diff --git a/src/unix/bsd/freebsdlike/dragonfly/mod.rs b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
index 865244265f8a5..141b2ad25d156 100644
--- a/src/unix/bsd/freebsdlike/dragonfly/mod.rs
+++ b/src/unix/bsd/freebsdlike/dragonfly/mod.rs
@@ -2,6 +2,7 @@ pub type clock_t = u64;
 pub type ino_t = u64;
 pub type nlink_t = u32;
 pub type blksize_t = i64;
+pub type clockid_t = ::c_ulong;
 
 pub type c_long = i64;
 pub type c_ulong = u64;
@@ -96,23 +97,24 @@ pub const RLIM_NLIMITS: ::rlim_t = 12;
 pub const Q_GETQUOTA: ::c_int = 0x300;
 pub const Q_SETQUOTA: ::c_int = 0x400;
 
-pub const CLOCK_REALTIME: ::c_ulong = 0;
-pub const CLOCK_VIRTUAL: ::c_ulong = 1;
-pub const CLOCK_PROF: ::c_ulong = 2;
-pub const CLOCK_MONOTONIC: ::c_ulong = 4;
-pub const CLOCK_UPTIME: ::c_ulong = 5;
-pub const CLOCK_UPTIME_PRECISE: ::c_ulong = 7;
-pub const CLOCK_UPTIME_FAST: ::c_ulong = 8;
-pub const CLOCK_REALTIME_PRECISE: ::c_ulong = 9;
-pub const CLOCK_REALTIME_FAST: ::c_ulong = 10;
-pub const CLOCK_MONOTONIC_PRECISE: ::c_ulong = 11;
-pub const CLOCK_MONOTONIC_FAST: ::c_ulong = 12;
-pub const CLOCK_SECOND: ::c_ulong = 13;
-pub const CLOCK_THREAD_CPUTIME_ID: ::c_ulong = 14;
-pub const CLOCK_PROCESS_CPUTIME_ID: ::c_ulong = 15;
+pub const CLOCK_REALTIME: clockid_t = 0;
+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_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_MONOTONIC_PRECISE: clockid_t = 11;
+pub const CLOCK_MONOTONIC_FAST: clockid_t = 12;
+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;
 
 extern {
     pub fn mprotect(addr: *mut ::c_void, len: ::size_t, prot: ::c_int)
                     -> ::c_int;
-    pub fn clock_gettime(clk_id: ::c_ulong, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
 }
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 5171735343c1f..ae521f28c51aa 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -3,6 +3,7 @@ pub type clock_t = i32;
 pub type ino_t = u32;
 pub type nlink_t = u16;
 pub type blksize_t = u32;
+pub type clockid_t = ::c_int;
 
 pub type fsblkcnt_t = ::uint64_t;
 pub type fsfilcnt_t = ::uint64_t;
@@ -60,8 +61,20 @@ pub const POSIX_FADV_NOREUSE: ::c_int = 5;
 pub const MADV_PROTECT: ::c_int = 10;
 pub const RUSAGE_THREAD: ::c_int = 1;
 
-pub const CLOCK_REALTIME: ::c_int = 0;
-pub const CLOCK_MONOTONIC: ::c_int = 4;
+pub const CLOCK_REALTIME: clockid_t = 0;
+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_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_MONOTONIC_PRECISE: clockid_t = 11;
+pub const CLOCK_MONOTONIC_FAST: clockid_t = 12;
+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;
 
 extern {
     pub fn __error() -> *mut ::c_int;
@@ -69,7 +82,8 @@ extern {
     pub fn mprotect(addr: *const ::c_void, len: ::size_t, prot: ::c_int)
                     -> ::c_int;
 
