adaint.h
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@ -6,7 +6,7 @@
* *
* C Header File *
* *
* Copyright (C) 1992-2004 Free Software Foundation, Inc. *
* Copyright (C) 1992-2005 Free Software Foundation, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
@ -149,6 +149,7 @@ extern void __gnat_set_binary_mode (int);
extern void __gnat_set_text_mode (int);
extern char *__gnat_ttyname (int);
extern int __gnat_lseek (int, long, int);
extern int __gnat_set_close_on_exec (int, int);
extern int __gnat_dup (int);
extern int __gnat_dup2 (int, int);

22
gcc/ada/g-expect.adb
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@ -6,7 +6,7 @@
-- --
-- B o d y --
-- --
-- Copyright (C) 2000-2003 Ada Core Technologies, Inc. --
-- Copyright (C) 2000-2005 Ada Core Technologies, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
@ -1123,6 +1123,8 @@ package body GNAT.Expect is
Pipe2 : access Pipe_Type;
Pipe3 : access Pipe_Type)
is
Status : Boolean;
begin
-- Create the pipes
@ -1134,18 +1136,36 @@ package body GNAT.Expect is
return;
end if;
-- Record the 'parent' end of the two pipes in Pid:
-- Child stdin is connected to the 'write' end of Pipe1;
-- Child stdout is connected to the 'read' end of Pipe2.
-- We do not want these descriptors to remain open in the child
-- process, so we mark them close-on-exec/non-inheritable.
Pid.Input_Fd := Pipe1.Output;
Set_Close_On_Exec (Pipe1.Output, True, Status);
Pid.Output_Fd := Pipe2.Input;
Set_Close_On_Exec (Pipe2.Input, True, Status);
if Err_To_Out then
-- Reuse the standard output pipe for standard error
Pipe3.all := Pipe2.all;
else
-- Create a separate pipe for standard error
if Create_Pipe (Pipe3) /= 0 then
return;
end if;
end if;
-- As above, we record the proper fd for the child's
-- standard error stream.
Pid.Error_Fd := Pipe3.Input;
Set_Close_On_Exec (Pipe3.Input, True, Status);
end Set_Up_Communications;
----------------------------------

27
gcc/ada/g-os_lib.adb
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@ -6,7 +6,7 @@
-- --
-- B o d y --
-- --
-- Copyright (C) 1995-2004 Ada Core Technologies, Inc. --
-- Copyright (C) 1995-2005 Ada Core Technologies, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
@ -1075,7 +1075,7 @@ package body GNAT.OS_Lib is
S : Integer;
begin
-- Use the global lock because To_GM_Time is not thread safe.
-- Use the global lock because To_GM_Time is not thread safe
Locked_Processing : begin
SSL.Lock_Task.all;
@ -1920,7 +1920,7 @@ package body GNAT.OS_Lib is
if Status <= 0 then
Last := Finish + 1;
-- Replace symbolic link with its value.
-- Replace symbolic link with its value
else
if Is_Absolute_Path (Link_Buffer (1 .. Status)) then
@ -2056,6 +2056,23 @@ package body GNAT.OS_Lib is
Rename_File (C_Old_Name'Address, C_New_Name'Address, Success);
end Rename_File;
-----------------------
-- Set_Close_On_Exec --
-----------------------
procedure Set_Close_On_Exec
(FD : File_Descriptor;
Close_On_Exec : Boolean;
Status : out Boolean)
is
function C_Set_Close_On_Exec
(FD : File_Descriptor; Close_On_Exec : System.CRTL.int)
return System.CRTL.int;
pragma Import (C, C_Set_Close_On_Exec, "__gnat_set_close_on_exec");
begin
Status := C_Set_Close_On_Exec (FD, Boolean'Pos (Close_On_Exec)) = 0;
end Set_Close_On_Exec;
--------------------
-- Set_Executable --
--------------------
@ -2186,7 +2203,7 @@ package body GNAT.OS_Lib is
Dup2 (Saved_Error, Standerr);
end if;
-- And close the saved standard output and error file descriptors.
-- And close the saved standard output and error file descriptors
Close (Saved_Output);
@ -2234,7 +2251,7 @@ package body GNAT.OS_Lib is
is
procedure Spawn (Args : Argument_List);
-- Call Spawn.
-- Call Spawn with given argument list
N_Args : Argument_List (Args'Range);
-- Normalized arguments

441
gcc/ada/g-os_lib.ads
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@ -6,7 +6,7 @@
-- --
-- S p e c --
-- --
-- Copyright (C) 1995-2004 Free Software Foundation, Inc. --
-- Copyright (C) 1995-2005 Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
@ -36,36 +36,39 @@
-- This package contains types and procedures for interfacing to the
-- underlying OS. It is used by the GNAT compiler and by tools associated
-- with the GNAT compiler, and therefore works for the various operating
-- systems to which GNAT has been ported. This package will undoubtedly
-- grow as new services are needed by various tools.
