gcc/libiberty/pex-unix.c

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/* Utilities to execute a program in a subprocess (possibly linked by pipes
with other subprocesses), and wait for it. Generic Unix version
(also used for UWIN and VMS).
partition.h: Remove use of PARAMS. include/ 2005-03-27 Gabriel Dos Reis <gdr@integrable-solutions.net> * partition.h: Remove use of PARAMS. * obstack.h: Remove conditional prototypes __STDC__. * objalloc.h: Remove use of PARAMS. * splay-tree.h: Likewise. libiberty/ 2005-03-27 Gabriel Dos Reis <gdr@integrable-solutions.net> Convert libiberty to use ISO C prototype style 5/n. * random.c (srandom, initstate, setstate, random): Use ISO C prototypes. * putenv.c (putenv): Likewise. * physmem.c (physmem_available, physmem_total, main): Likewise. * pex-win32.c (fix_argv, pexecute, pwait): Likewise. * pex-unix.c (pexecute, pwait): Likewise. * pex-msdos.c (pexecute, pwait): Likewise. * pex-djgpp.c (pexecute, pwait): Likewise. * partition.c (partition_new, partition_delete, partition_union) (elem_compare, partition_print): Likewise. * obstack.c (_obstack_begin, _obstack_begin_1, _obstack_newchunk, _obstack_allocated_p, _obstack_free, obstack_free, _obstack_memory_used, print_and_abort, obstack_next_free, obstack_object_size, obstack_base): Likewise. Remove codes predicated on !defined(__STDC__). * objalloc.c (objalloc_create, _objalloc_alloc, objalloc_free, objalloc_free_block): Use ISO C prototypes. * mkstemps.c (mkstemps): Likewise. * memset.c (memset): Likewise. * mempcpy.c (mempcpy): Likewise. * rename.c (rename): Likewise. * rindex.c (rindex): Likewise. * setenv.c (setenv, unsetenv): Likewise. * sigsetmask.c (sigsetmask): Likewise. * snprintf.c (snprintf): Likewise. * sort.c (sort_pointers, xmalloc): Likewise. * spaces.c (spaces): Likewise. * splay-tree.c (splay_tree_delete_helper, splay_tree_splay_helper, splay_tree_splay, splay_tree_foreach_helper, splay_tree_xmalloc_allocate, splay_tree_new, splay_tree_xmalloc_allocate, splay_tree_new_with_allocator, splay_tree_delete, splay_tree_insert, splay_tree_remove, splay_tree_lookup, splay_tree_max, splay_tree_min, splay_tree_predecessor, splay_tree_successor, splay_tree_foreach, splay_tree_compare_ints, splay_tree_compare_pointers): Likewise. * stpcpy.c (stpcpy): Likewise. * stpncpy.c (stpncpy): Likewise. * strcasecmp.c (strcasecmp): Likewise. * strchr.c (strchr): Likewise. * strdup.c (strdup): Likewise. From-SVN: r97125
2005-03-28 06:22:33 +02:00
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005
Free Software Foundation, Inc.
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "config.h"
#include "libiberty.h"
#include "pex-common.h"
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#ifdef NEED_DECLARATION_ERRNO
extern int errno;
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_GETRUSAGE
#include <sys/time.h>
#include <sys/resource.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef vfork /* Autoconf may define this to fork for us. */
# define VFORK_STRING "fork"
#else
# define VFORK_STRING "vfork"
#endif
#ifdef HAVE_VFORK_H
#include <vfork.h>
#endif
#ifdef VMS
#define vfork() (decc$$alloc_vfork_blocks() >= 0 ? \
lib$get_current_invo_context(decc$$get_vfork_jmpbuf()) : -1)
#endif /* VMS */
/* File mode to use for private and world-readable files. */
#if defined (S_IRUSR) && defined (S_IWUSR) && defined (S_IRGRP) && defined (S_IWGRP) && defined (S_IROTH) && defined (S_IWOTH)
#define PUBLIC_MODE \
(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
#else
#define PUBLIC_MODE 0666
#endif
/* Get the exit status of a particular process, and optionally get the
time that it took. This is simple if we have wait4, slightly
harder if we have waitpid, and is a pain if we only have wait. */
static pid_t pex_wait (struct pex_obj *, pid_t, int *, struct pex_time *);
#ifdef HAVE_WAIT4
static pid_t
pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
struct pex_time *time)
{
pid_t ret;
struct rusage r;
#ifdef HAVE_WAITPID
