29346ab043
This patch adds support for the wait4 system call, and with that the wait3 call as well. The implementation is absolutely minimal: only user and system times of the exited child are returned (with all other rusage fields left zero), and there is no support for tracers. Still, this should cover the main use cases of wait4. Change-Id: I7a04589a8423a23990ab39aa38e85d535556743a
27 lines
523 B
C
27 lines
523 B
C
#include <sys/cdefs.h>
|
|
#include <lib.h>
|
|
#include "namespace.h"
|
|
|
|
#include <string.h>
|
|
#include <sys/wait.h>
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(wait4, __wait450)
|
|
#endif
|
|
|
|
pid_t
|
|
wait4(pid_t pid, int * status, int options, struct rusage * rusage)
|
|
{
|
|
message m;
|
|
|
|
memset(&m, 0, sizeof(m));
|
|
m.m_lc_pm_wait4.pid = pid;
|
|
m.m_lc_pm_wait4.options = options;
|
|
m.m_lc_pm_wait4.addr = (vir_bytes)rusage;
|
|
|
|
if (_syscall(PM_PROC_NR, PM_WAIT4, &m) < 0) return(-1);
|
|
|
|
if (status != NULL) *status = m.m_pm_lc_wait4.status;
|
|
return m.m_type;
|
|
}
|