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glibc/hurd/hurd.h

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/* Copyright (C) 1993-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _HURD_H
#define _HURD_H 1
#include <features.h>
/* Get types, macros, constants and function declarations
for all Mach microkernel interaction. */
#include <mach.h>
#include <mach/mig_errors.h>
/* Get types and constants necessary for Hurd interfaces. */
#include <hurd/hurd_types.h>
/* Get MiG stub declarations for commonly used Hurd interfaces. */
#include <hurd/auth.h>
#include <hurd/process.h>
#include <hurd/fs.h>
#include <hurd/io.h>
/* Get `struct hurd_port' and related definitions implementing lightweight
user references for ports. These are used pervasively throughout the C
library; this is here to avoid putting it in nearly every source file. */
#include <hurd/port.h>
#include <errno.h>
#ifndef _HURD_H_EXTERN_INLINE
#define _HURD_H_EXTERN_INLINE __extern_inline
#endif
_HURD_H_EXTERN_INLINE int
__hurd_fail (error_t err)
{
switch (err)
{
case EMACH_SEND_INVALID_DEST:
case EMIG_SERVER_DIED:
/* The server has disappeared! */
err = (error_t) EIEIO;
break;
case KERN_NO_SPACE:
err = (error_t) ENOMEM;
break;
case KERN_INVALID_ARGUMENT:
err = (error_t) EINVAL;
break;
case 0:
return 0;
default:
break;
}
errno = err;
return -1;
}
/* Basic ports and info, initialized by startup. */
extern int _hurd_exec_flags; /* Flags word passed in exec_startup. */
extern struct hurd_port *_hurd_ports;
extern unsigned int _hurd_nports;
extern mode_t _hurd_umask;
extern sigset_t _hurdsig_traced;
/* Shorthand macro for internal library code referencing _hurd_ports (see
<hurd/port.h>). */
#define __USEPORT(which, expr) \
HURD_PORT_USE (&_hurd_ports[INIT_PORT_##which], (expr))
/* Function version of __USEPORT: calls OPERATE with a send right. */
extern error_t _hurd_ports_use (int which, error_t (*operate) (mach_port_t));
/* Base address and size of the initial stack set up by the exec server.
If using cthreads, this stack is deallocated in startup.
Not locked. */
extern vm_address_t _hurd_stack_base;
extern vm_size_t _hurd_stack_size;
/* Initial file descriptor table we were passed at startup. If we are
using a real dtable, these are turned into that and then cleared at
startup. If not, these are never changed after startup. Not locked. */
extern mach_port_t *_hurd_init_dtable;
extern mach_msg_type_number_t _hurd_init_dtablesize;
/* Current process IDs. */
extern pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
extern int _hurd_orphaned;
/* This variable is incremented every time the process IDs change. */
extern unsigned int _hurd_pids_changed_stamp;
/* This condition is broadcast every time the process IDs change. */
extern struct condition _hurd_pids_changed_sync;
/* Unix `data break', for brk and sbrk.
If brk and sbrk are not used, this info will not be initialized or used. */
/* Data break. This is what `sbrk (0)' returns. */
extern vm_address_t _hurd_brk;
/* End of allocated space. This is generally `round_page (_hurd_brk)'. */
extern vm_address_t _hurd_data_end;
/* This mutex locks _hurd_brk and _hurd_data_end. */
extern struct mutex _hurd_brk_lock;
/* Set the data break to NEWBRK; _hurd_brk_lock must
be held, and is released on return. */
extern int _hurd_set_brk (vm_address_t newbrk);
#include <bits/types/FILE.h>
/* Calls to get and set basic ports. */
extern error_t _hurd_ports_get (unsigned int which, mach_port_t *result);
extern error_t _hurd_ports_set (unsigned int which, mach_port_t newport);
extern process_t getproc (void);
extern file_t getcwdir (void), getcrdir (void);
extern auth_t getauth (void);
extern mach_port_t getcttyid (void);
extern int setproc (process_t);
extern int setcwdir (file_t), setcrdir (file_t);
extern int setcttyid (mach_port_t);
/* Does reauth with the proc server and fd io servers. */
extern int __setauth (auth_t), setauth (auth_t);
/* Modify a port cell by looking up a directory name.
This verifies that it is a directory and that we have search permission. */
extern int _hurd_change_directory_port_from_name (struct hurd_port *portcell,
const char *name);
/* Same thing, but using an open file descriptor.
Also verifies that it is a directory and that we have search permission. */
extern int _hurd_change_directory_port_from_fd (struct hurd_port *portcell,
int fd);
/* Get and set the effective UID set. */
extern int geteuids (int __n, uid_t *__uidset);
extern int seteuids (int __n, const uid_t *__uidset);
/* Split FILE into a directory and a name within the directory. The
directory lookup uses the current root and working directory. If
successful, stores in *NAME a pointer into FILE where the name
within directory begins and returns a port to the directory;
otherwise sets `errno' and returns MACH_PORT_NULL. */
extern file_t __file_name_split (const char *file, char **name);
extern file_t file_name_split (const char *file, char **name);
/* Split DIRECTORY into a parent directory and a name within the directory.
This is the same as file_name_split, but ignores trailing slashes. */
extern file_t __directory_name_split (const char *file, char **name);
extern file_t directory_name_split (const char *file, char **name);
/* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>).
The file lookup uses the current root and working directory.