if (time == NULL)
return waitpid (pid, status, 0);
#endif
ret = wait4 (pid, status, 0, &r);
if (time != NULL)
{
time->user_seconds = r.ru_utime.tv_sec;
time->user_microseconds= r.ru_utime.tv_usec;
time->system_seconds = r.ru_stime.tv_sec;
time->system_microseconds= r.ru_stime.tv_usec;
}
return ret;
}
#else /* ! defined (HAVE_WAIT4) */
#ifdef HAVE_WAITPID
#ifndef HAVE_GETRUSAGE
static pid_t
pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
struct pex_time *time)
{
if (time != NULL)
memset (time, 0, sizeof (struct pex_time));
return waitpid (pid, status, 0);
}
#else /* defined (HAVE_GETRUSAGE) */
static pid_t
pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
struct pex_time *time)
{
struct rusage r1, r2;
pid_t ret;
if (time == NULL)
return waitpid (pid, status, 0);
getrusage (RUSAGE_CHILDREN, &r1);
ret = waitpid (pid, status, 0);
if (ret < 0)
return ret;
getrusage (RUSAGE_CHILDREN, &r2);
time->user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec;
time->user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec;
if (r2.ru_utime.tv_usec < r1.ru_utime.tv_usec)
{
--time->user_seconds;
time->user_microseconds += 1000000;
}
time->system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec;
time->system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec;
if (r2.ru_stime.tv_usec < r1.ru_stime.tv_usec)
{
--time->system_seconds;
time->system_microseconds += 1000000;
}
return ret;
}
#endif /* defined (HAVE_GETRUSAGE) */
#else /* ! defined (HAVE_WAITPID) */
struct status_list
{
struct status_list *next;
pid_t pid;
int status;
struct pex_time time;
};
static pid_t
pex_wait (struct pex_obj *obj, pid_t pid, int *status, struct pex_time *time)
{
struct status_list **pp;
for (pp = (struct status_list **) &obj->sysdep;
*pp != NULL;
pp = &(*pp)->next)
{
if ((*pp)->pid == pid)
{
struct status_list *p;
p = *pp;
*status = p->status;
if (time != NULL)
*time = p->time;
*pp = p->next;
free (p);
return pid;
}
}
while (1)
{
pid_t cpid;
struct status_list *psl;
struct pex_time pt;
#ifdef HAVE_GETRUSAGE
struct rusage r1, r2;
#endif
if (time != NULL)
{
#ifdef HAVE_GETRUSAGE
getrusage (RUSAGE_CHILDREN, &r1);
#else
memset (&pt, 0, sizeof (struct pex_time));
#endif
}
cpid = wait (status);
#ifdef HAVE_GETRUSAGE
if (time != NULL && cpid >= 0)
{
getrusage (RUSAGE_CHILDREN, &r2);
pt.user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec;
pt.user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec;
if (pt.user_microseconds < 0)
{
--pt.user_seconds;
pt.user_microseconds += 1000000;
}
pt.system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec;
pt.system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec;
if (pt.system_microseconds < 0)
{
--pt.system_seconds;
pt.system_microseconds += 1000000;
}
}
#endif
if (cpid < 0 || cpid == pid)
{
if (time != NULL)
*time = pt;
return cpid;
}
libiberty.h (ACONCAT): Properly cast value of alloca(). include/ 2005-05-24 Gabriel Dos Reis <gdr@integrable-solutions.net> * libiberty.h (ACONCAT): Properly cast value of alloca(). * ansidecl.h (ATTRIBUTE_UNUSED_LABEL): Don't define if __cplusplus. libiberty/ 2005-05-24 Gabriel Dos Reis <gdr@integrable-solutions.net> * configure.ac: Check declarations for calloc(), getenv(), malloc(), realloc() and sbrk(). * config.in: Regenerate. * configure: Likewise. * alloca.c (C_alloca): Change "new" to "new_storage". Use XNEWVEC instead of xmalloc. * choose-temp.c (choose_temp_base): Use XNEWVEC instea od xmalloc. * concat.c (liiberty_concat_ptr): Surround definition with an extern "C" block, if __cplusplus. (concat): Use XNEWVEC instead of xmalloc. (reconcat): Likewise. * cp-demangle.c (struct d_print_template): Rename member "template" to "template_decl". Adjust use throughout the file. (d_print_resize): Properly cast return value of realloc(). (cplus_demangle_print): Same for malloc(). (d_demangle): Likewise. * cp-demint.c (cplus_demangle_fill_builtin_type): Rename parameter "typename" to "type_name". * cplus-dem.c (grow_vect): Use XRESIZEVEC instead of xrealloc(). (work_stuff_copy_to_from): Use XNEWVEC insteand of xmalloc(). (demangle_template_value_parm): Likewise. (demangle_template): Likewise. (recursively_demangle): Likewise. (do_hpacc_template_literal): Likewise. (do_arg): Likewise. (remember_type): Likewise. (remember_Ktype): Likewise. (register_Btype): Likewise. (string_need): Use XRESIZEVEC instead of xrealloc(). * dyn-string.c (dyn_string_init): Use XNEWVEC. (dyn_string_new): Use XNEW. (dyn_string_resize): Use XRESIZEVEC. * fnmatch.c (fnmatch): Rename local variable "not" to "negate". * getopt.c (getenv): Declare only if !