diff --git a/src/platform/src/linux/mod.rs b/src/platform/src/linux/mod.rs
index d055989d172f75fc68695eec2a6887d3a75565db..b764d1f74247a9b15bfd5de277508184c3dc573e 100644
--- a/src/platform/src/linux/mod.rs
+++ b/src/platform/src/linux/mod.rs
@@ -115,6 +115,14 @@ pub fn getuid() -> uid_t {
     e(unsafe { syscall!(GETUID) })
 }
 
+pub fn kill(pid: pid_t, sig: c_int) -> c_int {
+    e(unsafe { syscall!(KILL, pid, sig) }) as c_int
+}
+
+pub fn killpg(pgrp: pid_t, sig: c_int) -> c_int {
+    e(unsafe { syscall!(KILL, -(pgrp as isize) as pid_t, sig) }) as c_int
+}
+
 pub fn link(path1: *const c_char, path2: *const c_char) -> c_int {
     e(unsafe { syscall!(LINKAT, AT_FDCWD, path1, AT_FDCWD, path2, 0) }) as c_int
 }
diff --git a/src/platform/src/redox/mod.rs b/src/platform/src/redox/mod.rs
index ea7954ec207760ee2a2a25b3ef755f74ae90cdee..4dfb2b28d4cc2463539faaaf3ad7481c73e70da6 100644
--- a/src/platform/src/redox/mod.rs
+++ b/src/platform/src/redox/mod.rs
@@ -119,6 +119,14 @@ pub fn getuid() -> uid_t {
     e(syscall::getuid()) as pid_t
 }
 
+pub fn kill(pid: pid_t, sig: c_int) -> c_int {
+    e(syscall::kill(pid, sig as usize)) as c_int
+}
+
+pub fn killpg(pgrp: pid_t, sig: c_int) -> c_int {
+    e(syscall::kill(-(pgrp as isize) as pid_t, sig as usize)) as c_int
+}
+
 pub fn link(path1: *const c_char, path2: *const c_char) -> c_int {
     let path1 = unsafe { c_str(path1) };
     let path2 = unsafe { c_str(path2) };
diff --git a/src/signal/src/lib.rs b/src/signal/src/lib.rs
index 052cb13770eb2790ff5d12953652e06ddb42b2fc..031b8e4836cb844c1766b1fb57a5b6e43c235a6a 100644
--- a/src/signal/src/lib.rs
+++ b/src/signal/src/lib.rs
@@ -27,12 +27,12 @@ pub type sigset_t = sys_sigset_t;
 
 #[no_mangle]
 pub extern "C" fn kill(pid: pid_t, sig: c_int) -> c_int {
-    unimplemented!();
+    platform::kill(pid, sig)
 }
 
 #[no_mangle]
 pub extern "C" fn killpg(pgrp: pid_t, sig: c_int) -> c_int {
-    unimplemented!();
+    platform::killpg(pgrp, sig)
 }
 
 #[no_mangle]