Returns a port to the file if successful; otherwise sets `errno'
and returns MACH_PORT_NULL. */
extern file_t __file_name_lookup (const char *file, int flags, mode_t mode);
extern file_t file_name_lookup (const char *file, int flags, mode_t mode);
/* Open a port to FILE with the given FLAGS and MODE (see <fcntl.h>). The
file lookup uses the current root directory, but uses STARTDIR as the
"working directory" for file relative names. Returns a port to the file
if successful; otherwise sets `errno' and returns MACH_PORT_NULL. */
extern file_t __file_name_lookup_under (file_t startdir, const char *file,
int flags, mode_t mode);
extern file_t file_name_lookup_under (file_t startdir, const char *file,
int flags, mode_t mode);
/* Lookup FILE_NAME and return the node opened with FLAGS & MODE
(see hurd_file_name_lookup for details), but a simple file name (without
any directory prefixes) will be consecutively prefixed with the pathnames
in the `:' separated list PATH until one succeeds in a successful lookup.
If none succeed, then the first error that wasn't ENOENT is returned, or
ENOENT if no other errors were returned. If PREFIXED_NAME is non-NULL,
then if the result is looked up directly, *PREFIXED_NAME is set to NULL, and
if it is looked up using a prefix from PATH, *PREFIXED_NAME is set to
malloc'd storage containing the prefixed name. */
extern file_t file_name_path_lookup (const char *file_name, const char *path,
int flags, mode_t mode,
char **prefixed_name);
/* Open a file descriptor on a port. FLAGS are as for `open'; flags
affected by io_set_openmodes are not changed by this. If successful,
this consumes a user reference for PORT (which will be deallocated on
close). */
extern int openport (io_t port, int flags);
/* Open a stream on a port. MODE is as for `fopen'.
If successful, this consumes a user reference for PORT
(which will be deallocated on fclose). */
extern FILE *fopenport (io_t port, const char *mode);
extern FILE *__fopenport (io_t port, const char *mode);
/* Execute a file, replacing TASK's current program image. */
extern error_t _hurd_exec (task_t task,
file_t file,
char *const argv[],
char *const envp[]);
/* Inform the proc server we have exited with STATUS, and kill the
task thoroughly. This function never returns, no matter what. */
extern void _hurd_exit (int status) __attribute__ ((noreturn));
/* Initialize the library data structures from the
ints and ports passed to us by the exec server.
Then vm_deallocate PORTARRAY and INTARRAY. */
extern void _hurd_init (int flags, char **argv,
mach_port_t *portarray, size_t portarraysize,
int *intarray, size_t intarraysize);
/* Do startup handshaking with the proc server, and initialize library data
structures that require proc server interaction. This includes
initializing signals; see _hurdsig_init in <hurd/signal.h>. */
extern void _hurd_proc_init (char **argv,
const int *intarray, size_t intarraysize);
/* Return the socket server for sockaddr domain DOMAIN. If DEAD is
nonzero, remove the old cached port and always do a fresh lookup.
It is assumed that a socket server will stay alive during a complex socket
operation involving several RPCs. But a socket server may die during
long idle periods between socket operations. Callers should first pass
zero for DEAD; if the first socket RPC tried on the returned port fails
with MACH_SEND_INVALID_DEST or MIG_SERVER_DIED (indicating the server
went away), the caller should call _hurd_socket_server again with DEAD
nonzero and retry the RPC on the new socket server port. */
extern socket_t _hurd_socket_server (int domain, int dead);
/* Send a `sig_post' RPC to process number PID. If PID is zero,
send the message to all processes in the current process's process group.
If PID is < -1, send SIG to all processes in process group - PID.
SIG and REFPORT are passed along in the request message. */
extern error_t _hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
extern error_t hurd_sig_post (pid_t pid, int sig, mach_port_t refport);
/* Fetch the host privileged port and device master port from the proc
server. They are fetched only once and then cached in the
variables below. A special program that gets them from somewhere
other than the proc server (such as a bootstrap filesystem) can set
these variables to install the ports. */
extern kern_return_t __get_privileged_ports (mach_port_t *host_priv_ptr,
device_t *device_master_ptr);
extern kern_return_t get_privileged_ports (mach_port_t *host_priv_ptr,
device_t *device_master_ptr);
extern mach_port_t _hurd_host_priv, _hurd_device_master;
/* Return the PID of the task whose control port is TASK.
On error, sets `errno' and returns -1. */
extern pid_t __task2pid (task_t task), task2pid (task_t task);
/* Return the task control port of process PID.
On error, sets `errno' and returns MACH_PORT_NULL. */
extern task_t __pid2task (pid_t pid), pid2task (pid_t pid);
/* Return the current thread's thread port. This is a cheap operation (no
system call), but it relies on Hurd signal state being set up. */
extern thread_t hurd_thread_self (void);
/* Cancel pending operations on THREAD. If it is doing an interruptible RPC,
that RPC will now return EINTR; otherwise, the "cancelled" flag will be
set, causing the next `hurd_check_cancel' call to return nonzero or the
next interruptible RPC to return EINTR (whichever is called first). */
extern error_t hurd_thread_cancel (thread_t thread);
/* Test and clear the calling thread's "cancelled" flag. */
extern int hurd_check_cancel (void);
/* Return the io server port for file descriptor FD.
This adds a Mach user reference to the returned port.
On error, sets `errno' and returns MACH_PORT_NULL. */
extern io_t __getdport (int fd), getdport (int fd);
#include <stdarg.h>
/* Write formatted output to PORT, a Mach port supporting the i/o protocol,
according to the format string FORMAT, using the argument list in ARG. */
int vpprintf (io_t port, const char *format, va_list arg);
#endif /* hurd.h */
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