-- systems to which GNAT has been ported. This package will undoubtedly grow
-- as new services are needed by various tools.
-- This package tends to use fairly low-level Ada in order to not bring
-- in large portions of the RTL. For example, functions return access
-- to string as part of avoiding functions returning unconstrained types.
-- This package tends to use fairly low-level Ada in order to not bring in
-- large portions of the RTL. For example, functions return access to string
-- as part of avoiding functions returning unconstrained types.
-- Except where specifically noted, these routines are portable across
-- all GNAT implementations on all supported operating systems.
-- Except where specifically noted, these routines are portable across all
-- GNAT implementations on all supported operating systems.
with System;
with GNAT.Strings;
package GNAT.OS_Lib is
pragma Elaborate_Body (OS_Lib);
pragma Elaborate_Body (OS_Lib);
-----------------------
-- String Operations --
-----------------------
-- These are reexported from package Strings (which was introduced to
-- avoid different packages declarting different types unnecessarily).
-- See package GNAT.Strings for details.
subtype String_Access is Strings.String_Access;
-- General purpose string access type. Some of the functions in this
-- package allocate string results on the heap, and return a value of
-- this type. Note that the caller is responsible for freeing this
-- String to avoid memory leaks.
function "=" (Left, Right : in String_Access) return Boolean
renames Strings."=";
procedure Free (X : in out String_Access) renames Strings.Free;
-- This procedure is provided for freeing returned values of type
-- String_Access
subtype String_List is Strings.String_List;
function "=" (Left, Right : in String_List) return Boolean
renames Strings."=";
@ -79,15 +82,12 @@ pragma Elaborate_Body (OS_Lib);
return String_List renames Strings."&";
subtype String_List_Access is Strings.String_List_Access;
-- General purpose array and pointer for list of string accesses
function "=" (Left, Right : in String_List_Access) return Boolean
renames Strings."=";
procedure Free (Arg : in out String_List_Access)
renames Strings.Free;
-- Frees the given array and all strings that its elements reference,
-- and then sets the argument to null. Provided for freeing returned
-- values of this type (including Argument_List_Access).
---------------------
-- Time/Date Stuff --
@ -127,9 +127,9 @@ pragma Elaborate_Body (OS_Lib);
function ">" (X, Y : OS_Time) return Boolean;
function ">=" (X, Y : OS_Time) return Boolean;
function "<=" (X, Y : OS_Time) return Boolean;
-- Basic comparison operators on OS_Time with obvious meanings. Note
-- that these have Intrinsic convention, so for example it is not
-- permissible to create accesses to any of these functions.
-- Basic comparison operators on OS_Time with obvious meanings. Note that
-- these have Intrinsic convention, so for example it is not permissible
-- to create accesses to any of these functions.
procedure GM_Split
(Date : OS_Time;
@ -146,15 +146,15 @@ pragma Elaborate_Body (OS_Lib);
-- File Stuff --
----------------
-- These routines give access to the open/creat/close/read/write level
-- of I/O routines in the typical C library (these functions are not
-- part of the ANSI C standard, but are typically available in all
-- systems). See also package Interfaces.C_Streams for access to the
-- stream level routines.
-- These routines give access to the open/creat/close/read/write level of
-- I/O routines in the typical C library (these functions are not part of
-- the ANSI C standard, but are typically available in all systems). See
-- also package Interfaces.C_Streams for access to the stream level
-- routines.
-- Note on file names. If a file name is passed as type String in any
-- of the following specifications, then the name is a normal Ada string
-- and need not be NUL-terminated. However, a trailing NUL character is
-- Note on file names. If a file name is passed as type String in any of
-- the following specifications, then the name is a normal Ada string and
-- need not be NUL-terminated. However, a trailing NUL character is
-- permitted, and will be ignored (more accurately, the NUL and any
-- characters that follow it will be ignored).
@ -189,9 +189,8 @@ pragma Elaborate_Body (OS_Lib);
function Open_Read_Write
(Name : String;
Fmode : Mode) return File_Descriptor;
-- Open file Name for both reading and writing, returning file
-- descriptor. File descriptor returned is Invalid_FD if file cannot be
-- opened.
-- Open file Name for both reading and writing, returning file descriptor.
-- File descriptor returned is Invalid_FD if file cannot be opened.
function Create_File
(Name : String;
@ -224,29 +223,30 @@ pragma Elaborate_Body (OS_Lib);
Name : out Temp_File_Name);
-- Create and open for writing a temporary file in the current working
-- directory. The name of the file and the File Descriptor are returned.
