explain_wait4_or_die(3)

wait for process to change state and report errors

Section 3 libexplain-dev bookworm source

Description

explain_wait4_or_die

NAME

explain_wait4_or_die - wait for process to change state and report errors

SYNOPSIS

#include <libexplain/wait4.h>
void explain_wait4_or_die(int pid, int *status, int options, struct rusage *rusage);

DESCRIPTION

The explain_wait4_or_die function is used to call the wait4(2) system call. On failure an explanation will be printed to stderr, obtained from explain_wait4(3), and then the process terminates by calling exit(EXIT_FAILURE).

This function is intended to be used in a fashion similar to the following example:

explain_wait4_or_die(pid, status, options, rusage);

	pid		The pid, exactly as to be passed to the wait4(2) system call.
	status		The status, exactly as to be passed to the wait4(2) system call.

options

The options, exactly as to be passed to the wait4(2) system call.

rusage

The rusage, exactly as to be passed to the wait4(2) system call.

Returns:

This function only returns on success, see wait4(2) for more information. On failure, prints an explanation and exits.