OrionLibC

#include <stddef.h>
#include <sys/syscall.h>
#include <sys/types.h>

/* Set the current process' user id */
int
setuid(uid_t uid)
{
	int ret;
	asm volatile("int $0x80" : "=a" (ret) : "0" (SYSCALL_SETUID),
	             "c" (1), "S" (&uid));
	return ret;
}

/* Set the current process' effective user id */
int
seteuid(uid_t euid)
{
	int ret;
	asm volatile("int $0x80" : "=a" (ret) : "0" (SYSCALL_SETEUID),
	             "c" (1), "S" (&euid));
	return ret;
}

/* Set the current process' group id */
int
setgid(gid_t gid)
{
	int ret;
	asm volatile("int $0x80" : "=a" (ret) : "0" (SYSCALL_SETGID),
	             "c" (1), "S" (&gid));
	return ret;
}

/* Set the current process' effective group id */
int
setegid(gid_t egid)
{
	int ret;
	asm volatile("int $0x80" : "=a" (ret) : "0" (SYSCALL_SETEGID),
	             "c" (1), "S" (&egid));
	return ret;
}