-- The File Descriptor returned is Invalid_FD in the case of failure.
-- No mode parameter is provided. Since this is a temporary file,
-- there is no point in doing text translation on it.
-- On some OSes, the maximum number of temp files that can be
-- created with this procedure may be limited. When the maximum is
-- reached, this procedure returns Invalid_FD. On some OSes, there may be
-- a race condition between processes trying to create temp files
-- at the same time in the same directory using this procedure.
-- The File Descriptor returned is Invalid_FD in the case of failure. No
-- mode parameter is provided. Since this is a temporary file, there is no
-- point in doing text translation on it.
--
-- On some OSes, the maximum number of temp files that can be created with
-- this procedure may be limited. When the maximum is reached, this
-- procedure returns Invalid_FD. On some OSes, there may be a race
-- condition between processes trying to create temp files at the same
-- time in the same directory using this procedure.
procedure Create_Temp_File
(FD : out File_Descriptor;
Name : out String_Access);
-- Create and open for writing a temporary file in the current working
-- directory. The name of the file and the File Descriptor are returned.
-- No mode parameter is provided. Since this is a temporary file,
-- there is no point in doing text translation on it.
-- It is the responsibility of the caller to deallocate the access value
-- returned in Name.
-- This procedure will always succeed if the current working directory
-- is writable. If the current working directory is not writable, then
-- No mode parameter is provided. Since this is a temporary file, there is
-- no point in doing text translation on it. It is the responsibility of
-- the caller to deallocate the access value returned in Name.
--
-- This procedure will always succeed if the current working directory is
-- writable. If the current working directory is not writable, then
-- Invalid_FD is returned for the file descriptor and null for the Name.
-- There is no race condition problem between processes trying to
-- create temp files at the same time in the same directory.
-- There is no race condition problem between processes trying to create
-- temp files at the same time in the same directory.
procedure Close (FD : File_Descriptor; Status : out Boolean);
-- Close file referenced by FD. Status is False if the underlying service
@ -254,8 +254,18 @@ pragma Elaborate_Body (OS_Lib);
-- and invalid file descriptor (the file may have been closed twice).
procedure Close (FD : File_Descriptor);
-- Close file referenced by FD. This form is used when the caller
-- wants to ignore any possible error (see above for error cases).
-- Close file referenced by FD. This form is used when the caller wants to
-- ignore any possible error (see above for error cases).
procedure Set_Close_On_Exec
(FD : File_Descriptor;
Close_On_Exec : Boolean;
Status : out Boolean);
-- When Close_On_Exec is True, mark FD to be closed automatically when new
-- program is executed by the calling process (i.e. prevent FD from being
-- inherited by child processes). When Close_On_Exec is False, mark FD to
-- not be closed on exec (i.e. allow it to be inherited). Status is False
-- if the operation could not be performed.
procedure Delete_File (Name : String; Success : out Boolean);
-- Deletes file. Success is set True or False indicating if the delete is
@ -265,29 +275,29 @@ pragma Elaborate_Body (OS_Lib);
(Old_Name : String;
New_Name : String;
Success : out Boolean);
-- Rename a file. Success is set True or False indicating if the
-- rename is successful or not.
-- Rename a file. Success is set True or False indicating if the rename is
-- successful or not.
-- The following defines the mode for the Copy_File procedure below.
-- Note that "time stamps and other file attributes" in the descriptions
-- below refers to the creation and last modification times, and also
-- the file access (read/write/execute) status flags.
-- The following defines the mode for the Copy_File procedure below. Note
-- that "time stamps and other file attributes" in the descriptions below
-- refers to the creation and last modification times, and also the file
-- access (read/write/execute) status flags.
type Copy_Mode is
(Copy,
-- Copy the file. It is an error if the target file already exists.
-- The time stamps and other file attributes are preserved in the copy.
-- Copy the file. It is an error if the target file already exists. The
-- time stamps and other file attributes are preserved in the copy.
Overwrite,
-- If the target file exists, the file is replaced otherwise
-- the file is just copied. The time stamps and other file
-- attributes are preserved in the copy.
-- If the target file exists, the file is replaced otherwise the file
-- is just copied. The time stamps and other file attributes are
-- preserved in the copy.
Append);
-- If the target file exists, the contents of the source file
-- is appended at the end. Otherwise the source file is just
-- copied. The time stamps and other file attributes are
-- are preserved if the destination file does not exist.
-- If the target file exists, the contents of the source file is
-- appended at the end. Otherwise the source file is just copied. The
-- time stamps and other file attributes are are preserved if the
-- destination file does not exist.
type Attribute is
(Time_Stamps,
@ -295,8 +305,8 @@ pragma Elaborate_Body (OS_Lib);
-- attributes are set to normal default values for file creation.
