diff options
Diffstat (limited to 'libc-top-half/musl/src/stdio/popen.c')
-rw-r--r-- | libc-top-half/musl/src/stdio/popen.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdio/popen.c b/libc-top-half/musl/src/stdio/popen.c new file mode 100644 index 0000000..3ec8339 --- /dev/null +++ b/libc-top-half/musl/src/stdio/popen.c @@ -0,0 +1,61 @@ +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <spawn.h> +#include "stdio_impl.h" +#include "syscall.h" + +extern char **__environ; + +FILE *popen(const char *cmd, const char *mode) +{ + int p[2], op, e; + pid_t pid; + FILE *f; + posix_spawn_file_actions_t fa; + + if (*mode == 'r') { + op = 0; + } else if (*mode == 'w') { + op = 1; + } else { + errno = EINVAL; + return 0; + } + + if (pipe2(p, O_CLOEXEC)) return NULL; + f = fdopen(p[op], mode); + if (!f) { + __syscall(SYS_close, p[0]); + __syscall(SYS_close, p[1]); + return NULL; + } + + e = ENOMEM; + if (!posix_spawn_file_actions_init(&fa)) { + for (FILE *l = *__ofl_lock(); l; l=l->next) + if (l->pipe_pid && posix_spawn_file_actions_addclose(&fa, l->fd)) + goto fail; + if (!posix_spawn_file_actions_adddup2(&fa, p[1-op], 1-op)) { + if (!(e = posix_spawn(&pid, "/bin/sh", &fa, 0, + (char *[]){ "sh", "-c", (char *)cmd, 0 }, __environ))) { + posix_spawn_file_actions_destroy(&fa); + f->pipe_pid = pid; + if (!strchr(mode, 'e')) + fcntl(p[op], F_SETFD, 0); + __syscall(SYS_close, p[1-op]); + __ofl_unlock(); + return f; + } + } +fail: + __ofl_unlock(); + posix_spawn_file_actions_destroy(&fa); + } + fclose(f); + __syscall(SYS_close, p[1-op]); + + errno = e; + return 0; +} |