int initgroups(const char *user, gid_t group);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.19:
Glibc 2.19 and earlier:
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.
The user argument must be non-NULL.
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
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|initgroups()||Thread safety||MT-Safe locale|
CONFORMING TOSVr4, 4.3BSD.
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