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tools/nolibc: implement waitpid() in terms of waitid()

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The old wait4() syscall used by waitpid() before is not available everywhere.
Switch to the waitid() syscall which is the new replacement.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Thomas Weißschuh 2025-04-11 11:00:45 +02:00 • committed by Thomas Weißschuh
parent 67fe525e34
commit 0c89abf5ab
1 changed files with 58 additions and 12 deletions
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70
tools/include/nolibc/sys/wait.h
View file

@ -15,6 +15,7 @@
* pid_t wait(int *status);
* pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage);
* 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))
@ -39,18 +40,6 @@ pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage)
return __sysret(sys_wait4(pid, status, options, rusage));
}
static __attribute__((unused))
pid_t waitpid(pid_t pid, int *status, int options)
{
return __sysret(sys_wait4(pid, status, options, NULL));
}
/*
* 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)
{
@ -64,6 +53,63 @@ int waitid(int which, pid_t pid, siginfo_t *infop, int options)
}
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 ret;
switch (info.si_code) {
case 0:
*status = 0;
break;
case CLD_EXITED:
*status = (info.si_status & 0xff) << 8;
break;
case CLD_KILLED:
*status = info.si_status & 0x7f;
break;
case CLD_DUMPED:
*status = (info.si_status & 0x7f) | 0x80;
break;
case CLD_STOPPED:
case CLD_TRAPPED:
*status = (info.si_status << 8) + 0x7f;
break;
case CLD_CONTINUED:
*status = 0xffff;
break;
default:
return -1;
}
return info.si_pid;
}
/* make sure to include all global symbols */
#include "../nolibc.h"