Full,
-- All attributes are copied from the source file to the target
-- file. This includes the timestamps, and for example also includes
-- All attributes are copied from the source file to the target file.
-- This includes the timestamps, and for example also includes
-- read/write/execute attributes in Unix systems.
None);
@ -305,8 +315,8 @@ pragma Elaborate_Body (OS_Lib);
-- Note: The default is Time_Stamps, which corresponds to the normal
-- default on Windows style systems. Full corresponds to the typical
-- effect of "cp -p" on Unix systems, and None corresponds to the
-- typical effect of "cp" on Unix systems.
-- effect of "cp -p" on Unix systems, and None corresponds to the typical
-- effect of "cp" on Unix systems.
-- Note: Time_Stamps and Full are not supported on VMS and VxWorks
@ -320,15 +330,15 @@ pragma Elaborate_Body (OS_Lib);
-- Pathname can be a filename or directory name. In the latter case Name
-- is copied into the directory preserving the same file name. Mode
-- defines the kind of copy, see above with the default being a normal
-- copy in which the target file must not already exist. Success is set
-- to True or False indicating if the copy is successful (depending on
-- the specified Mode).
-- copy in which the target file must not already exist. Success is set to
-- True or False indicating if the copy is successful (depending on the
-- specified Mode).
--
-- Note: this procedure is only supported to a very limited extent on
-- VMS. The only supported mode is Overwrite, and the only supported
-- value for Preserve is None, resulting in the default action which
-- for Overwrite is to leave attributes unchanged. Furthermore, the
-- copy only works for simple text files.
-- Note: this procedure is only supported to a very limited extent on VMS.
-- The only supported mode is Overwrite, and the only supported value for
-- Preserve is None, resulting in the default action which for Overwrite
-- is to leave attributes unchanged. Furthermore, the copy only works for
-- simple text files.
procedure Copy_Time_Stamps (Source, Dest : String; Success : out Boolean);
-- Copy Source file time stamps (last modification and last access time
@ -343,16 +353,16 @@ pragma Elaborate_Body (OS_Lib);
(FD : File_Descriptor;
A : System.Address;
N : Integer) return Integer;
-- Read N bytes to address A from file referenced by FD. Returned value
-- is count of bytes actually read, which can be less than N at EOF.
-- Read N bytes to address A from file referenced by FD. Returned value is
-- count of bytes actually read, which can be less than N at EOF.
function Write
(FD : File_Descriptor;
A : System.Address;
N : Integer) return Integer;
-- Write N bytes from address A to file referenced by FD. The returned
-- value is the number of bytes written, which can be less than N if
-- a disk full condition was detected.
-- value is the number of bytes written, which can be less than N if a
-- disk full condition was detected.
Seek_Cur : constant := 1;
Seek_End : constant := 2;
@ -364,9 +374,9 @@ pragma Elaborate_Body (OS_Lib);
offset : Long_Integer;
origin : Integer);
pragma Import (C, Lseek, "__gnat_lseek");
-- Sets the current file pointer to the indicated offset value,
-- relative to the current position (origin = SEEK_CUR), end of
-- file (origin = SEEK_END), or start of file (origin = SEEK_SET).
-- Sets the current file pointer to the indicated offset value, relative
-- to the current position (origin = SEEK_CUR), end of file (origin =
-- SEEK_END), or start of file (origin = SEEK_SET).
function File_Length (FD : File_Descriptor) return Long_Integer;
pragma Import (C, File_Length, "__gnat_file_length");
@ -374,12 +384,12 @@ pragma Elaborate_Body (OS_Lib);
function File_Time_Stamp (Name : String) return OS_Time;
-- Given the name of a file or directory, Name, obtains and returns the
-- time stamp. This function can be used for an unopened file.
-- Returns Invalid_Time is Name doesn't correspond to an existing file.
-- time stamp. This function can be used for an unopened file. Returns
-- Invalid_Time is Name doesn't correspond to an existing file.
function File_Time_Stamp (FD : File_Descriptor) return OS_Time;
-- Get time stamp of file from file descriptor FD
-- Returns Invalid_Time is FD doesn't correspond to an existing file.
-- Get time stamp of file from file descriptor FD Returns Invalid_Time is
-- FD doesn't correspond to an existing file.
function Normalize_Pathname
(Name : String;
@ -394,43 +404,41 @@ pragma Elaborate_Body (OS_Lib);
-- directory if Directory is null. The result returned is the normalized
-- name of the file. For most cases, if two file names designate the same
-- file through different paths, Normalize_Pathname will return the same
-- canonical name in both cases. However, there are cases when this is
-- not true; for example, this is not true in Unix for two hard links
-- canonical name in both cases. However, there are cases when this is not
-- true; for example, this is not true in Unix for two hard links
-- designating the same file.
