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getpgrp() -- System Call (libc)

Get process-group identifier
#include <sys/types.h>
#include <unistd.h>
pid_t getpgrp();

getpgrp() returns  the identifier of  the calling process's  process group.
It always succeeds.

See Also

libc,
types.h,
unistd.h
POSIX Standard, §4.3.1