INITGROUPSSection: Linux Programmer's Manual (3)
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NAMEinitgroups - initialize the supplementary group access list
#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)):
DESCRIPTIONThe 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.
RETURN VALUEThe initgroups() function returns 0 on success. On error, -1 is returned, and errno is set appropriately.
- Insufficient memory to allocate group information structure.
- The calling process has insufficient privilege. See the underlying system call setgroups(2).
/etc/group group database file
CONFORMING TOSVr4, 4.3BSD.
SEE ALSOgetgroups(2), setgroups(2), credentials(7)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.