diff --git a/libc-test/semver/apple.txt b/libc-test/semver/apple.txt
index 90de2724456a..bd18afc5822f 100644
--- a/libc-test/semver/apple.txt
+++ b/libc-test/semver/apple.txt
@@ -2155,6 +2155,7 @@ shmctl
 shmdt
 shmget
 shmid_ds
+sig_t
 sigevent
 siginfo_t
 sigsuspend
diff --git a/libc-test/semver/dragonfly.txt b/libc-test/semver/dragonfly.txt
index 45e67dc8541e..6a14a615b8bb 100644
--- a/libc-test/semver/dragonfly.txt
+++ b/libc-test/semver/dragonfly.txt
@@ -1667,6 +1667,7 @@ shmctl
 shmdt
 shmget
 shmid_ds
+sig_t
 sigaltstack
 sigevent
 siginfo_t
diff --git a/libc-test/semver/freebsd.txt b/libc-test/semver/freebsd.txt
index 7edf6575d00b..252f7fff4686 100644
--- a/libc-test/semver/freebsd.txt
+++ b/libc-test/semver/freebsd.txt
@@ -2430,6 +2430,7 @@ shmctl
 shmdt
 shmget
 shmid_ds
+sig_t
 sigaltstack
 sigevent
 siginfo_t
diff --git a/libc-test/semver/netbsd.txt b/libc-test/semver/netbsd.txt
index c70af78952e0..1169ec12b012 100644
--- a/libc-test/semver/netbsd.txt
+++ b/libc-test/semver/netbsd.txt
@@ -1598,6 +1598,7 @@ shmctl
 shmdt
 shmget
 shmid_ds
+sig_t
 sigaltstack
 sigevent
 siginfo_t
diff --git a/libc-test/semver/openbsd.txt b/libc-test/semver/openbsd.txt
index bdbf6fb07d46..f7933a856d64 100644
--- a/libc-test/semver/openbsd.txt
+++ b/libc-test/semver/openbsd.txt
@@ -1385,6 +1385,7 @@ shmctl
 shmdt
 shmget
 shmid_ds
+sig_t
 sigaltstack
 siginfo_t
 sigsuspend
diff --git a/src/unix/bsd/apple/mod.rs b/src/unix/bsd/apple/mod.rs
index 8aa5085ad311..376319109ef8 100644
--- a/src/unix/bsd/apple/mod.rs
+++ b/src/unix/bsd/apple/mod.rs
@@ -326,9 +326,11 @@ s! {
         _pad: Padding<[usize; 9]>,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
         // FIXME(union): this field is actually a union
-        pub sa_sigaction: crate::sighandler_t,
+        pub sa_sigaction: crate::sig_t,
         pub sa_mask: sigset_t,
         pub sa_flags: c_int,
     }
diff --git a/src/unix/bsd/freebsdlike/mod.rs b/src/unix/bsd/freebsdlike/mod.rs
index 7d963eabf071..aa680abd097b 100644
--- a/src/unix/bsd/freebsdlike/mod.rs
+++ b/src/unix/bsd/freebsdlike/mod.rs
@@ -156,8 +156,10 @@ s! {
         _pad2: Padding<[c_int; 7]>,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
-        pub sa_sigaction: crate::sighandler_t,
+        pub sa_sigaction: crate::sig_t,
         pub sa_flags: c_int,
         pub sa_mask: sigset_t,
     }
diff --git a/src/unix/bsd/mod.rs b/src/unix/bsd/mod.rs
index 09b6484d3622..e925289796e5 100644
--- a/src/unix/bsd/mod.rs
+++ b/src/unix/bsd/mod.rs
@@ -11,6 +11,7 @@ pub type nfds_t = c_uint;
 pub type regoff_t = c_int;
 #[cfg(not(target_os = "dragonfly"))]
 pub type regoff_t = off_t;
+pub type sig_t = Option<unsafe extern "C" fn(crate::c_int)>;
 
 s! {
     pub struct sockaddr {
diff --git a/src/unix/bsd/netbsdlike/mod.rs b/src/unix/bsd/netbsdlike/mod.rs
index 522039f63b02..1d0db5795052 100644
--- a/src/unix/bsd/netbsdlike/mod.rs
+++ b/src/unix/bsd/netbsdlike/mod.rs
@@ -26,8 +26,10 @@ s! {
         pub sched_priority: c_int,
     }
 
+    // FIXME(1.0): This should not implement `PartialEq`
+    #[allow(unpredictable_function_pointer_comparisons)]
     pub struct sigaction {
-        pub sa_sigaction: crate::sighandler_t,
+        pub sa_sigaction: crate::sig_t,
         pub sa_mask: crate::sigset_t,
         pub sa_flags: c_int,
     }
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 75f7a965ab3a..19ac0bf33bb1 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -1336,8 +1336,24 @@ extern "C" {
     #[cfg_attr(gnu_file_offset_bits64, link_name = "ftruncate64")]
     pub fn ftruncate(fd: c_int, length: off_t) -> c_int;
 
+    #[cfg(not(any(
+        target_vendor = "apple",
+        target_os = "freebsd",
+        target_os = "dragonfly",
+        target_os = "netbsd",
+        target_os = "openbsd"
+    )))]
     pub fn signal(signum: c_int, handler: sighandler_t) -> sighandler_t;
 
+    #[cfg(any(
+        target_vendor = "apple",
+        target_os = "freebsd",
+        target_os = "dragonfly",
+        target_os = "netbsd",
+        target_os = "openbsd"
+    ))]
+    pub fn signal(signum: c_int, handler: sig_t) -> sig_t;
+
     #[cfg_attr(target_os = "netbsd", link_name = "__getrusage50")]
     #[cfg_attr(gnu_time_bits64, link_name = "__getrusage64")]
     #[cfg_attr(musl_redir_time64, link_name = "__getrusage_time64")]