From d0d6647fdbfbe1a5764c2624e46eee35052d0da6 Mon Sep 17 00:00:00 2001
From: Isaac Freund <ifreund@ifreund.xyz>
Date: Thu, 3 Sep 2020 15:22:43 +0200
Subject: [PATCH] std: add seteuid/setegid to std.os

Currently these are only implemented for linux.
---
 lib/std/os.zig | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/lib/std/os.zig b/lib/std/os.zig
index 3574468a3..8b923989e 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -2512,11 +2512,12 @@ pub fn readlinkatZ(dirfd: fd_t, file_path: [*:0]const u8, out_buffer: []u8) Read
     }
 }
 
-pub const SetIdError = error{
-    ResourceLimitReached,
+pub const SetEidError = error{
     InvalidUserId,
     PermissionDenied,
-} || UnexpectedError;
+};
+
+pub const SetIdError = error{ResourceLimitReached} || SetEidError || UnexpectedError;
 
 pub fn setuid(uid: uid_t) SetIdError!void {
     switch (errno(system.setuid(uid))) {
@@ -2528,6 +2529,15 @@ pub fn setuid(uid: uid_t) SetIdError!void {
     }
 }
 
+pub fn seteuid(uid: uid_t) SetEidError!void {
+    switch (errno(system.seteuid(uid))) {
+        0 => return,
+        EINVAL => return error.InvalidUserId,
+        EPERM => return error.PermissionDenied,
+        else => |err| return unexpectedErrno(err),
+    }
+}
+
 pub fn setreuid(ruid: uid_t, euid: uid_t) SetIdError!void {
     switch (errno(system.setreuid(ruid, euid))) {
         0 => return,
@@ -2548,6 +2558,15 @@ pub fn setgid(gid: gid_t) SetIdError!void {
     }
 }
 
+pub fn setegid(uid: uid_t) SetEidError!void {
+    switch (errno(system.setegid(uid))) {
+        0 => return,
+        EINVAL => return error.InvalidUserId,
+        EPERM => return error.PermissionDenied,
+        else => |err| return unexpectedErrno(err),
+    }
+}
+
 pub fn setregid(rgid: gid_t, egid: gid_t) SetIdError!void {
     switch (errno(system.setregid(rgid, egid))) {
         0 => return,