diff --git a/mod.zig b/mod.zig
index 8fc47a83b94441a74ae86de81f8d7a8a7c0390ea..8515021af2ec3450cde92d7bbc9eb3a716b38817 100644
--- a/mod.zig
+++ b/mod.zig
@@ -659,7 +659,13 @@ pub fn getpgrp() errno.Error!pid_t {
 // setsid
 // pid_t setsid(void);
 // asmlinkage long sys_setsid(void);
-pub const setsid = @compileError("TODO: setsid");
+pub fn setsid() errno.Error!pid_t {
+    const r = syscall0(.setsid);
+    return switch (_errno(r)) {
+        .ok => @intCast(r),
+        _ => |c| errno.errorFromInt(@intFromEnum(c)),
+    };
+}
 
 // setreuid
 // int setreuid(uid_t ruid, uid_t euid);
diff --git a/test.zig b/test.zig
index 337de32f144694c955398fcb9ff93455539f1ce9..478db29e179388c80ac5380be1ba5185621f3876 100644
--- a/test.zig
+++ b/test.zig
@@ -18,4 +18,5 @@ test {
     _ = &linux.getegid;
     _ = &linux.getppid;
     _ = &linux.getpgrp;
+    _ = &linux.setsid;
 }