-    pub fn clock_gettime(clk_id: ::c_int, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
 
     pub fn posix_fallocate(fd: ::c_int, offset: ::off_t,
                            len: ::off_t) -> ::c_int;
diff --git a/src/unix/bsd/openbsdlike/mod.rs b/src/unix/bsd/openbsdlike/mod.rs
index ebca1ccc01f3e..c772e2e9c72bc 100644
--- a/src/unix/bsd/openbsdlike/mod.rs
+++ b/src/unix/bsd/openbsdlike/mod.rs
@@ -8,6 +8,7 @@ pub type pthread_key_t = ::c_int;
 pub type rlim_t = u64;
 pub type speed_t = ::c_uint;
 pub type tcflag_t = ::c_uint;
+pub type clockid_t = ::c_int;
 
 pub enum timezone {}
 
@@ -258,8 +259,16 @@ pub const _SC_XOPEN_SHM : ::c_int = 30;
 pub const PTHREAD_CREATE_JOINABLE : ::c_int = 0;
 pub const PTHREAD_CREATE_DETACHED : ::c_int = 1;
 
-pub const CLOCK_REALTIME : ::c_int = 0;
-pub const CLOCK_MONOTONIC : ::c_int = 3;
+// http://man.openbsd.org/OpenBSD-current/man2/clock_getres.2
+// The man page says clock_gettime(3) can accept various values as clockid_t but
+// http://fxr.watson.org/fxr/source/kern/kern_time.c?v=OPENBSD;im=excerpts#L161
+// the implementation rejects anything other than the below two
+//
+// http://netbsd.gw.com/cgi-bin/man-cgi?clock_gettime
+// https://github.com/jsonn/src/blob/HEAD/sys/kern/subr_time.c#L222
+// Basically the same goes for NetBSD
+pub const CLOCK_REALTIME: clockid_t = 0;
+pub const CLOCK_MONOTONIC: clockid_t = 3;
 
 pub const RLIMIT_CPU: ::c_int = 0;
 pub const RLIMIT_FSIZE: ::c_int = 1;
@@ -380,8 +389,10 @@ pub const RTLD_GLOBAL: ::c_int = 0x100;
 extern {
     pub fn mincore(addr: *mut ::c_void, len: ::size_t,
                    vec: *mut ::c_char) -> ::c_int;
+    #[cfg_attr(target_os = "netbsd", link_name = "__clock_getres50")]
+    pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
     #[cfg_attr(target_os = "netbsd", link_name = "__clock_gettime50")]
-    pub fn clock_gettime(clk_id: ::c_int, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
     pub fn __errno() -> *mut ::c_int;
     pub fn shm_open(name: *const ::c_char, oflag: ::c_int, mode: ::mode_t)
                     -> ::c_int;
diff --git a/src/unix/notbsd/linux/musl/mod.rs b/src/unix/notbsd/linux/musl/mod.rs
index 1cbfd8f25e57a..cd04d851a5462 100644
--- a/src/unix/notbsd/linux/musl/mod.rs
+++ b/src/unix/notbsd/linux/musl/mod.rs
@@ -148,6 +148,11 @@ pub const TIOCINQ: ::c_ulong = ::FIONREAD;
 pub const RTLD_GLOBAL: ::c_int = 0x100;
 pub const RTLD_NOLOAD: ::c_int = 0x4;
 
+// TODO(#247) Temporarily musl-specific (available since musl 0.9.12 / Linux
+// kernel 3.10).  See also notbsd/mod.rs
+pub const CLOCK_SGI_CYCLE: ::clockid_t = 10;
+pub const CLOCK_TAI: ::clockid_t = 11;
+
 extern {
     pub fn getnameinfo(sa: *const ::sockaddr,
                        salen: ::socklen_t,
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index 4dbad3c33f88f..c2405e3d1b7b6 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -5,6 +5,7 @@ pub type pthread_key_t = ::c_uint;
 pub type speed_t = ::c_uint;
 pub type tcflag_t = ::c_uint;
 pub type loff_t = ::c_longlong;
+pub type clockid_t = ::c_int;
 
 pub enum timezone {}
 
@@ -203,8 +204,20 @@ pub const SIGTRAP: ::c_int = 5;
 pub const PTHREAD_CREATE_JOINABLE: ::c_int = 0;
 pub const PTHREAD_CREATE_DETACHED: ::c_int = 1;
 
