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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/include/nolibc/sys/wait.h
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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */

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/*

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 * wait definitions for NOLIBC

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 * Copyright (C) 2017-2021 Willy Tarreau <[email protected]>

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 */

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/* make sure to include all global symbols */

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#include "../nolibc.h"

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#ifndef _NOLIBC_SYS_WAIT_H

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#define _NOLIBC_SYS_WAIT_H

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#include "../arch.h"

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#include "../std.h"

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#include "../types.h"

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/*

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 * pid_t wait(int *status);

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 * pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage);

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 * pid_t waitpid(pid_t pid, int *status, int options);

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 * int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options);

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 */

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static __attribute__((unused))

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pid_t sys_wait4(pid_t pid, int *status, int options, struct rusage *rusage)

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{

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#ifdef __NR_wait4

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	return my_syscall4(__NR_wait4, pid, status, options, rusage);

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#else

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	return __nolibc_enosys(__func__, pid, status, options, rusage);

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#endif

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}

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static __attribute__((unused))

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pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage)

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{

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	return __sysret(sys_wait4(pid, status, options, rusage));

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}

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static __attribute__((unused))

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int sys_waitid(int which, pid_t pid, siginfo_t *infop, int options, struct rusage *rusage)

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{

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	return my_syscall5(__NR_waitid, which, pid, infop, options, rusage);

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}

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static __attribute__((unused))

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int waitid(int which, pid_t pid, siginfo_t *infop, int options)

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{

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	return __sysret(sys_waitid(which, pid, infop, options, NULL));

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}

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static __attribute__((unused))

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pid_t waitpid(pid_t pid, int *status, int options)

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{

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	int idtype, ret;

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	siginfo_t info;

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	pid_t id;

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	if (pid == INT_MIN) {

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		SET_ERRNO(ESRCH);

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		return -1;

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	} else if (pid < -1) {

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		idtype = P_PGID;

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		id = -pid;

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	} else if (pid == -1) {

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		idtype = P_ALL;

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		id = 0;

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	} else if (pid == 0) {

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		idtype = P_PGID;

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		id = 0;

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	} else {

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		idtype = P_PID;

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		id = pid;

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	}

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	options |= WEXITED;

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	ret = waitid(idtype, id, &info, options);

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	if (ret)

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		return -1;

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	switch (info.si_code) {

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	case 0:

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		*status = 0;

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		break;

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	case CLD_EXITED:

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		*status = (info.si_status & 0xff) << 8;

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		break;

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	case CLD_KILLED:

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		*status = info.si_status & 0x7f;

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		break;

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	case CLD_DUMPED:

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		*status = (info.si_status & 0x7f) | 0x80;

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		break;

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	case CLD_STOPPED:

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	case CLD_TRAPPED:

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		*status = (info.si_status << 8) + 0x7f;

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		break;

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	case CLD_CONTINUED:

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		*status = 0xffff;

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		break;

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	default:

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		return -1;

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	}

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	return info.si_pid;

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}

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static __attribute__((unused))

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pid_t wait(int *status)

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{

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	return waitpid(-1, status, 0);

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}

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#endif /* _NOLIBC_SYS_WAIT_H */

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