Created
November 16, 2021 08:33
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Command hangs on macOS 11.5 if O_CLOEXEC is used
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#include <errno.h> | |
#include <fcntl.h> | |
#include <spawn.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
#define USE_O_CLOEXEC 1 | |
int main(int argc, char **argv) | |
{ | |
int pipefds[2]; | |
if (pipe(pipefds) != 0) { | |
fprintf(stderr, "pipe failed:%s\n", strerror(errno)); | |
exit(1); | |
} | |
#if USE_O_CLOEXEC | |
if (fcntl(pipefds[1], F_SETFD, O_CLOEXEC) == -1) { | |
fprintf(stderr, "fcntl failed:%s\n", strerror(errno)); | |
exit(1); | |
} | |
#endif | |
posix_spawn_file_actions_t actions; | |
posix_spawn_file_actions_init(&actions); | |
posix_spawn_file_actions_adddup2(&actions, pipefds[0], 0); /* use pipe as stdin */ | |
posix_spawn_file_actions_addclose(&actions, pipefds[0]); /* close the read-side of the pipe */ | |
#if !USE_O_CLOEXEC | |
posix_spawn_file_actions_addclose(&actions, pipefds[1]); | |
#endif | |
char *cmd[] = {"wc", "-c", NULL}; | |
pid_t pid; | |
errno = posix_spawnp(&pid, cmd[0], &actions, NULL, cmd, NULL); | |
/* close the read-side of the pipe */ | |
close(pipefds[0]); | |
/* write to the pipe and close */ | |
write(pipefds[1], "hello", 5); | |
close(pipefds[1]); | |
int stat; | |
while (waitpid(pid, &stat, 0) != pid) | |
; | |
return 0; | |
} |
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