--
-- On Windows, the returned path will start with a drive letter except
-- when Directory is not empty and does not include a drive letter.
-- If Directory is empty (the default) and Name is a relative path
-- or an absolute path without drive letter, the letter of the current
-- drive will start the returned path. If Case_Sensitive is True
-- (the default), then this drive letter will be forced to upper case
-- ("C:\...").
-- when Directory is not empty and does not include a drive letter. If
-- Directory is empty (the default) and Name is a relative path or an
-- absolute path without drive letter, the letter of the current drive
-- will start the returned path. If Case_Sensitive is True (the default),
-- then this drive letter will be forced to upper case ("C:\...").
--
-- If Resolve_Links is set to True, then the symbolic links, on systems
-- that support them, will be fully converted to the name of the file
-- or directory pointed to. This is slightly less efficient, since it
-- that support them, will be fully converted to the name of the file or
-- directory pointed to. This is slightly less efficient, since it
-- requires system calls.
--
-- If Name cannot be resolved or is null on entry (for example if there is
-- a circularity in symbolic links: A is a symbolic link for B, while B is
-- a symbolic link for A), then Normalize_Pathname returns an empty string.
-- symbolic link circularity, e.g. A is a symbolic link for B, and B is a
-- symbolic link for A), then Normalize_Pathname returns an empty string.
--
-- In VMS, if Name follows the VMS syntax file specification, it is first
-- converted into Unix syntax. If the conversion fails, Normalize_Pathname
-- returns an empty string.
--
-- For case-sensitive file systems, the value of Case_Sensitive parameter
-- is ignored. For file systems that are not case-sensitive, such as
-- is ignored. For file systems that are not case-sensitive, such as
-- Windows and OpenVMS, if this parameter is set to False, then the file
-- and directory names are folded to lower case. This allows checking
-- whether two files are the same by applying this function to their names
-- and comparing the results. If Case_Sensitive is set to True, this
-- and comparing the results. If Case_Sensitive is set to True, this
-- function does not change the casing of file and directory names.
function Is_Absolute_Path (Name : String) return Boolean;
-- Returns True if Name is an absolute path name, i.e. it designates
-- a file or a directory absolutely, rather than relative to another
-- directory.
-- Returns True if Name is an absolute path name, i.e. it designates a
-- file or directory absolutely rather than relative to another directory.
function Is_Regular_File (Name : String) return Boolean;
-- Determines if the given string, Name, is the name of an existing
@ -446,25 +454,25 @@ pragma Elaborate_Body (OS_Lib);
-- a relative path name, it is relative to the current working directory.
function Is_Readable_File (Name : String) return Boolean;
-- Determines if the given string, Name, is the name of an existing
-- file that is readable. Returns True if so, False otherwise. Note
-- that this function simply interrogates the file attributes (e.g.
-- using the C function stat), so it does not indicate a situation
-- in which a file may not actually be readable due to some other
-- process having exclusive access.
-- Determines if the given string, Name, is the name of an existing file
-- that is readable. Returns True if so, False otherwise. Note that this
-- function simply interrogates the file attributes (e.g. using the C
-- function stat), so it does not indicate a situation in which a file may
-- not actually be readable due to some other process having exclusive
-- access.
function Is_Writable_File (Name : String) return Boolean;
-- Determines if the given string, Name, is the name of an existing
-- file that is writable. Returns True if so, False otherwise. Note
-- that this function simply interrogates the file attributes (e.g.
-- using the C function stat), so it does not indicate a situation
-- in which a file may not actually be writeable due to some other
-- process having exclusive access.
-- Determines if the given string, Name, is the name of an existing file
-- that is writable. Returns True if so, False otherwise. Note that this
-- function simply interrogates the file attributes (e.g. using the C
-- function stat), so it does not indicate a situation in which a file may
-- not actually be writeable due to some other process having exclusive
-- access.
function Is_Symbolic_Link (Name : String) return Boolean;
-- Determines if the given string, Name, is the path of a symbolic link
-- on systems that support it. Returns True if so, False if the path
-- is not a symbolic link or if the system does not support symbolic links.
-- Determines if the given string, Name, is the path of a symbolic link on
-- systems that support it. Returns True if so, False if the path is not a
-- symbolic link or if the system does not support symbolic links.