__cplusplus and !getenv. Otherwise include <stdlib.h>. (exchange): Cast return value of malloc(). * hashtab.c (htab_size): Define as both macro and non-inline function. (htab_elements): Likewise. * getpwd.c (getpwd): Use XNEWVEC. (htab_create_alloc_ex): Use C90 prototype-style. * lrealpath.c (lrealpath): Appropriately cast return value of malloc(). * make-relative-prefix.c (save_string): Likewise. * make-temp-file.c (try_dir): Rename from "try". Adjust use in the file. (choose_tmpdir): Use XNEWVEC. * mkstemps.c (mkstemps): Rename parameter "template" to "pattern". * pex-common.c (pex_init_common): Use XNEW. (pex_add_remove): Use XRESIZEVEC. (pex_run): Likewise. (pex_get_status_and_time): Likewise. * pex-djgpp.c (pex_djgpp_exec_child): Likewise. * pex-msdos.c (pex_init): Use XNEW. (pex_msdos_exec_child): Likewise. (pex_msdos_exec_child): Use XRESIZEVEC. * pex-unix.c (pex_wait): Use XNEW. * pex-win32.c (fix_argv): Use XNEWVEC. * pexecute.c (pwait): Likewise. * setenv.c (setenv): Properly cast return value of malloc(). * sigsetmask.c (sigsetmask): Rename local variables "old" and "new" to "old_sig" and "new_sig". * sort.c (main): Use XNEWVEC. * spaces.c (spaces): Cast return value of malloc(). * strndup.c (strndup): Likewise. * ternary.c (ternary_insert): Use XNEW. * xmalloc.c (malloc, realloc, calloc, sbrk): Surround declaration with an extern "C" block if __cplusplus. * xstrdup.c (xstrdup): Cast return value of memcpy(). * xstrerror.c (strerror): Enclose declaration in an extern "C" block if __cplusplus. * xstrndup.c (xstrndup): Use XNEW. Cast return value of memcpy(). From-SVN: r100115
2005-05-24 22:48:25 +02:00
psl = XNEW (struct status_list);
psl->pid = cpid;
psl->status = *status;
if (time != NULL)
psl->time = pt;
psl->next = (struct status_list *) obj->sysdep;
obj->sysdep = (void *) psl;
}
}
#endif /* ! defined (HAVE_WAITPID) */
#endif /* ! defined (HAVE_WAIT4) */
static void pex_child_error (struct pex_obj *, const char *, const char *, int)
ATTRIBUTE_NORETURN;
static int pex_unix_open_read (struct pex_obj *, const char *, int);
static int pex_unix_open_write (struct pex_obj *, const char *, int);
static long pex_unix_exec_child (struct pex_obj *, int, const char *,
char * const *, int, int, int,
const char **, int *);
static int pex_unix_close (struct pex_obj *, int);
static int pex_unix_wait (struct pex_obj *, long, int *, struct pex_time *,
int, const char **, int *);
static int pex_unix_pipe (struct pex_obj *, int *, int);
static FILE *pex_unix_fdopenr (struct pex_obj *, int, int);
static FILE *pex_unix_fdopenw (struct pex_obj *, int, int);
static void pex_unix_cleanup (struct pex_obj *);
/* The list of functions we pass to the common routines. */
const struct pex_funcs funcs =
{
pex_unix_open_read,
pex_unix_open_write,
pex_unix_exec_child,
pex_unix_close,
pex_unix_wait,
pex_unix_pipe,
pex_unix_fdopenr,
pex_unix_fdopenw,
pex_unix_cleanup
};
/* Return a newly initialized pex_obj structure. */
struct pex_obj *
pex_init (int flags, const char *pname, const char *tempbase)
{
return pex_init_common (flags, pname, tempbase, &funcs);
}
/* Open a file for reading. */
static int
pex_unix_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
int binary ATTRIBUTE_UNUSED)
{
return open (name, O_RDONLY);
}
/* Open a file for writing. */
static int
pex_unix_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
int binary ATTRIBUTE_UNUSED)
{
