Auto merge of #3124 - valpackett:fbsd, r=JohnTitor

FreeBSD: add AT_RESOLVE_BENEATH, Linux-compatible clock aliases

- sorry for the spam xD *now* I should be done with that area of the API…
- +mirror one other thing that [was done](https://reviews.freebsd.org/D30988) in the headers to reduce portability annoyance :)

Author: bors

libc-test/build.rs

@@ -2074,14 +2074,22 @@ fn test_freebsd(target: &str) {
             // These constants were introduced in FreeBSD 13:
             "EFD_CLOEXEC" | "EFD_NONBLOCK" | "EFD_SEMAPHORE" if Some(13) > freebsd_ver => true,
 
-            // This constant was introduced in FreeBSD 12:
-            "O_RESOLVE_BENEATH" if Some(12) > freebsd_ver => true,
+            // These constants were introduced in FreeBSD 12:
+            "AT_RESOLVE_BENEATH" | "O_RESOLVE_BENEATH" if Some(12) > freebsd_ver => true,
 
             // These constants were introduced in FreeBSD 13:
             "O_DSYNC" | "O_PATH" | "O_EMPTY_PATH" | "AT_EMPTY_PATH" if Some(13) > freebsd_ver => {
                 true
             }
 
+            // These aliases were introduced in FreeBSD 13:
+            // (note however that the constants themselves work on any version)
+            "CLOCK_BOOTTIME" | "CLOCK_REALTIME_COARSE" | "CLOCK_MONOTONIC_COARSE"
+                if Some(13) > freebsd_ver =>
+            {
+                true
+            }
+
             // FIXME: These are deprecated - remove in a couple of releases.
             // These constants were removed in FreeBSD 11 (svn r273250) but will
             // still be accepted and ignored at runtime.

libc-test/semver/freebsd.txt

@@ -100,6 +100,7 @@ AT_PHDR
 AT_PHENT
 AT_PHNUM
 AT_REMOVEDIR
+AT_RESOLVE_BENEATH
 AT_SYMLINK_FOLLOW
 AT_SYMLINK_NOFOLLOW
 AT_UID
@@ -148,10 +149,13 @@ CLD_EXITED
 CLD_KILLED
 CLD_STOPPED
 CLD_TRAPPED
+CLOCK_BOOTTIME
+CLOCK_MONOTONIC_COARSE
 CLOCK_MONOTONIC_FAST
 CLOCK_MONOTONIC_PRECISE
 CLOCK_PROCESS_CPUTIME_ID
 CLOCK_PROF
+CLOCK_REALTIME_COARSE
 CLOCK_REALTIME_FAST
 CLOCK_REALTIME_PRECISE
 CLOCK_SECOND

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -3737,6 +3737,7 @@ pub const AT_EACCESS: ::c_int = 0x100;
 pub const AT_SYMLINK_NOFOLLOW: ::c_int = 0x200;
 pub const AT_SYMLINK_FOLLOW: ::c_int = 0x400;
 pub const AT_REMOVEDIR: ::c_int = 0x800;
+pub const AT_RESOLVE_BENEATH: ::c_int = 0x2000;
 pub const AT_EMPTY_PATH: ::c_int = 0x4000;
 
 pub const AT_NULL: ::c_int = 0;

src/unix/bsd/freebsdlike/mod.rs

@@ -824,12 +824,15 @@ pub const CLOCK_VIRTUAL: ::clockid_t = 1;
 pub const CLOCK_PROF: ::clockid_t = 2;
 pub const CLOCK_MONOTONIC: ::clockid_t = 4;
 pub const CLOCK_UPTIME: ::clockid_t = 5;
+pub const CLOCK_BOOTTIME: ::clockid_t = CLOCK_UPTIME;
 pub const CLOCK_UPTIME_PRECISE: ::clockid_t = 7;
 pub const CLOCK_UPTIME_FAST: ::clockid_t = 8;
 pub const CLOCK_REALTIME_PRECISE: ::clockid_t = 9;
 pub const CLOCK_REALTIME_FAST: ::clockid_t = 10;
+pub const CLOCK_REALTIME_COARSE: ::clockid_t = CLOCK_REALTIME_FAST;
 pub const CLOCK_MONOTONIC_PRECISE: ::clockid_t = 11;
 pub const CLOCK_MONOTONIC_FAST: ::clockid_t = 12;
+pub const CLOCK_MONOTONIC_COARSE: ::clockid_t = CLOCK_MONOTONIC_FAST;
 pub const CLOCK_SECOND: ::clockid_t = 13;
 pub const CLOCK_THREAD_CPUTIME_ID: ::clockid_t = 14;
 pub const CLOCK_PROCESS_CPUTIME_ID: ::clockid_t = 15;