mirror of
https://github.com/fluencelabs/musl
synced 2025-05-23 12:41:32 +00:00
71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
#include <fcntl.h>
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#include "stdio_impl.h"
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#include "pthread_impl.h"
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#include "syscall.h"
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static void dummy_0()
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{
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}
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weak_alias(dummy_0, __acquire_ptc);
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weak_alias(dummy_0, __release_ptc);
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pid_t __vfork(void);
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FILE *popen(const char *cmd, const char *mode)
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{
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int p[2], op, i;
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pid_t pid;
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FILE *f;
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sigset_t old;
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const char *modes = "rw", *mi = strchr(modes, *mode);
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if (mi) {
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op = mi-modes;
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} else {
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errno = EINVAL;
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return 0;
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}
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if (pipe2(p, O_CLOEXEC)) return NULL;
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f = fdopen(p[op], mode);
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if (!f) {
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__syscall(SYS_close, p[0]);
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__syscall(SYS_close, p[1]);
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return NULL;
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}
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sigprocmask(SIG_BLOCK, SIGALL_SET, &old);
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__acquire_ptc();
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pid = __vfork();
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if (pid) {
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__release_ptc();
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__syscall(SYS_close, p[1-op]);
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sigprocmask(SIG_SETMASK, &old, 0);
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if (pid < 0) {
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fclose(f);
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return 0;
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}
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f->pipe_pid = pid;
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return f;
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}
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/* See notes in system.c for why this is needed. */
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for (i=1; i<=8*__SYSCALL_SSLEN; i++) {
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struct sigaction sa;
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__libc_sigaction(i, 0, &sa);
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if (sa.sa_handler!=SIG_IGN && sa.sa_handler!=SIG_DFL) {
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sa.sa_handler = SIG_DFL;
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__libc_sigaction(i, &sa, 0);
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}
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}
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if (dup2(p[1-op], 1-op) < 0) _exit(127);
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fcntl(1-op, F_SETFD, 0);
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if (p[0] != 1-op) __syscall(SYS_close, p[0]);
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if (p[1] != 1-op) __syscall(SYS_close, p[1]);
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sigprocmask(SIG_SETMASK, &old, 0);
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execl("/bin/sh", "sh", "-c", cmd, (char *)0);
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_exit(127);
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}
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