|explain_getgrent_or_die(3)||Library Functions Manual||explain_getgrent_or_die(3)|
explain_getgrent_or_die - get group file entry and report errors
struct group *explain_getgrent_or_die(void);
struct group *explain_getgrent_on_error(void);
The explain_getgrent_or_die function is used to call the getgrent(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_getgrent(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_getgrent_on_error function is used to call the getgrent(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_getgrent(3) function, but still returns to the caller.
The explain_getgrent_or_die function only returns on success, see getgrent(3) for more information. On failure, prints an explanation and exits, it does not return.
The explain_getgrent_on_error function always returns the value return by the wrapped getgrent(3) system call.
The explain_getgrent_or_die function is intended to be used in a fashion similar to the following example:
struct group *result = explain_getgrent_or_die();
libexplain version 1.4
Copyright (C) 2013 Peter Miller