explain_setpgid_or_die(3) Library Functions Manual explain_setpgid_or_die(3)

explain_setpgid_or_die - set process group and report errors

#include <libexplain/setpgid.h>

void explain_setpgid_or_die(pid_t pid, pid_t pgid);
int explain_setpgid_on_error(pid_t pid, pid_t pgid);

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

The explain_setpgid_on_error function is used to call the setpgid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_setpgid(3) function, but still returns to the caller.

The pid, exactly as to be passed to the setpgid(2) system call.
The pgid, exactly as to be passed to the setpgid(2) system call.

The explain_setpgid_or_die function only returns on success, see setpgid(2) for more information. On failure, prints an explanation and exits, it does not return.

The explain_setpgid_on_error function always returns the value return by the wrapped setpgid(2) system call.

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

explain_setpgid_or_die(pid, pgid);

set process group
explain setpgid(2) errors
terminate the calling process

libexplain version 1.4
Copyright (C) 2011 Peter Miller