explain_getgrouplist_or_die(3)

NAME
explain_getgrouplist_or_die - get list of groups and report errors

SYNOPSIS
#include <libexplain/getgrouplist.h>

void explain_getgrouplist_or_die(const char *user, gid_t group, gid_t *groups, int *ngroups);
int explain_getgrouplist_on_error(const char *user, gid_t group, gid_t *groups, int *ngroups);

DESCRIPTION
The explain_getgrouplist_or_die function is used to call the getgrouplist(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_getgrouplist(3) function, and then the process terminates by calling exit(EXIT_FAILURE).

The explain_getgrouplist_on_error function is used to call the getgrouplist(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_getgrouplist(3) function, but still returns to the caller.

user
    The user, exactly as to be passed to the getgrouplist(3) system call.

group
    The group, exactly as to be passed to the getgrouplist(3) system call.

groups
    The groups, exactly as to be passed to the getgrouplist(3) system call.

ngroups
    The ngroups, exactly as to be passed to the getgrouplist(3) system call.

RETURN VALUE
The explain_getgrouplist_or_die function only returns on success, see getgrouplist(3) for more information. On failure, prints an explanation and exits, it does not return.

The explain_getgrouplist_on_error function always returns the value return by the wrapped getgrouplist(3) system call.

EXAMPLE
The explain_getgrouplist_or_die function is intended to be used in a fashion similar to the following example:
    explain_getgrouplist_or_die(user, group, groups, ngroups);

SEE ALSO

getgrouplist(3)
    get list of groups to which a user belongs

explain_getgrouplist(3)
    explain getgrouplist(3) errors

exit(2)
    terminate the calling process

COPYRIGHT
libexplain version
Copyright (C) 2013 Peter Miller