initgroups(3) - Linux man page
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)