--
-- A symbolic link is an indirect pointer to a file; its directory entry
-- contains the name of the file to which it is linked. Symbolic links may
@ -496,16 +504,16 @@ pragma Elaborate_Body (OS_Lib);
(File_Name : String;
Path : String) return String_Access;
-- Try to locate a regular file whose name is given by File_Name in the
-- directories listed in Path. If a file is found, its full pathname is
-- directories listed in Path. If a file is found, its full pathname is
-- returned; otherwise, a null pointer is returned. If the File_Name given
-- is an absolute pathname, then Locate_Regular_File just checks that the
-- file exists and is a regular file. Otherwise, if the File_Name given
-- includes directory information, Locate_Regular_File first checks if
-- the file exists relative to the current directory. If it does not,
-- or if the File_Name given is a simple file name, the Path argument is
-- parsed according to OS conventions, and for each directory in the Path
-- a check is made if File_Name is a relative pathname of a regular file
-- from that directory.
-- includes directory information, Locate_Regular_File first checks if the
-- file exists relative to the current directory. If it does not, or if
-- the File_Name given is a simple file name, the Path argument is parsed
-- according to OS conventions, and for each directory in the Path a check
-- is made if File_Name is a relative pathname of a regular file from that
-- directory.
--
-- Note that this function allocates some memory for the returned value.
-- This memory needs to be deallocated after use.
@ -531,8 +539,8 @@ pragma Elaborate_Body (OS_Lib);
-- routine (using String in place of C_File_Name) defined above.
subtype C_File_Name is System.Address;
-- This subtype is used to document that a parameter is the address
-- of a null-terminated string containing the name of a file.
-- This subtype is used to document that a parameter is the address of a
-- null-terminated string containing the name of a file.
-- All the following functions need comments ???
@ -571,7 +579,7 @@ pragma Elaborate_Body (OS_Lib);
Success : out Boolean);
function File_Time_Stamp (Name : C_File_Name) return OS_Time;
-- Returns Invalid_Time is Name doesn't correspond to an existing file.
-- Returns Invalid_Time is Name doesn't correspond to an existing file
function Is_Regular_File (Name : C_File_Name) return Boolean;
function Is_Directory (Name : C_File_Name) return Boolean;
@ -589,9 +597,9 @@ pragma Elaborate_Body (OS_Lib);
------------------
subtype Argument_List is String_List;
-- Type used for argument list in call to Spawn. The lower bound
-- of the array should be 1, and the length of the array indicates
-- the number of arguments.
-- Type used for argument list in call to Spawn. The lower bound of the
-- array should be 1, and the length of the array indicates the number of
-- arguments.
subtype Argument_List_Access is String_List_Access;
-- Type used to return Argument_List without dragging in secondary stack.
@ -606,42 +614,45 @@ pragma Elaborate_Body (OS_Lib);
-- and Non_Blocking_Spawn call Normalize_Arguments automatically, but
-- since there is a guarantee that a second call does nothing, this
-- internal call will have no effect if Normalize_Arguments is called
-- before calling Spawn. The call to Normalize_Arguments assumes that
-- the individual referenced arguments in Argument_List are on the heap,
-- and may free them and reallocate if they are modified.
-- before calling Spawn. The call to Normalize_Arguments assumes that the
-- individual referenced arguments in Argument_List are on the heap, and
-- may free them and reallocate if they are modified.
procedure Spawn
(Program_Name : String;
Args : Argument_List;
Success : out Boolean);
-- The first parameter of function Spawn is the name of the executable.
-- The second parameter contains the arguments to be passed to the
-- program. Success is False if the named program could not be spawned
-- or its execution completed unsuccessfully. Note that the caller will
-- be blocked until the execution of the spawned program is complete.
-- For maximum portability, use a full path name for the Program_Name
-- argument. On some systems (notably Unix systems) a simple file
-- name may also work (if the executable can be located in the path).
-- This procedure spawns a program with a given list of arguments. The
-- first parameter of is the name of the executable. The second parameter
-- contains the arguments to be passed to this program. Success is False
-- if the named program could not be spawned or its execution completed
-- unsuccessfully. Note that the caller will be blocked until the
-- execution of the spawned program is complete. For maximum portability,
-- use a full path name for the Program_Name argument. On some systems
-- (notably Unix systems) a simple file name may also work (if the
-- executable can be located in the path).
--
-- "Spawn" should not be used in tasking applications.
-- "Spawn" should not be used in tasking applications. Why not??? More
-- documentation would be helpful here ??? Is it really tasking programs,
-- or tasking activity that cause trouble ???
--
-- Note: Arguments in Args that contain spaces and/or quotes such as
-- "--GCC=gcc -v" or "--GCC=""gcc -v""" are not portable across all
-- operating systems, and would not have the desired effect if they
-- were passed directly to the operating system. To avoid this problem,
-- Spawn makes an internal call to Normalize_Arguments, which ensures
-- that such arguments are modified in a manner that ensures that the
-- desired effect is obtained on all operating systems. The caller may
-- call Normalize_Arguments explicitly before the call (e.g. to print
-- out the exact form of arguments passed to the operating system). In
-- this case the guarantee a second call to Normalize_Arguments has no
-- effect ensures that the internal call will not affect the result.
