Add execve() test

examples/exec.c

@@ -14,10 +14,12 @@
 #include "libc/stdio/stdio.h"
 #include "libc/sysv/consts/sig.h"
 
+STATIC_YOINK("strerror");
+
 int main(int argc, char *argv[]) {
   sigset_t ss;
-  if (argc < 3) {
-    fputs("USAGE: EXEC.COM PROG ARGV₀ [ARGV₁...]\n", stderr);
+  if (argc < 2) {
+    fputs("USAGE: EXEC.COM PROG [ARGV₀...]\n", stderr);
     return 1;
   }
 
@@ -26,6 +28,6 @@ int main(int argc, char *argv[]) {
   sigaddset(&ss, SIGPWR);
   sigprocmask(SIG_BLOCK, &ss, 0);
 
-  execv(argv[1], argv + 1);
+  execv(argv[1], argv + 2);
   return 127;
 }

libc/calls/mkntcmdline.c

@@ -60,7 +60,12 @@ textwindows noasan int mkntcmdline(char16_t cmdline[ARG_MAX], const char *prog,
   int slashes, n;
   bool needsquote;
   char16_t cbuf[2];
+  char *ansiargv[2];
   size_t i, j, k, s;
+  if (!argv[0]) {
+    bzero(ansiargv, sizeof(ansiargv));
+    argv = ansiargv;
+  }
   for (arg = prog, k = i = 0; arg; arg = argv[++i]) {
     if (i) APPEND(u' ');
     if ((needsquote = NeedsQuotes(arg))) APPEND(u'"');

libc/intrin/createprocess.greg.c

@@ -44,12 +44,12 @@ CreateProcess(const char16_t *opt_lpApplicationName, char16_t *lpCommandLine,
                             opt_lpCurrentDirectory, lpStartupInfo,
                             opt_out_lpProcessInformation);
   if (!ok) __winerr();
-  NTTRACE(
-      "CreateFile(%#hs, %#hs, %s, %s, %hhhd, %u, %p, %#hs, %p, %p) → %hhhd% m",
-      opt_lpApplicationName, lpCommandLine,
-      DescribeNtSecurityAttributes(opt_lpProcessAttributes),
-      DescribeNtSecurityAttributes(opt_lpThreadAttributes), bInheritHandles,
-      dwCreationFlags, opt_lpEnvironment, opt_lpCurrentDirectory, lpStartupInfo,
-      opt_out_lpProcessInformation, ok);
+  NTTRACE("CreateProcess(%#hs, %#!hs, %s, %s, %hhhd, %u, %p, %#hs, %p, %p) → "
+          "%hhhd% m",
+          opt_lpApplicationName, lpCommandLine,
+          DescribeNtSecurityAttributes(opt_lpProcessAttributes),
+          DescribeNtSecurityAttributes(opt_lpThreadAttributes), bInheritHandles,
+          dwCreationFlags, opt_lpEnvironment, opt_lpCurrentDirectory,
+          lpStartupInfo, opt_out_lpProcessInformation, ok);
   return ok;
 }

libc/nt/process.h

@@ -42,7 +42,7 @@ bool32 CreateProcess(const char16_t *opt_lpApplicationName,
                      const char16_t *opt_lpCurrentDirectory,
                      const struct NtStartupInfo *lpStartupInfo,
                      struct NtProcessInformation *opt_out_lpProcessInformation)
-    paramsnonnull((2, 9));
+    paramsnonnull((9));
 
 uint32_t GetThreadId(int64_t hThread);   /* cf. NT_TID */
 uint32_t GetProcessId(int64_t hProcess); /* cf. NT_PID */

libc/runtime/winmain.greg.c

@@ -251,7 +251,7 @@ __msabi static textwindows wontreturn void WinMainNew(const char16_t *cmdline) {
  * @param hInstance call GetModuleHandle(NULL) from main if you need it
  */
 __msabi textwindows int64_t WinMain(int64_t hInstance, int64_t hPrevInstance,
-                                    const char *lpCmdLine, int nCmdShow) {
+                                    const char *lpCmdLine, int64_t nCmdShow) {
   const char16_t *cmdline;
   extern char os asm("__hostos");
   extern uint64_t ts asm("kStartTsc");

test/libc/calls/execve_test.c

@@ -0,0 +1,49 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/calls.h"
+#include "libc/dce.h"
+#include "libc/log/check.h"
+#include "libc/runtime/runtime.h"
+#include "libc/testlib/testlib.h"
+
+void SetUp(void) {
+  if (getenv("_SUBPROCESS")) {
+    if (!__argv[0]) {
+      exit(0);
+    } else {
+      exit(7);
+    }
+  }
+}
+
+TEST(execve, testWeirdAnsiC89emptyArgv) {
+  char *prog;
+  int pid, ws;
+  if (IsWindows()) return;
+  if (IsOpenbsd()) return;
+  prog = GetProgramExecutableName();
+  ASSERT_NE(-1, (pid = fork()));
+  if (!pid) {
+    execve(prog, (char *const[]){0}, (char *const[]){"_SUBPROCESS=1", 0});
+    _Exit(127);
+  }
+  ASSERT_NE(-1, wait(&ws));
+  EXPECT_TRUE(WIFEXITED(ws));
+  EXPECT_EQ(0, WEXITSTATUS(ws));
+}

test/libc/calls/mkntcmdline_test.c

@@ -25,7 +25,13 @@
 
 char16_t cmdline[ARG_MAX];
 
-TEST(mkntcmdline, emptyArgvList_isEmpty) {
+TEST(mkntcmdline, emptyArgvList_cantBeEmptyOnWindows) {
+  char *argv[] = {NULL};
+  EXPECT_NE(-1, mkntcmdline(cmdline, "foo", argv));
+  EXPECT_STREQ(u"foo", cmdline);
+}
+
+TEST(mkntcmdline, emptyArgvListWithProg_isEmpty) {
   char *argv[] = {NULL};
   EXPECT_NE(-1, mkntcmdline(cmdline, argv[0], argv));
   EXPECT_STREQ(u"", cmdline);