std: Add missing C defines for NetBSD

lib/std/c/netbsd.zig

@@ -1,4 +1,6 @@
 const std = @import("../std.zig");
+const builtin = std.builtin;
+
 usingnamespace std.c;
 
 extern "c" fn __errno() *c_int;
@@ -7,6 +9,13 @@ pub const _errno = __errno;
 pub extern "c" fn getdents(fd: c_int, buf_ptr: [*]u8, nbytes: usize) usize;
 pub extern "c" fn sigaltstack(ss: ?*stack_t, old_ss: ?*stack_t) c_int;
 
+pub const dl_iterate_phdr_callback = extern fn (info: *dl_phdr_info, size: usize, data: ?*c_void) c_int;
+pub extern "c" fn dl_iterate_phdr(callback: dl_iterate_phdr_callback, data: ?*c_void) c_int;
+
+pub extern "c" fn __fstat50(fd: fd_t, buf: *Stat) c_int;
+pub extern "c" fn __clock_gettime50(clk_id: c_int, tp: *timespec) c_int;
+pub extern "c" fn __clock_getres50(clk_id: c_int, tp: *timespec) c_int;
+
 pub const pthread_mutex_t = extern struct {
     ptm_magic: c_uint = 0x33330003,
     ptm_errorcheck: padded_spin_t = 0,

lib/std/debug.zig

@@ -654,6 +654,8 @@ pub fn openSelfDebugInfo(allocator: *mem.Allocator) anyerror!DebugInfo {
         switch (builtin.os.tag) {
             .linux,
             .freebsd,
+            .netbsd,
+            .dragonfly,
             .macosx,
             .windows,
             => return DebugInfo.init(allocator),

lib/std/os.zig

@@ -2542,6 +2542,17 @@ pub fn fstat(fd: fd_t) FStatError!Stat {
         }
     }
 
+    if (std.Target.current.os.tag == .netbsd) {
+        switch (errno(system.__fstat50(fd, &stat))) {
+            0 => return stat,
+            EINVAL => unreachable,
+            EBADF => unreachable, // Always a race condition.
+            ENOMEM => return error.SystemResources,
+            EACCES => return error.AccessDenied,
+            else => |err| return unexpectedErrno(err),
+        }
+    }
+
     switch (errno(system.fstat(fd, &stat))) {
         0 => return stat,
         EINVAL => unreachable,
@@ -3401,6 +3412,16 @@ pub fn clock_gettime(clk_id: i32, tp: *timespec) ClockGetTimeError!void {
         }
         return;
     }
+
+    if (std.Target.current.os.tag == .netbsd) {
+        switch (errno(system.__clock_gettime50(clk_id, tp))) {
+            0 => return,
+            EFAULT => unreachable,
+            EINVAL => return error.UnsupportedClock,
+            else => |err| return unexpectedErrno(err),
+        }
+    }
+
     switch (errno(system.clock_gettime(clk_id, tp))) {
         0 => return,
         EFAULT => unreachable,
@@ -3423,6 +3444,15 @@ pub fn clock_getres(clk_id: i32, res: *timespec) ClockGetTimeError!void {
         return;
     }
 
+    if (std.Target.current.os.tag == .netbsd) {
+        switch (errno(system.__clock_getres50(clk_id, res))) {
+            0 => return,
+            EFAULT => unreachable,
+            EINVAL => return error.UnsupportedClock,
+            else => |err| return unexpectedErrno(err),
+        }
+    }
+
     switch (errno(system.clock_getres(clk_id, res))) {
         0 => return,
         EFAULT => unreachable,

lib/std/os/bits/netbsd.zig

@@ -1,9 +1,12 @@
 const std = @import("../../std.zig");
 const maxInt = std.math.maxInt;
 
-pub const fd_t = c_int;
-pub const pid_t = c_int;
-pub const mode_t = c_uint;
+pub const fd_t = i32;
+pub const pid_t = i32;
+pub const mode_t = u32;
+pub const ino_t = u64;
+pub const off_t = i64;
+pub const socklen_t = u32;
 
 /// Renamed from `kevent` to `Kevent` to avoid conflict with function name.
 pub const Kevent = extern struct {
@@ -68,9 +71,6 @@ pub const msghdr_const = extern struct {
     msg_flags: i32,
 };
 
-pub const off_t = i64;
-pub const ino_t = u64;
-
 /// Renamed to Stat to not conflict with the stat function.
 /// atime, mtime, and ctime have functions to return `timespec`,
 /// because although this is a POSIX API, the layout and names of
@@ -816,6 +816,23 @@ pub fn S_IWHT(m: u32) bool {
     return m & S_IFMT == S_IFWHT;
 }
 
+/// Magic value that specify the use of the current working directory
+/// to determine the target of relative file paths in the openat() and
+/// similar syscalls.
+pub const AT_FDCWD = -100;
+
+/// Check access using effective user and group ID
+pub const AT_EACCESS = 0x0100;
+
+/// Do not follow symbolic links
+pub const AT_SYMLINK_NOFOLLOW = 0x0200;
+
+/// Follow symbolic link
+pub const AT_SYMLINK_FOLLOW = 0x0400;
+
+/// Remove directory instead of file
+pub const AT_REMOVEDIR = 0x0800;
+
 pub const HOST_NAME_MAX = 255;
 
 /// dummy for IP