github.com/afumu/libc@v0.0.6/musl/src/signal/killpg.c (about)

     1  #include <signal.h>
     2  #include <errno.h>
     3  
     4  int killpg(pid_t pgid, int sig)
     5  {
     6  	if (pgid < 0) {
     7  		errno = EINVAL;
     8  		return -1;
     9  	}
    10  	return kill(-pgid, sig);
    11  }