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Add set/getuid and set/getgid syscalls

Also my editor may or may not have stripped some whitespace...

--- a/lib/sys/sys+linux-x64.myr

+++ b/lib/sys/sys+linux-x64.myr

@@ -242,7 +242,7 @@

 	const Mprotwr	: mprot = 0x2

 	const Mprotexec	: mprot = 0x4

 	const Mprotrw	: mprot = 0x3 /* convenience */

-	

+

 	/* mmap options */

 	const Mshared	: mopt = 0x1

 	const Mpriv	: mopt = 0x2

@@ -337,7 +337,7 @@

 	const Epollwakeup	: epollevttype = 1 << 29

 	const Epolloneshot	: epollevttype = 1 << 30

 	const Epolledge	: epollevttype = 1 << 31

-	

+

 	/* futex ops */

 	const Futexwait	: futexop = 0

 	const Futexwake	: futexop = 1

@@ -791,7 +791,7 @@

 				tls : byte#, \

 				ctid : pid#, \

 				ptreg : byte#, \

-				fn : void# \	/* we need a raw pointer */ 

+				fn : void# \	/* we need a raw pointer */

 				-> pid)

 	const wait4	: (pid:pid, loc:int32#, opt : int64, usage:rusage#	-> int64)

 	const waitpid	: (pid:pid, loc:int32#, opt : int64	-> int64)

@@ -863,6 +863,12 @@

 	const clock_settime	: (clk : clock, ts : timespec# -> int32)

 	const nanosleep	: (req : timespec#, rem : timespec# -> int32)

+	/* user/group management */

+	const getuid : ( -> uint32)

+	const getgid : ( -> uint32)

+	const setuid : (uid : uint32 -> int32)

+	const setgid : (gid : uint32 -> int32)

+

 	/* system information */

 	const uname 	: (buf : utsname# -> int)

@@ -870,7 +876,7 @@

 	extern var __cenvp : byte##

 ;;

-/* 

+/*

 wraps a syscall argument, converting it to 64 bits for the syscall function.

 This is the same as casting, but more concise than writing a cast to int64.

 */

@@ -922,7 +928,7 @@

 	/*

 	 copy the env.

 	 of course we fucking have to duplicate this code everywhere,

-	 since we want to stack allocate... 

+	 since we want to stack allocate...

 	*/

 	ep = alloca((env.len + 1)*sizeof(byte#))

 	cenv = (ep : byte##)[:env.len]

@@ -1005,6 +1011,12 @@

 const clock_gettime = {clk, ts;	-> (syscall(Sysclock_gettime, clockid(clk), a(ts)) : int32)}

 const clock_settime = {clk, ts;	-> (syscall(Sysclock_settime, clockid(clk), a(ts)) : int32)}

 const nanosleep	= {req, rem;	-> (syscall(Sysnanosleep, a(req), a(rem)) : int32)}

+

+/* user/group management */

+const getuid = {; -> (syscall(Sysgetuid) : uint32)}

+const getgid = {; -> (syscall(Sysgetgid) : uint32)}

+const setuid = {uid; -> (syscall(Syssetuid, a(uid)) : int32)}

+const setgid = {gid; -> (syscall(Syssetgid, a(gid)) : int32)}

 /* system information */

 const uname	= {buf;	-> (syscall(Sysuname, buf) : int)}