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Man Pages


Manual Reference Pages  -  EXPLAIN_GETGROUPLIST_OR_DIE (3)

NAME

explain_getgrouplist_or_die - get list of groups and report errors
"get list of groups to which a user belongs and report errors"

CONTENTS

Synopsis
Description
Return Value
Example
See Also
Copyright

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

The B]explain_getgrouplist_on_error function is used to call the I]getgrouplist(3) system call. On failure an explanation will be printed to I]stderr, obtained from the I]explain_getgrouplist(3) function, but still returns to the caller.
I]user The user, exactly as to be passed to the I]getgrouplist(3) system call.
I]group The group, exactly as to be passed to the I]getgrouplist(3) system call.
I]groups The groups, exactly as to be passed to the I]getgrouplist(3) system call.
I]ngroups
  The ngroups, exactly as to be passed to the I]getgrouplist(3) system call.

RETURN VALUE

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

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

EXAMPLE

The B]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

I]getgrouplist(3)
  get list of groups to which a user belongs
I]explain_getgrouplist(3)
  explain I]getgrouplist(3) errors
I]exit(2) terminate the calling process

COPYRIGHT

libexplain version 1.3
Copyright © 2013 Peter Miller
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