group_member (3) - Linux Man Pages
group_member: test whether a process is in a group
group_member - test whether a process is in a group
int group_member(gid_t gid);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONThe group_member() function tests whether any of the caller's supplementary group IDs (as returned by getgroups(2)) matches gid.
RETURN VALUEThe group_member() function returns nonzero if any of the caller's supplementary group IDs matches gid, and zero otherwise.
CONFORMING TOThis function is a nonstandard GNU extension.
SEE ALSOgetgid(2), getgroups(2), getgrouplist(3), group(5)
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