newlib-cygwin/newlib/libc/sys/linux/system.c

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2002-05-17 Jeff Johnston <jjohnstn@redhat.com> * Makefile.am: Copy and install headers from sys/machine/include directory. Also pass $toollibdir to lower-level directories. * Makefile.in: Regenerated. * libc/include/stdio.h[!_REENT_ONLY]: Change stdin, stdout, and stderr to use _REENT macro instead of _impure_ptr directly. * libc/include/sys/config.h[__i386__][__linux__]: Define __DYNAMIC_REENT__. * libc/include/sys/reent.h[!_REENT_ONLY]: Change _REENT macro to be call to __getreent() function if !__SINGLE_THREAD__ and __DYNAMIC_REENT__ is set. * libc/reent/Makefile.am: Add support for getreent.c. * libc/reent/Makefile.in: Regenerated. * libc/string/strerror.c: Add check if EOPNOTSUPP and ENOTSUP are same. * libc/sys/linux/Makefile.am: Add support for new files. * libc/sys/linux/configure.in: Add $EXTRA_DIRS variable. * libc/sys/linux/Makefile.in: Regenerated. * libc/sys/linux/configure: Ditto. * libc/sys/linux/io.c: Add poll syscall. Also weak-alias __close, __read, __write, __poll, __open, __lseek, __fcntl from their __libc_ counterparts. * libc/sys/linux/io64.c: Add __libc_ prefix to lseek64 and open64 and weak-alias to regular names. * libc/sys/linux/pread64.c: Rename to __libc_pread64 and weak-alias to pread64 and __pread64. * libc/sys/linux/process.c: Weak_alias __libc_getpid to __getpid. * libc/sys/linux/pwrite64.c: Rename to __libc_pwrite64 and weak-alias to pwrite64. * libc/sys/linux/sched.c: Weak-alias __libc_sched_getparam, __libc_sched_getscheduler, __libc_sched_get_priority_max, __libc_sched_get_priority_min, and __libc_sched_setschedule to name with __ instead of __libc_. * libc/sys/linux/siglongjmp.c: Include <machine/weakalias.h>. Rename siglongjmp to __libc_siglongjmp and weak-alias to siglongjmp. Call __libc_longjmp instead of longjmp, from __libc_siglongjmp. * libc/sys/linux/signal.c: Rename raise to __libc_raise and weak-alias to raise. * libc/sys/linux/socket.c: Weak-alias __libc_connect to __connect and __libc_send to __send. * libc/sys/linux/time.c: Weak-alias __libc_gettimeofday to __gettimeofday. * libc/sys/linux/wait.c: Rename wait to __libc_wait and weak-alias it to wait. Rename wait3 to __libc_wait3 and weak-alias it to wait3. * libc/sys/linux/include/setjmp.h: Use __jmp_buf in sigjmp_buf type and typedef __jmp_buf to jmp_buf. * libc/sys/linux/machine/i386/Makefile.am: Add syscalls.c and setjmp.S. * libc/sys/linux/machine/i386/Makefile.in: Regenerated. * libc/sys/linux/machine/i386/crt0.c: Add support to clear .bss section. * libc/sys/linux/machine/i386/socketcall.h: Change to use __libc_ prefix for function macros and then use weak_alias() to regular names. * libc/sys/linux/machine/i386/syscall.h: Ditto. * libc/sys/linux/sys/errno.h: Define EOPNOTSUP to be ENOTSUP. * libc/sys/linux/sys/stdio.h: Define _flockfile and _funlockfile to be flockfile() and funlockfile() respectively. * libc/sys/linux/sys/types.h * libc/reent/getreent.c: New file. * libc/sys/linux/flockfile.c: Ditto. * libc/sys/linux/funlockfile.c: Ditto. * libc/sys/linux/getreent.c: Ditto. * libc/sys/linux/pread.c: Ditto. * libc/sys/linux/pwrite.c: Ditto. * libc/sys/linux/raise.c: Ditto. * libc/sys/linux/system.c: Ditto. * libc/sys/linux/tcdrain.c: Ditto. * libc/sys/linux/machine/i386/i386mach.h: Ditto. * libc/sys/linux/machine/i386/setjmp.S: Ditto. * libc/sys/linux/machine/i386/syscalls.c: Ditto. * libc/sys/linux/machine/i386/weakalias.h: Ditto. * libc/sys/linux/machine/i386/include/setjmp.h: Ditto.