-- Note that the implicit call to Normalize_Arguments may free and
-- reallocate some of the individual arguments.
-- operating systems, and would not have the desired effect if they were
-- passed directly to the operating system. To avoid this problem, Spawn
-- makes an internal call to Normalize_Arguments, which ensures that such
-- arguments are modified in a manner that ensures that the desired effect
-- is obtained on all operating systems. The caller may call
-- Normalize_Arguments explicitly before the call (e.g. to print out the
-- exact form of arguments passed to the operating system). In this case
-- the guarantee a second call to Normalize_Arguments has no effect
-- ensures that the internal call will not affect the result. Note that
-- the implicit call to Normalize_Arguments may free and reallocate some
-- of the individual arguments.
--
-- This function will always set Success to False under VxWorks and
-- other similar operating systems which have no notion of the concept
-- of a dynamically executable file.
-- This function will always set Success to False under VxWorks and other
-- similar operating systems which have no notion of the concept of
-- dynamically executable file.
function Spawn
(Program_Name : String;
@ -659,12 +670,10 @@ pragma Elaborate_Body (OS_Lib);
Output_File_Descriptor : File_Descriptor;
Return_Code : out Integer;
Err_To_Out : Boolean := True);
-- Similar to the procedure above, but redirects the output to
-- the file designated by Output_File_Descriptor. If Err_To_Out
-- is True, then the Standard Error output is also redirected.
--
-- Return_Code is set to the status code returned by the operating
-- system as described above.
-- Similar to the procedure above, but redirects the output to the file
-- designated by Output_File_Descriptor. If Err_To_Out is True, then the
-- Standard Error output is also redirected.
-- Return_Code is set to the status code returned by the operating system
--
-- "Spawn" should not be used in tasking applications.
@ -675,13 +684,13 @@ pragma Elaborate_Body (OS_Lib);
Success : out Boolean;
Return_Code : out Integer;
Err_To_Out : Boolean := True);
-- Similar to the procedure above, but saves the output of the command
-- to a file with the name Output_File.
-- Similar to the procedure above, but saves the output of the command to
-- a file with the name Output_File.
--
-- Success is set to True if the command is executed and its output
-- successfully written to the file. If Success is True, then
-- Return_Code will be set to the status code returned by the
-- operating system. Otherwise, Return_Code is undefined.
-- successfully written to the file. If Success is True, then Return_Code
-- will be set to the status code returned by the operating system.
-- Otherwise, Return_Code is undefined.
--
-- "Spawn" should not be used in tasking applications.
@ -691,31 +700,31 @@ pragma Elaborate_Body (OS_Lib);
-- comparison for equality.
Invalid_Pid : constant Process_Id;
-- A special value used to indicate errors, as described below.
-- A special value used to indicate errors, as described below
function Non_Blocking_Spawn
(Program_Name : String;
Args : Argument_List)
return Process_Id;
-- This is a non blocking call. The Process_Id of the spawned process
-- is returned. Parameters are to be used as in Spawn. If Invalid_Id
-- is returned the program could not be spawned.
-- This is a non blocking call. The Process_Id of the spawned process is
-- returned. Parameters are to be used as in Spawn. If Invalid_Id is
-- returned the program could not be spawned.
--
-- "Non_Blocking_Spawn" should not be used in tasking applications.
--
-- This function will always return Invalid_Id under VxWorks, since
-- there is no notion of executables under this OS.
-- This function will always return Invalid_Id under VxWorks, since there
-- is no notion of executables under this OS.
procedure Wait_Process (Pid : out Process_Id; Success : out Boolean);
-- Wait for the completion of any of the processes created by previous
-- calls to Non_Blocking_Spawn. The caller will be suspended until one
-- of these processes terminates (normally or abnormally). If any of
-- these subprocesses terminates prior to the call to Wait_Process (and
-- has not been returned by a previous call to Wait_Process), then the
-- call to Wait_Process is immediate. Pid identifies the process that
-- has terminated (matching the value returned from Non_Blocking_Spawn).
-- Success is set to True if this sub-process terminated successfully.
-- If Pid = Invalid_Id, there were no subprocesses left to wait on.
-- calls to Non_Blocking_Spawn. The caller will be suspended until one of
-- these processes terminates (normally or abnormally). If any of these
-- subprocesses terminates prior to the call to Wait_Process (and has not
-- been returned by a previous call to Wait_Process), then the call to
-- Wait_Process is immediate. Pid identifies the process that has
-- terminated (matching the value returned from Non_Blocking_Spawn).
-- Success is set to True if this sub-process terminated successfully. If
-- Pid = Invalid_Id, there were no subprocesses left to wait on.
