NAME¶

initgroups - initialize the supplementary group access list

LIBRARY¶

Standard C library (libc, -lc)

SYNOPSIS¶

#include <sys/types.h>
#include <grp.h>

int initgroups(const char *user, gid_t group);

initgroups():

    Since glibc 2.19:


        _DEFAULT_SOURCE


    glibc 2.19 and earlier:


        _BSD_SOURCE

DESCRIPTION¶

The initgroups() function initializes the group access list by reading the group database /etc/group and using all groups of which user is a member. The additional group group is also added to the list.

The user argument must be non-NULL.

RETURN VALUE¶

The initgroups() function returns 0 on success. On error, -1 is returned, and errno is set to indicate the error.

ERRORS¶

ENOMEM

Insufficient memory to allocate group information structure.

EPERM

The calling process has insufficient privilege. See the underlying system call setgroups(2).

FILES¶

/etc/group

group database file

ATTRIBUTES¶

For an explanation of the terms used in this section, see attributes(7).

STANDARDS¶

None.

HISTORY¶

SVr4, 4.3BSD.

SEE ALSO¶

getgroups(2), setgroups(2), credentials(7)