2002-05-18 07:39:39 +08:00
/* Copyright (C) 1991-1999, 2000 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <signal.h>
#include <sys/types.h>
#include <errno.h>
#include <machine/weakalias.h>
#ifndef HAVE_GNU_LD
#define __environ environ
#endif
#define SHELL_PATH "/bin/sh" /* Path of the shell. */
#define SHELL_NAME "sh" /* Name to give it. */
/* Execute LINE as a shell command, returning its status. */
int
__libc_system (const char *line)
{
int status, save;
pid_t pid;
struct sigaction sa, intr, quit;
#ifndef WAITPID_CANNOT_BLOCK_SIGCHLD
sigset_t block, omask;
#endif
if (line == NULL)
/* Check that we have a command processor available. It might
not be available after a chroot(), for example. */
return __libc_system ("exit 0") == 0;
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
sigemptyset (&sa.sa_mask);
if (sigaction (SIGINT, &sa, &intr) < 0)
return -1;
if (sigaction (SIGQUIT, &sa, &quit) < 0)
{
save = errno;
(void) sigaction (SIGINT, &intr, (struct sigaction *) NULL);
errno = save;
return -1;
}
#ifndef WAITPID_CANNOT_BLOCK_SIGCHLD
/* SCO 3.2v4 has a bug where `waitpid' will never return if SIGCHLD is
blocked. This makes it impossible for `system' to be implemented in
compliance with POSIX.2-1992. They have acknowledged that this is a bug
but I have not seen nor heard of any forthcoming fix. */
sigemptyset (&block);
sigaddset (&block, SIGCHLD);
save = errno;
if (sigprocmask (SIG_BLOCK, &block, &omask) < 0)
{
if (errno == ENOSYS)
errno = save;
else
{
save = errno;
(void) sigaction (SIGINT, &intr, (struct sigaction *) NULL);
(void) sigaction (SIGQUIT, &quit, (struct sigaction *) NULL);
errno = save;
return -1;
}
}
# define UNBLOCK sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL)
#else
# define UNBLOCK 0
#endif
pid = fork ();
if (pid == (pid_t) 0)
{
/* Child side. */
const char *new_argv[4];
new_argv[0] = SHELL_NAME;
new_argv[1] = "-c";
new_argv[2] = line;
new_argv[3] = NULL;
/* Restore the signals. */
(void) sigaction (SIGINT, &intr, (struct sigaction *) NULL);
(void) sigaction (SIGQUIT, &quit, (struct sigaction *) NULL);
(void) UNBLOCK;
/* Exec the shell. */
(void) execve (SHELL_PATH, (char *const *) new_argv, __environ);
_exit (127);
}
else if (pid < (pid_t) 0)
/* The fork failed. */
status = -1;
else
/* Parent side. */
{
#ifdef NO_WAITPID
pid_t child;
do
{
child = wait (&status);
if (child <= -1 && errno != EINTR)
{
status = -1;
break;
}
/* Note that pid cannot be <= -1 and therefore the loop continues
when wait returned with EINTR. */
}
while (child != pid);
#else
int n;
do
n = waitpid (pid, &status, 0);
while (n == -1 && errno == EINTR);
if (n != pid)
status = -1;
#endif
}
save = errno;
if ((sigaction (SIGINT, &intr, (struct sigaction *) NULL) |
sigaction (SIGQUIT, &quit, (struct sigaction *) NULL) |
UNBLOCK) != 0)
{
if (errno == ENOSYS)
errno = save;
else
return -1;
}
return status;
}
weak_alias (__libc_system, system)