wait.h

  1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
  2/*
  3 * wait definitions for NOLIBC
  4 * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
  5 */
  6
  7/* make sure to include all global symbols */
  8#include "../nolibc.h"
  9
 10#ifndef _NOLIBC_SYS_WAIT_H
 11#define _NOLIBC_SYS_WAIT_H
 12
 13#include "../arch.h"
 14#include "../std.h"
 15#include "../types.h"
 16
 17/*
 18 * pid_t wait(int *status);
 19 * pid_t waitpid(pid_t pid, int *status, int options);
 20 * int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options);
 21 */
 22
 23static __attribute__((unused))
 24int sys_waitid(int which, pid_t pid, siginfo_t *infop, int options, struct rusage *rusage)
 25{
 26	return my_syscall5(__NR_waitid, which, pid, infop, options, rusage);
 27}
 28
 29static __attribute__((unused))
 30int waitid(int which, pid_t pid, siginfo_t *infop, int options)
 31{
 32	return __sysret(sys_waitid(which, pid, infop, options, NULL));
 33}
 34
 35
 36static __attribute__((unused))
 37pid_t waitpid(pid_t pid, int *status, int options)
 38{
 39	int idtype, ret;
 40	siginfo_t info;
 41	pid_t id;
 42
 43	if (pid == INT_MIN) {
 44		SET_ERRNO(ESRCH);
 45		return -1;
 46	} else if (pid < -1) {
 47		idtype = P_PGID;
 48		id = -pid;
 49	} else if (pid == -1) {
 50		idtype = P_ALL;
 51		id = 0;
 52	} else if (pid == 0) {
 53		idtype = P_PGID;
 54		id = 0;
 55	} else {
 56		idtype = P_PID;
 57		id = pid;
 58	}
 59
 60	options |= WEXITED;
 61
 62	ret = waitid(idtype, id, &info, options);
 63	if (ret)
 64		return -1;
 65
 66	switch (info.si_code) {
 67	case 0:
 68		if (status)
 69			*status = 0;
 70		break;
 71	case CLD_EXITED:
 72		if (status)
 73			*status = (info.si_status & 0xff) << 8;
 74		break;
 75	case CLD_KILLED:
 76		if (status)
 77			*status = info.si_status & 0x7f;
 78		break;
 79	case CLD_DUMPED:
 80		if (status)
 81			*status = (info.si_status & 0x7f) | 0x80;
 82		break;
 83	case CLD_STOPPED:
 84	case CLD_TRAPPED:
 85		if (status)
 86			*status = (info.si_status << 8) + 0x7f;
 87		break;
 88	case CLD_CONTINUED:
 89		if (status)
 90			*status = 0xffff;
 91		break;
 92	default:
 93		return -1;
 94	}
 95
 96	return info.si_pid;
 97}
 98
 99static __attribute__((unused))
100pid_t wait(int *status)
101{
102	return waitpid(-1, status, 0);
103}
104
105#endif /* _NOLIBC_SYS_WAIT_H */