--
-- This function will always set success to False under VxWorks, since
-- there is no notion of executables under this OS.
@ -723,9 +732,9 @@ pragma Elaborate_Body (OS_Lib);
function Argument_String_To_List
(Arg_String : String)
return Argument_List_Access;
-- Take a string that is a program and its arguments and parse it into
-- an Argument_List. Note that the result is allocated on the heap, and
-- must be freed by the programmer (when it is no longer needed) to avoid
-- Take a string that is a program and its arguments and parse it into an
-- Argument_List. Note that the result is allocated on the heap, and must
-- be freed by the programmer (when it is no longer needed) to avoid
-- memory leaks.
-------------------
@ -733,25 +742,24 @@ pragma Elaborate_Body (OS_Lib);
-------------------
function Getenv (Name : String) return String_Access;
-- Get the value of the environment variable. Returns an access
-- to the empty string if the environment variable does not exist
-- or has an explicit null value (in some operating systems these
-- are distinct cases, in others they are not; this interface
-- abstracts away that difference. The argument is allocated on
-- the heap (even in the null case), and needs to be freed explicitly
-- when no longer needed to avoid memory leaks.
-- Get the value of the environment variable. Returns an access to the
-- empty string if the environment variable does not exist or has an
-- explicit null value (in some operating systems these are distinct
-- cases, in others they are not; this interface abstracts away that
-- difference. The argument is allocated on the heap (even in the null
-- case), and needs to be freed explicitly when no longer needed to avoid
-- memory leaks.
procedure Setenv (Name : String; Value : String);
-- Set the value of the environment variable Name to Value. This call
-- modifies the current environment, but does not modify the parent
-- process environment. After a call to Setenv, Getenv (Name) will
-- always return a String_Access referencing the same String as Value.
-- This is true also for the null string case (the actual effect may
-- be to either set an explicit null as the value, or to remove the
-- entry, this is operating system dependent). Note that any following
-- calls to Spawn will pass an environment to the spawned process that
-- includes the changes made by Setenv calls. This procedure is not
-- available under VMS.
-- process environment. After a call to Setenv, Getenv (Name) will always
-- return a String_Access referencing the same String as Value. This is
-- true also for the null string case (the actual effect may be to either
-- set an explicit null as the value, or to remove the entry, this is
-- operating system dependent). Note that any following calls to Spawn
-- will pass an environment to the spawned process that includes the
-- changes made by Setenv calls. This procedure is not available on VMS.
procedure OS_Exit (Status : Integer);
pragma Import (C, OS_Exit, "__gnat_os_exit");
@ -762,37 +770,36 @@ pragma Elaborate_Body (OS_Lib);
pragma Import (C, OS_Abort, "abort");
pragma No_Return (OS_Abort);
-- Exit to OS signalling an abort (traceback or other appropriate
-- diagnostic information should be given if possible, or entry made
-- to the debugger if that is possible).
-- diagnostic information should be given if possible, or entry made to
-- the debugger if that is possible).
function Errno return Integer;
pragma Import (C, Errno, "__get_errno");
-- Return the task-safe last error number.
-- Return the task-safe last error number
procedure Set_Errno (Errno : Integer);
pragma Import (C, Set_Errno, "__set_errno");
-- Set the task-safe error number.
-- Set the task-safe error number
Directory_Separator : constant Character;
-- The character that is used to separate parts of a pathname.
-- The character that is used to separate parts of a pathname
Path_Separator : constant Character;
-- The character to separate paths in an environment variable value.
-- The character to separate paths in an environment variable value
private
pragma Import (C, Path_Separator, "__gnat_path_separator");
pragma Import (C, Directory_Separator, "__gnat_dir_separator");
type OS_Time is new Long_Integer;
-- Type used for timestamps in the compiler. This type is used to
-- hold time stamps, but may have a different representation than
-- C's time_t. This type needs to match the declaration of OS_Time
-- in adaint.h.
-- Type used for timestamps in the compiler. This type is used to hold
-- time stamps, but may have a different representation than C's time_t.
-- This type needs to match the declaration of OS_Time in adaint.h.
-- Add pragma Inline statements for comparison operations on OS_Time.
-- It would actually be nice to use pragma Import (Intrinsic) here,
-- but this was not properly supported till GNAT 3.15a, so that would
-- cause bootstrap path problems. To be changed later ???
-- Add pragma Inline statements for comparison operations on OS_Time. It
-- would actually be nice to use pragma Import (Intrinsic) here, but this
-- was not properly supported till GNAT 3.15a, so that would cause
-- bootstrap path problems. To be changed later ???
Invalid_Time : constant OS_Time := -1;
-- This value should match the return valud by __gnat_file_time_*