1 | #include <unistd.h>
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2 | #include <stdlib.h>
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3 | #include <signal.h>
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4 | #include <sys/wait.h>
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5 | #include <spawn.h>
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6 | #include <errno.h>
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7 | #include "pthread_impl.h"
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8 | #include "libc.h"
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9 |
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10 | extern char **__environ;
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11 |
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12 | int system(const char *cmd)
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13 | {
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14 | pid_t pid;
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15 | sigset_t old, reset;
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16 | struct sigaction sa = { .sa_handler = SIG_IGN }, oldint, oldquit;
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17 | int status = 0x7f00, ret;
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18 | posix_spawnattr_t attr;
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19 |
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20 | pthread_testcancel();
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21 |
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22 | if (!cmd) return 1;
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23 |
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24 | sigaction(SIGINT, &sa, &oldint);
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25 | sigaction(SIGQUIT, &sa, &oldquit);
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26 | sigaddset(&sa.sa_mask, SIGCHLD);
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27 | sigprocmask(SIG_BLOCK, &sa.sa_mask, &old);
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28 |
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29 | sigemptyset(&reset);
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30 | if (oldint.sa_handler != SIG_IGN) sigaddset(&reset, SIGINT);
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31 | if (oldquit.sa_handler != SIG_IGN) sigaddset(&reset, SIGQUIT);
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32 | posix_spawnattr_init(&attr);
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33 | posix_spawnattr_setsigmask(&attr, &old);
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34 | posix_spawnattr_setsigdefault(&attr, &reset);
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35 | posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSIGDEF|POSIX_SPAWN_SETSIGMASK);
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36 | ret = posix_spawn(&pid, "/bin/sh", 0, &attr,
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37 | (char *[]){"sh", "-c", (char *)cmd, 0}, __environ);
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38 | posix_spawnattr_destroy(&attr);
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39 |
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40 | if (!ret) while (waitpid(pid, &status, 0)<0 && errno == EINTR);
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41 | sigaction(SIGINT, &oldint, NULL);
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42 | sigaction(SIGQUIT, &oldquit, NULL);
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43 | sigprocmask(SIG_SETMASK, &old, NULL);
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44 |
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45 | if (ret) errno = ret;
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46 | return status;
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47 | }
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