get the group ID
#include <sys/types> #include <unistd.h> gid_t getgid( void );
The getgid() function allows the calling process to find out its group ID.
the calling process's group ID. This function cannot fail.
getuid(), geteuid(), getegid()
/* * print out group id of process. */ #include <stdio.h> #include <sys/types.h> #include <unistd.h> void main() { printf( "I belong to group ID %d\n", getgid() ); }
POSIX 1003.1
QNX