Provided by: libexplain-dev_1.4.D001-8_amd64
explain_getpgid_or_die - get process group and report errors
#include <libexplain/getpgid.h> 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. pid The pid, exactly as to be passed to the getpgid(2) system call.
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);
getpgid(2) get process group explain_getpgid(3) explain getpgid(2) errors exit(2) terminate the calling process
libexplain version 1.4 Copyright (C) 2011 Peter Miller explain_getpgid_or_die(3)