std.c add syslog

lib/std/c.zig

@@ -353,6 +353,11 @@ pub extern "c" fn setrlimit(resource: rlimit_resource, rlim: *const rlimit) c_in
 
 pub extern "c" fn fmemopen(noalias buf: ?*c_void, size: usize, noalias mode: [*:0]const u8) ?*FILE;
 
+pub extern "c" fn syslog(priority: c_int, message: [*:0]const u8, ...) void;
+pub extern "c" fn openlog(ident: [*:0]const u8, logopt: c_int, facility: c_int) void;
+pub extern "c" fn closelog() void;
+pub extern "c" fn setlogmask(maskpri: c_int) c_int;
+
 pub const max_align_t = if (std.Target.current.abi == .msvc)
     f64
 else if (std.Target.current.isDarwin())

lib/std/os/bits.zig

@@ -34,3 +34,22 @@ pub const iovec_const = extern struct {
     iov_base: [*]const u8,
     iov_len: usize,
 };
+
+// syslog
+
+/// system is unusable
+pub const LOG_EMERG = 0;
+/// action must be taken immediately
+pub const LOG_ALERT = 1;
+/// critical conditions
+pub const LOG_CRIT = 2;
+/// error conditions
+pub const LOG_ERR = 3;
+/// warning conditions
+pub const LOG_WARNING = 4;
+/// normal but significant condition
+pub const LOG_NOTICE = 5;
+/// informational
+pub const LOG_INFO = 6;
+/// debug-level messages
+pub const LOG_DEBUG = 7;