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Kernel+LibC: Add sys$waitid(), and make sys$waitpid() wrap it

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sys$waitid() takes an explicit description of whether it's waiting for a single
process with the given PID, all of the children, a group, etc., and returns its
info as a siginfo_t.

It also doesn't automatically imply WEXITED, which clears up the confusion in
the kernel.
This commit is contained in:
Sergey Bugaev 2020-02-05 19:42:43 +03:00 • committed by Andreas Kling
parent a6cb7f759e
commit b3a24d732d
5 changed files with 140 additions and 55 deletions
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47
Libraries/LibC/sys/wait.cpp
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@ -38,7 +38,52 @@ pid_t wait(int* wstatus)
pid_t waitpid(pid_t waitee, int* wstatus, int options)
{
int rc = syscall(SC_waitpid, waitee, wstatus, options);
siginfo_t siginfo;
idtype_t idtype;
id_t id;
if (waitee < -1) {
idtype = P_PGID;
id = -waitee;
} else if (waitee == -1) {
idtype = P_ALL;
id = 0;
} else if (waitee == 0) {
idtype = P_PGID;
id = getgid();
} else {
idtype = P_PID;
id = waitee;
}
int rc = waitid(idtype, id, &siginfo, options | WEXITED);
if (rc < 0)
return rc;
if (wstatus) {
switch (siginfo.si_code) {
case CLD_EXITED:
*wstatus = siginfo.si_status << 8;
break;
case CLD_KILLED:
*wstatus = siginfo.si_status;
break;
case CLD_STOPPED:
*wstatus = siginfo.si_status << 8 | 0x7f;
break;
default:
ASSERT_NOT_REACHED();
}
}
return siginfo.si_pid;
}
int waitid(idtype_t idtype, id_t id, siginfo_t* infop, int options)
{
Syscall::SC_waitid_params params { idtype, id, infop, options };
int rc = syscall(SC_waitid, &params);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
}