-pub const CLOCK_REALTIME: ::c_int = 0;
-pub const CLOCK_MONOTONIC: ::c_int = 1;
+pub const CLOCK_REALTIME: clockid_t = 0;
+pub const CLOCK_MONOTONIC: clockid_t = 1;
+pub const CLOCK_PROCESS_CPUTIME_ID: clockid_t = 2;
+pub const CLOCK_THREAD_CPUTIME_ID: clockid_t = 3;
+pub const CLOCK_MONOTONIC_RAW: clockid_t = 4;
+pub const CLOCK_REALTIME_COARSE: clockid_t = 5;
+pub const CLOCK_MONOTONIC_COARSE: clockid_t = 6;
+pub const CLOCK_BOOTTIME: clockid_t = 7;
+pub const CLOCK_REALTIME_ALARM: clockid_t = 8;
+pub const CLOCK_BOOTTIME_ALARM: clockid_t = 9;
+// TODO(#247) Someday our Travis shall have glibc 2.21 (released in Sep
+// 2014.) See also musl/mod.rs
+// pub const CLOCK_SGI_CYCLE: clockid_t = 10;
+// pub const CLOCK_TAI: clockid_t = 11;
 
 pub const RLIMIT_CPU: ::c_int = 0;
 pub const RLIMIT_FSIZE: ::c_int = 1;
@@ -666,7 +679,8 @@ extern {
     pub fn fdatasync(fd: ::c_int) -> ::c_int;
     pub fn mincore(addr: *mut ::c_void, len: ::size_t,
                    vec: *mut ::c_uchar) -> ::c_int;
-    pub fn clock_gettime(clk_id: ::c_int, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
     pub fn prctl(option: ::c_int, ...) -> ::c_int;
     pub fn pthread_getattr_np(native: ::pthread_t,
                               attr: *mut ::pthread_attr_t) -> ::c_int;
diff --git a/src/unix/solaris/mod.rs b/src/unix/solaris/mod.rs
index 4ad520c8ff01e..a47d1baaaab1b 100644
--- a/src/unix/solaris/mod.rs
+++ b/src/unix/solaris/mod.rs
@@ -1,6 +1,7 @@
 pub type c_char = i8;
 pub type c_long = i64;
 pub type c_ulong = u64;
+pub type clockid_t = ::c_int;
 
 pub type blkcnt_t = i64;
 pub type clock_t = i64;
@@ -540,8 +541,18 @@ pub const PTHREAD_STACK_MIN: ::size_t = 4096;
 
 pub const SIGSTKSZ: ::size_t = 8192;
 
-pub const CLOCK_REALTIME: ::c_int = 3;
-pub const CLOCK_MONOTONIC: ::c_int = 4;
+// https://illumos.org/man/3c/clock_gettime
+// https://github.com/illumos/illumos-gate/
+//   blob/HEAD/usr/src/lib/libc/amd64/sys/__clock_gettime.s
+// clock_gettime(3c) doesn't seem to accept anything other than CLOCK_REALTIME
+// or __CLOCK_REALTIME0
+//
+// https://github.com/illumos/illumos-gate/
+//   blob/HEAD/usr/src/uts/common/sys/time_impl.h
+// Confusing! CLOCK_HIGHRES==CLOCK_MONOTONIC==4
+// __CLOCK_REALTIME0==0 is an obsoleted version of CLOCK_REALTIME==3
+pub const CLOCK_REALTIME: clockid_t = 3;
+pub const CLOCK_MONOTONIC: clockid_t = 4;
 
 pub const RLIMIT_CPU: ::c_int = 0;
 pub const RLIMIT_FSIZE: ::c_int = 1;
@@ -752,7 +763,8 @@ extern {
     pub fn ioctl(fildes: ::c_int, request: ::c_int, ...) -> ::c_int;
     pub fn mprotect(addr: *const ::c_void, len: ::size_t, prot: ::c_int)
                     -> ::c_int;
-    pub fn clock_gettime(clk_id: ::c_int, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
+    pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
     pub fn getnameinfo(sa: *const ::sockaddr,
                        salen: ::socklen_t,
                        host: *mut ::c_char,