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Name

initgroups - initialize the supplementary group access list

Synopsis


#include <sys/types.h>#include <grp.h>
int initgroups(const char *user, gid_t group);

Feature Test Macro Requirements for glibc (see feature_test_macros(7) ):

initgroups(): _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 appropriately.

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

Conforming to

SVr4, 4.3BSD.

See Also

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

Colophon

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