setegid.c\unistd\src - musl - musl - an implementation of the standard library for Linux-based systems

#include <unistd.h>
#include "libc.h"
#include "syscall.h"
int setegid(gid_t egid)
{
	return __setxid(SYS_setresgid, -1, egid, -1);
}