diff --git a/libc-test/semver/freebsd.txt b/libc-test/semver/freebsd.txt
index 933fea0e63e94..0aec7377d7efb 100644
--- a/libc-test/semver/freebsd.txt
+++ b/libc-test/semver/freebsd.txt
@@ -1027,6 +1027,7 @@ PL_FLAG_SI
 PM_STR
 POLLINIGNEOF
 POLLRDBAND
+POLLRDHUP
 POLLRDNORM
 POLLSTANDARD
 POLLWRBAND
diff --git a/libc-test/semver/illumos.txt b/libc-test/semver/illumos.txt
index d0ef608456d54..8a182b791cb45 100644
--- a/libc-test/semver/illumos.txt
+++ b/libc-test/semver/illumos.txt
@@ -1,3 +1,13 @@
+O_RSYNC
+POLLRDHUP
+POSIX_FADV_DONTNEED
+POSIX_FADV_NOREUSE
+POSIX_FADV_NORMAL
+POSIX_FADV_RANDOM
+POSIX_FADV_SEQUENTIAL
+POSIX_FADV_WILLNEED
+posix_fadvise
+posix_fallocate
 pthread_attr_get_np
 pthread_attr_getstackaddr
 pthread_attr_setstack
diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 3cf1fc1aeeef3..3fbf981888683 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -2830,6 +2830,7 @@ pub const POSIX_FADV_DONTNEED: ::c_int = 4;
 pub const POSIX_FADV_NOREUSE: ::c_int = 5;
 
 pub const POLLINIGNEOF: ::c_short = 0x2000;
+pub const POLLRDHUP: ::c_short = 0x4000;
 
 pub const EVFILT_READ: i16 = -1;
 pub const EVFILT_WRITE: i16 = -2;
diff --git a/src/unix/solarish/illumos.rs b/src/unix/solarish/illumos.rs
index ef3862ee41b34..3b7d850b690db 100644
--- a/src/unix/solarish/illumos.rs
+++ b/src/unix/solarish/illumos.rs
@@ -28,6 +28,8 @@ pub const EFD_SEMAPHORE: ::c_int = 0x1;
 pub const EFD_NONBLOCK: ::c_int = 0x800;
 pub const EFD_CLOEXEC: ::c_int = 0x80000;
 
+pub const POLLRDHUP: ::c_short = 0x4000;
+
 pub const TCP_KEEPIDLE: ::c_int = 34;
 pub const TCP_KEEPCNT: ::c_int = 35;
 pub const TCP_KEEPINTVL: ::c_int = 36;
@@ -56,6 +58,13 @@ pub const SOL_FILTER: ::c_int = 0xfffc;
 
 pub const MADV_PURGE: ::c_int = 9;
 
+pub const POSIX_FADV_NORMAL: ::c_int = 0;
+pub const POSIX_FADV_RANDOM: ::c_int = 1;
+pub const POSIX_FADV_SEQUENTIAL: ::c_int = 2;
+pub const POSIX_FADV_WILLNEED: ::c_int = 3;
+pub const POSIX_FADV_DONTNEED: ::c_int = 4;
+pub const POSIX_FADV_NOREUSE: ::c_int = 5;
+
 pub const B1000000: ::speed_t = 24;
 pub const B1152000: ::speed_t = 25;
 pub const B1500000: ::speed_t = 26;
@@ -96,6 +105,7 @@ extern "C" {
         stackaddr: *mut ::c_void,
     ) -> ::c_int;
 
+    pub fn posix_fadvise(fd: ::c_int, offset: ::off_t, len: ::off_t, advice: ::c_int) -> ::c_int;
     pub fn preadv(fd: ::c_int, iov: *const ::iovec, iovcnt: ::c_int, offset: ::off_t) -> ::ssize_t;
     pub fn pwritev(fd: ::c_int, iov: *const ::iovec, iovcnt: ::c_int, offset: ::off_t)
         -> ::ssize_t;
diff --git a/src/unix/solarish/mod.rs b/src/unix/solarish/mod.rs
index 27f3bf920c116..8439cfc11aabb 100644
--- a/src/unix/solarish/mod.rs
+++ b/src/unix/solarish/mod.rs
@@ -1293,6 +1293,7 @@ pub const O_RDWR: ::c_int = 2;
 pub const O_NDELAY: ::c_int = 0x04;
 pub const O_APPEND: ::c_int = 8;
 pub const O_DSYNC: ::c_int = 0x40;
+pub const O_RSYNC: ::c_int = 0x8000;
 pub const O_CREAT: ::c_int = 256;
 pub const O_EXCL: ::c_int = 1024;
 pub const O_NOCTTY: ::c_int = 2048;
@@ -2832,6 +2833,7 @@ extern "C" {
     #[cfg_attr(target_os = "illumos", link_name = "_globfree_ext")]
     pub fn globfree(pglob: *mut ::glob_t);
 
+    pub fn posix_fallocate(fd: ::c_int, offset: ::off_t, len: ::off_t) -> ::c_int;
     pub fn posix_madvise(addr: *mut ::c_void, len: ::size_t, advice: ::c_int) -> ::c_int;
 
     pub fn shmat(shmid: ::c_int, shmaddr: *const ::c_void, shmflg: ::c_int) -> *mut ::c_void;