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//===-- String to integer conversion utils ----------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_SYS_WAIT_WAIT4IMPL_H
#define LLVM_LIBC_SRC_SYS_WAIT_WAIT4IMPL_H
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/error_or.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include <signal.h>
#include <sys/syscall.h> // For syscall numbers.
#include <sys/wait.h>
namespace LIBC_NAMESPACE_DECL {
namespace internal {
// The implementation of wait here is very minimal. We will add more
// functionality and standard compliance in future.
LIBC_INLINE ErrorOr<pid_t> wait4impl(pid_t pid, int *wait_status, int options,
struct rusage *usage) {
#if SYS_wait4
pid = LIBC_NAMESPACE::syscall_impl<pid_t>(SYS_wait4, pid, wait_status,
options, usage);
#elif defined(SYS_waitid)
int idtype = P_PID;
if (pid == -1) {
idtype = P_ALL;
} else if (pid < -1) {
idtype = P_PGID;
pid *= -1;
} else if (pid == 0) {
idtype = P_PGID;
}
options |= WEXITED;
siginfo_t info;
pid = LIBC_NAMESPACE::syscall_impl<pid_t>(SYS_waitid, idtype, pid, &info,
options, usage);
if (pid >= 0)
pid = info.si_pid;
if (wait_status) {
switch (info.si_code) {
case CLD_EXITED:
*wait_status = W_EXITCODE(info.si_status, 0);
break;
case CLD_DUMPED:
*wait_status = info.si_status | WCOREFLAG;
break;
case CLD_KILLED:
*wait_status = info.si_status;
break;
case CLD_TRAPPED:
case CLD_STOPPED:
*wait_status = W_STOPCODE(info.si_status);
break;
case CLD_CONTINUED:
// Set wait_status to a value that the caller can check via WIFCONTINUED.
// glibc has a non-POSIX macro definition __W_CONTINUED for this value.
*wait_status = 0xffff;
break;
default:
*wait_status = 0;
break;
}
}
#else
#error "wait4 and waitid syscalls not available."
#endif
if (pid < 0)
return Error(-pid);
return pid;
}
} // namespace internal
} // namespace LIBC_NAMESPACE_DECL
#endif // LLVM_LIBC_SRC_SYS_WAIT_WAIT4IMPL_H
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