posix: add package

core/sys/posix/ulimit.odin

@@ -0,0 +1,43 @@
+package posix
+
+import "core:c"
+
+when ODIN_OS == .Darwin {
+	foreign import lib "system:System.framework"
+} else {
+	foreign import lib "system:c"
+}
+
+// ulimit.h - ulimit commands
+
+foreign lib {
+	/*
+	Control process limits.
+
+	Note that -1 is a valid return value, applications should clear errno, do this call and then
+	check both -1 and the errno to determine status.
+
+	Returns: -1 (setting errno) on failure.
+
+	[[ More; https://pubs.opengroup.org/onlinepubs/9699919799/functions/ulimit.html ]]
+	*/
+	ulimit :: proc(i: c.int, #c_vararg arg: ..c.long) -> c.long ---
+}
+
+Ulimit_Cmd :: enum c.int {
+	// Returns the file size limit of the process in units of 512-byte blocks inherited by children.
+	GETFSIZE = UL_GETFSIZE,
+	// Set the file size limit for output operations, taken as a long, multiplied by 512.
+	SETFSIZE = UL_SETFSIZE,
+}
+
+when ODIN_OS == .Darwin || ODIN_OS == .FreeBSD || ODIN_OS == .NetBSD || ODIN_OS == .OpenBSD {
+
+	UL_GETFSIZE :: 1
+	UL_SETFSIZE :: 2
+
+	// NOTE: I don't think OpenBSD implements this API.
+
+} else {
+	#panic("posix is unimplemented for the current target")
+}