/* Note that we can't use O_EXCL here because gcc may have already
created the temporary file via make_temp_file. */
return open (name, O_WRONLY | O_CREAT | O_TRUNC, PUBLIC_MODE);
}
/* Close a file. */
static int
pex_unix_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
{
return close (fd);
}
/* Report an error from a child process. We don't use stdio routines,
because we might be here due to a vfork call. */
static void
pex_child_error (struct pex_obj *obj, const char *executable,
const char *errmsg, int err)
{
#define writeerr(s) write (STDERR_FILE_NO, s, strlen (s))
writeerr (obj->pname);
writeerr (": error trying to exec '");
writeerr (executable);
writeerr ("': ");
writeerr (errmsg);
writeerr (": ");
writeerr (xstrerror (err));
writeerr ("\n");
_exit (-1);
}
/* Execute a child. */
static long
pex_unix_exec_child (struct pex_obj *obj, int flags, const char *executable,
char * const * argv, int in, int out, int errdes,
const char **errmsg, int *err)
{
pid_t pid;
/* We declare these to be volatile to avoid warnings from gcc about
them being clobbered by vfork. */
volatile int sleep_interval;
volatile int retries;
sleep_interval = 1;
pid = -1;
for (retries = 0; retries < 4; ++retries)
{
pid = vfork ();
if (pid >= 0)
break;
sleep (sleep_interval);
sleep_interval *= 2;
}
switch (pid)
{
case -1:
*err = errno;
*errmsg = VFORK_STRING;
return -1;
case 0:
/* Child process. */
if (in != STDIN_FILE_NO)
{
if (dup2 (in, STDIN_FILE_NO) < 0)
pex_child_error (obj, executable, "dup2", errno);
if (close (in) < 0)
pex_child_error (obj, executable, "close", errno);
}
if (out != STDOUT_FILE_NO)
{
if (dup2 (out, STDOUT_FILE_NO) < 0)
pex_child_error (obj, executable, "dup2", errno);
if (close (out) < 0)
pex_child_error (obj, executable, "close", errno);
}
if (errdes != STDERR_FILE_NO)
{
if (dup2 (errdes, STDERR_FILE_NO) < 0)
pex_child_error (obj, executable, "dup2", errno);
if (close (errdes) < 0)
pex_child_error (obj, executable, "close", errno);
}
if ((flags & PEX_STDERR_TO_STDOUT) != 0)
{
if (dup2 (STDOUT_FILE_NO, STDERR_FILE_NO) < 0)
pex_child_error (obj, executable, "dup2", errno);
}
if ((flags & PEX_SEARCH) != 0)
{
execvp (executable, argv);
pex_child_error (obj, executable, "execvp", errno);
}
else
{
execv (executable, argv);
pex_child_error (obj, executable, "execv", errno);
}
/* NOTREACHED */
return -1;
default:
/* Parent process. */
if (in != STDIN_FILE_NO)
{
if (close (in) < 0)
{
*err = errno;
*errmsg = "close";
return -1;
}
}
if (out != STDOUT_FILE_NO)
{
if (close (out) < 0)
{
*err = errno;
*errmsg = "close";
return -1;
}
}
if (errdes != STDERR_FILE_NO)
{
if (close (errdes) < 0)
{
*err = errno;
*errmsg = "close";
return -1;
}
}
return (long) pid;
}
}
/* Wait for a child process to complete. */
static int
pex_unix_wait (struct pex_obj *obj, long pid, int *status,
struct pex_time *time, int done, const char **errmsg,
int *err)
{
/* If we are cleaning up when the caller didn't retrieve process
status for some reason, encourage the process to go away. */
if (done)
kill (pid, SIGTERM);
if (pex_wait (obj, pid, status, time) < 0)
{
*err = errno;
*errmsg = "wait";
return -1;
}
return 0;
}
/* Create a pipe. */
static int
pex_unix_pipe (struct pex_obj *obj ATTRIBUTE_UNUSED, int *p,
int binary ATTRIBUTE_UNUSED)
{
return pipe (p);
}
/* Get a FILE pointer to read from a file descriptor. */
static FILE *
pex_unix_fdopenr (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
int binary ATTRIBUTE_UNUSED)
{
return fdopen (fd, "r");
}
static FILE *
pex_unix_fdopenw (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
int binary ATTRIBUTE_UNUSED)
{
if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0)
return NULL;
return fdopen (fd, "w");
}
static void
pex_unix_cleanup (struct pex_obj *obj ATTRIBUTE_UNUSED)
{
#if !defined (HAVE_WAIT4) && !defined (HAVE_WAITPID)
while (obj->sysdep != NULL)
{
struct status_list *this;
struct status_list *next;
this = (struct status_list *) obj->sysdep;
next = this->next;
free (this);
obj->sysdep = (void *) next;
}
#endif
}