Rich Felker
5ce3737931
libc.h was intended to be a header for access to global libc state and related interfaces, but ended up included all over the place because it was the way to get the weak_alias macro. most of the inclusions removed here are places where weak_alias was needed. a few were recently introduced for hidden. some go all the way back to when libc.h defined CANCELPT_BEGIN and _END, and all (wrongly implemented) cancellation points had to include it. remaining spurious users are mostly callers of the LOCK/UNLOCK macros and files that use the LFS64 macro to define the awful *64 aliases. in a few places, new inclusion of libc.h is added because several internal headers no longer implicitly include libc.h. declarations for __lockfile and __unlockfile are moved from libc.h to stdio_impl.h so that the latter does not need libc.h. putting them in libc.h made no sense at all, since the macros in stdio_impl.h are needed to use them correctly anyway.
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
#include <unistd.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <spawn.h>
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#include <errno.h>
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#include "pthread_impl.h"
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extern char **__environ;
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int system(const char *cmd)
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{
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pid_t pid;
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sigset_t old, reset;
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struct sigaction sa = { .sa_handler = SIG_IGN }, oldint, oldquit;
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int status = -1, ret;
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posix_spawnattr_t attr;
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pthread_testcancel();
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if (!cmd) return 1;
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sigaction(SIGINT, &sa, &oldint);
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sigaction(SIGQUIT, &sa, &oldquit);
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sigaddset(&sa.sa_mask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &sa.sa_mask, &old);
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sigemptyset(&reset);
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if (oldint.sa_handler != SIG_IGN) sigaddset(&reset, SIGINT);
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if (oldquit.sa_handler != SIG_IGN) sigaddset(&reset, SIGQUIT);
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posix_spawnattr_init(&attr);
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posix_spawnattr_setsigmask(&attr, &old);
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posix_spawnattr_setsigdefault(&attr, &reset);
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posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSIGDEF|POSIX_SPAWN_SETSIGMASK);
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ret = posix_spawn(&pid, "/bin/sh", 0, &attr,
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(char *[]){"sh", "-c", (char *)cmd, 0}, __environ);
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posix_spawnattr_destroy(&attr);
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if (!ret) while (waitpid(pid, &status, 0)<0 && errno == EINTR);
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sigaction(SIGINT, &oldint, NULL);
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sigaction(SIGQUIT, &oldquit, NULL);
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sigprocmask(SIG_SETMASK, &old, NULL);
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if (ret) errno = ret;
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return status;
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}
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