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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <assert.h>
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#include <sys/wait.h>
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#include <syscall.h>
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#include <unistd.h>
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extern "C" {
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pid_t wait(int* wstatus)
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{
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return waitpid(-1, wstatus, 0);
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}
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pid_t waitpid(pid_t waitee, int* wstatus, int options)
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{
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siginfo_t siginfo;
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idtype_t idtype;
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id_t id;
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if (waitee < -1) {
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idtype = P_PGID;
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id = -waitee;
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} else if (waitee == -1) {
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idtype = P_ALL;
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id = 0;
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} else if (waitee == 0) {
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idtype = P_PGID;
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id = getgid();
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} else {
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idtype = P_PID;
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id = waitee;
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}
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// To be able to detect if a child was found when WNOHANG is set,
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// we need to clear si_pid, which will only be set if it was found.
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siginfo.si_pid = 0;
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int rc = waitid(idtype, id, &siginfo, options | WEXITED);
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if (rc < 0)
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return rc;
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if (wstatus) {
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if ((options & WNOHANG) && siginfo.si_pid == 0) {
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// No child in a waitable state was found. All other fields
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// in siginfo are undefined
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*wstatus = 0;
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return 0;
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}
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switch (siginfo.si_code) {
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case CLD_EXITED:
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*wstatus = siginfo.si_status << 8;
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break;
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case CLD_KILLED:
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*wstatus = siginfo.si_status;
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break;
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case CLD_STOPPED:
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*wstatus = siginfo.si_status << 8 | 0x7f;
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break;
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case CLD_CONTINUED:
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*wstatus = 0;
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return 0; // return 0 if running
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default:
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VERIFY_NOT_REACHED();
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}
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}
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return siginfo.si_pid;
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}
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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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Syscall::SC_waitid_params params { idtype, id, infop, options };
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int rc = syscall(SC_waitid, ¶ms);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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}
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