diff --git a/src/platform/src/linux/mod.rs b/src/platform/src/linux/mod.rs
index aa7eef7c00bdd2bdd4f323eb190e28a757fb3be6..7025b487575b6ab8939414f0c4d9b43b295a19bd 100644
--- a/src/platform/src/linux/mod.rs
+++ b/src/platform/src/linux/mod.rs
@@ -139,6 +139,22 @@ pub fn rmdir(path: *const c_char) -> c_int {
     e(unsafe { syscall!(UNLINKAT, AT_FDCWD, path, AT_REMOVEDIR) }) as c_int
 }
 
+pub fn setpgid(pid: pid_t, pgid: pid_t) -> c_int {
+    e(unsafe { syscall!(SETPGID, pid, pgid) }) as c_int
+}
+
+pub fn setregid(rgid: gid_t, egid: gid_t) -> c_int {
+    e(unsafe { syscall!(SETREGID, rgid, egid) }) as c_int 
+}
+
+pub fn setreuid(ruid: uid_t, euid: uid_t) -> c_int {
+    e(unsafe { syscall!(SETREUID, ruid, euid) }) as c_int
+}
+
+pub fn unlink(path: *const c_char) -> c_int {
+    e(unsafe { syscall!(UNLINKAT, AT_FDCWD, path, 0) }) as c_int
+}
+
 pub fn write(fildes: c_int, buf: &[u8]) -> ssize_t {
     e(unsafe { syscall!(WRITE, fildes, buf.as_ptr(), buf.len()) }) as ssize_t
 }
diff --git a/src/platform/src/redox/mod.rs b/src/platform/src/redox/mod.rs
index 264042d79ce12f965c363cd3b9cc7d9208a3fa71..0ea4bda2073454a74f9968f0c351413b5471f741 100644
--- a/src/platform/src/redox/mod.rs
+++ b/src/platform/src/redox/mod.rs
@@ -157,6 +157,23 @@ pub fn rmdir(path: *const c_char) -> c_int {
     e(syscall::rmdir(path)) as c_int
 }
 
+pub fn setpgid(pid: pid_t, pgid: pid_t) -> c_int {
+    e(syscall::setpgid(pid as usize, pgid as usize)) as c_int
+}
+
+pub fn setregid(rgid: gid_t, egid: gid_t) -> c_int {
+    e(syscall::setregid(rgid as usize, egid as usize)) as c_int
+}
+
+pub fn setreuid(ruid: uid_t, euid: uid_t) -> c_int {
+    e(syscall::setreuid(ruid as usize, euid as usize)) as c_int
+}
+
+pub fn unlink(path: *const c_char) -> c_int {
+    let path = unsafe { c_str(path) };
+    e(syscall::unlink(path)) as c_int
+}
+
 pub fn write(fd: c_int, buf: &[u8]) -> ssize_t {
     e(syscall::write(fd as usize, buf)) as ssize_t
 }
diff --git a/src/unistd/src/lib.rs b/src/unistd/src/lib.rs
index e83c8a8280f66f38f3c4645d9c597db65841e40a..62912097a14b43e7ce11c158bf5ba029340dfbfb 100644
--- a/src/unistd/src/lib.rs
+++ b/src/unistd/src/lib.rs
@@ -351,7 +351,7 @@ pub extern "C" fn setgid(gid: gid_t) -> c_int {
 
 #[no_mangle]
 pub extern "C" fn setpgid(pid: pid_t, pgid: pid_t) -> c_int {
-    unimplemented!();
+    platform::setpgid(pid, pgid)
 }
 
 #[no_mangle]
@@ -361,12 +361,12 @@ pub extern "C" fn setpgrp() -> pid_t {
 
 #[no_mangle]
 pub extern "C" fn setregid(rgid: gid_t, egid: gid_t) -> c_int {
-    unimplemented!();
+    platform::setregid(rgid, egid)
 }
 
 #[no_mangle]
 pub extern "C" fn setreuid(ruid: uid_t, euid: uid_t) -> c_int {
-    unimplemented!();
+    platform::setreuid(ruid, euid)
 }
 
 #[no_mangle]
@@ -436,7 +436,7 @@ pub extern "C" fn ualarm(useconds: useconds_t, interval: useconds_t) -> useconds
 
 #[no_mangle]
 pub extern "C" fn unlink(path: *const c_char) -> c_int {
-    unimplemented!();
+    platform::unlink(path)
 }
 
 #[no_mangle]