Manpages - group_member.3

group_member - test whether a process is in a group

  #include <unistd.h>

  int group_member(gid_t gid);

Feature Test Macro Requirements for glibc (see *feature_test_macros*(7)):

*group_member*():

      _GNU_SOURCE

The *group_member*() function tests whether any of the caller’s supplementary group IDs (as returned by *getgroups*(2)) matches gid.

The *group_member*() function returns nonzero if any of the caller’s supplementary group IDs matches gid, and zero otherwise.

This function is a nonstandard GNU extension.

*getgid*(2), *getgroups*(2), *getgrouplist*(3), *group*(5)

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