tools/include/nolibc/sys/wait.h
Source file repositories/reference/linux-study-clean/tools/include/nolibc/sys/wait.h
File Facts
- System
- Linux kernel
- Corpus path
tools/include/nolibc/sys/wait.h- Extension
.h- Size
- 2006 bytes
- Lines
- 106
- Domain
- Support Tooling And Documentation
- Bucket
- tools
- Inferred role
- Support Tooling And Documentation: implementation source
- Status
- source implementation candidate
Why This File Exists
Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
../nolibc.h../arch.h../std.h../types.h
Detected Declarations
function __attribute__function __attribute__function __attribute__function __attribute__
Annotated Snippet
#include "../nolibc.h"
#ifndef _NOLIBC_SYS_WAIT_H
#define _NOLIBC_SYS_WAIT_H
#include "../arch.h"
#include "../std.h"
#include "../types.h"
/*
* pid_t wait(int *status);
* pid_t waitpid(pid_t pid, int *status, int options);
* int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options);
*/
static __attribute__((unused))
int _sys_waitid(int which, pid_t pid, siginfo_t *infop, int options, struct rusage *rusage)
{
return __nolibc_syscall5(__NR_waitid, which, pid, infop, options, rusage);
}
static __attribute__((unused))
int waitid(int which, pid_t pid, siginfo_t *infop, int options)
{
return __sysret(_sys_waitid(which, pid, infop, options, NULL));
}
static __attribute__((unused))
pid_t waitpid(pid_t pid, int *status, int options)
{
int idtype, ret;
siginfo_t info;
pid_t id;
if (pid == INT_MIN) {
SET_ERRNO(ESRCH);
return -1;
} else if (pid < -1) {
idtype = P_PGID;
id = -pid;
} else if (pid == -1) {
idtype = P_ALL;
id = 0;
} else if (pid == 0) {
idtype = P_PGID;
id = 0;
} else {
idtype = P_PID;
id = pid;
}
options |= WEXITED;
ret = waitid(idtype, id, &info, options);
if (ret)
return -1;
switch (info.si_code) {
case 0:
if (status)
*status = 0;
break;
case CLD_EXITED:
if (status)
*status = (info.si_status & 0xff) << 8;
break;
case CLD_KILLED:
if (status)
*status = info.si_status & 0x7f;
break;
case CLD_DUMPED:
if (status)
*status = (info.si_status & 0x7f) | 0x80;
break;
case CLD_STOPPED:
case CLD_TRAPPED:
if (status)
*status = (info.si_status << 8) + 0x7f;
break;
case CLD_CONTINUED:
if (status)
*status = 0xffff;
break;
default:
return -1;
}
return info.si_pid;
}
Annotation
- Immediate include surface: `../nolibc.h`, `../arch.h`, `../std.h`, `../types.h`.
- Detected declarations: `function __attribute__`, `function __attribute__`, `function __attribute__`, `function __attribute__`.
- Atlas domain: Support Tooling And Documentation / tools.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.