Merge pull request #25820 from GiuseppeCesarano/process

Child.start_suspended ported to posix

Author: alexrp

lib/std/posix.zig

@@ -1699,6 +1699,14 @@ pub fn dup2(old_fd: fd_t, new_fd: fd_t) !void {
     }
 }
 
+pub fn getpid() pid_t {
+    return system.getpid();
+}
+
+pub fn getppid() pid_t {
+    return system.getppid();
+}
+
 pub const ExecveError = error{
     SystemResources,
     AccessDenied,

lib/std/posix/test.zig

@@ -621,6 +621,21 @@ test "dup & dup2" {
     try testing.expectEqualStrings("dupdup2", try tmp.dir.readFile("os_dup_test", &buffer));
 }
 
+test "getpid" {
+    if (native_os == .wasi) return error.SkipZigTest;
+    if (native_os == .windows) return error.SkipZigTest;
+
+    try expect(posix.getpid() != 0);
+}
+
+test "getppid" {
+    if (native_os == .wasi) return error.SkipZigTest;
+    if (native_os == .windows) return error.SkipZigTest;
+    if (native_os == .plan9 and !builtin.link_libc) return error.SkipZigTest;
+
+    try expect(posix.getppid() >= 0);
+}
+
 test "writev longer than IOV_MAX" {
     if (native_os == .windows or native_os == .wasi) return error.SkipZigTest;
 

lib/std/process/Child.zig

@@ -85,8 +85,8 @@ expand_arg0: Arg0Expand,
 /// Darwin-only. Disable ASLR for the child process.
 disable_aslr: bool = false,
 
-/// Darwin and Windows only. Start child process in suspended state. For Darwin it's started
-/// as if SIGSTOP was sent.
+/// Start child process in suspended state.
+/// For Posix systems it's started as if SIGSTOP was sent.
 start_suspended: bool = false,
 
 /// Windows-only. Sets the CREATE_NO_WINDOW flag in CreateProcess.
@@ -669,6 +669,10 @@ fn spawnPosix(self: *ChildProcess) SpawnError!void {
             posix.setpgid(0, pid) catch |err| forkChildErrReport(err_pipe[1], err);
         }
 
+        if (self.start_suspended) {
+            posix.kill(posix.getpid(), .STOP) catch |err| forkChildErrReport(err_pipe[1], err);
+        }
+
         const err = switch (self.expand_arg0) {
             .expand => posix.execvpeZ_expandArg0(.expand, argv_buf.ptr[0].?, argv_buf.ptr, envp),
             .no_expand => posix.execvpeZ_expandArg0(.no_expand, argv_buf.ptr[0].?, argv_buf.ptr, envp),