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| .TH GROUP_MEMBER 3 2014-03-30 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| group_member \- test whether a process is in a group |
| .SH SYNOPSIS |
| .B #include <unistd.h> |
| .sp |
| .BI "int group_member(gid_t " gid ); |
| .sp |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .sp |
| .BR group_member (): |
| _GNU_SOURCE |
| .SH DESCRIPTION |
| The |
| .BR group_member () |
| function tests whether any of the caller's supplementary group IDs |
| (as returned by |
| .BR getgroups (2)) |
| matches |
| .IR gid . |
| .SH RETURN VALUE |
| The |
| .BR group_member () |
| function returns nonzero if any of the caller's |
| supplementary group IDs matches |
| .IR gid , |
| and zero otherwise. |
| .SH CONFORMING TO |
| This function is a nonstandard GNU extension. |
| .SH SEE ALSO |
| .BR getgid (2), |
| .BR getgroups (2), |
| .BR getgrouplist (3), |
| .BR group (5) |