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71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
#include <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/types.h>
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#include "posix_spawn.h"
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#ifndef OPEN_MAX
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#define OPEN_MAX sysconf(_SC_OPEN_MAX)
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#endif
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MISSING_ENVIRON_DECL;
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int posix_spawn_file_actions_init(posix_spawn_file_actions_t *act)
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{
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act->dups[0] = act->dups[1] = act->dups[2] = -1;
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return 0;
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}
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int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *act, int d, int n)
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{
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/* good faith effort to determine validity of descriptors */
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if (d < 0 || OPEN_MAX < d || n < 0 || OPEN_MAX < n) {
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errno = EBADF;
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return -1;
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}
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/* we only support duplication to 0,1,2 */
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if (2 < n) {
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errno = EINVAL;
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return -1;
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}
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act->dups[n] = d;
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return 0;
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}
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int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *act)
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{
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return 0;
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}
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int posix_spawnp(pid_t *restrict ppid,
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const char *restrict path,
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const posix_spawn_file_actions_t *act,
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const posix_spawnattr_t *restrict attrp,
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char *const argv[restrict],
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char *const envp[restrict])
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{
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if (!ppid || !path || !argv || !envp)
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return EINVAL;
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if (attrp)
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return EINVAL;
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switch (*ppid = fork()) {
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case -1: return -1;
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default: return 0;
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case 0:
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if (act) {
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int i;
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for (i = 0; i < 3; i++)
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if (act->dups[i] != -1 && -1 == dup2(act->dups[i], i))
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_exit(111);
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}
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environ = (char **)envp;
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execvp(path, argv);
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_exit(111);
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/*NOTREACHED*/
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}
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}
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