|explain_getpgid_or_die(3)||Library Functions Manual||explain_getpgid_or_die(3)|
explain_getpgid_or_die - get process group and report errors
pid_t explain_getpgid_or_die(pid_t pid);
pid_t explain_getpgid_on_error(pid_t pid);
The explain_getpgid_or_die function is used to call the getpgid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_getpgid(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_getpgid_on_error function is used to call the getpgid(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_getpgid(3) function, but still returns to the caller.
The explain_getpgid_or_die function only returns on success, see getpgid(2) for more information. On failure, prints an explanation and exits, it does not return.
The explain_getpgid_on_error function always returns the value return by the wrapped getpgid(2) system call.
The explain_getpgid_or_die function is intended to be used in a fashion similar to the following example:
pid_t result = explain_getpgid_or_die(pid);
libexplain version 1.4
Copyright (C) 2011 Peter Miller