[newlib-cygwin] Cygwin: testsuite: test signal mask and ignore options.

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d33a13e5c167b4758c0d09807d84012b58269af3

commit d33a13e5c167b4758c0d09807d84012b58269af3
Author: Jeremy Drake <[email protected]>
Date:   Thu Jun 19 10:22:52 2025 -0700

    Cygwin: testsuite: test signal mask and ignore options.
    
    Test both that SIG_IGN and sigprocmask are inherited by default, and
    that posix_spawnattr options can prevent this.
    
    Signed-off-by: Jeremy Drake <[email protected]>

Diff:
---
 winsup/testsuite/Makefile.am                      |  1 +
 winsup/testsuite/winsup.api/posix_spawn/signals.c | 82 +++++++++++++++++++++++
 winsup/testsuite/winsup.api/posix_spawn/test.h    | 10 +++
 3 files changed, 93 insertions(+)

diff --git a/winsup/testsuite/Makefile.am b/winsup/testsuite/Makefile.am
index 1cda72905..b92532e4f 100644
--- a/winsup/testsuite/Makefile.am
+++ b/winsup/testsuite/Makefile.am
@@ -312,6 +312,7 @@ check_PROGRAMS = \
 	winsup.api/pthread/threadidafterfork \
 	winsup.api/pthread/tsd1 \
 	winsup.api/posix_spawn/errors \
+	winsup.api/posix_spawn/signals \
 	winsup.api/posix_spawn/spawnp \
 	winsup.api/samples/sample-fail \
 	winsup.api/samples/sample-pass
diff --git a/winsup/testsuite/winsup.api/posix_spawn/signals.c b/winsup/testsuite/winsup.api/posix_spawn/signals.c
new file mode 100644
index 000000000..f64404ddc
--- /dev/null
+++ b/winsup/testsuite/winsup.api/posix_spawn/signals.c
@@ -0,0 +1,82 @@
+#include "test.h"
+#include <signal.h>
+#include <spawn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int handle_child (char *arg)
+{
+  struct sigaction sa;
+  sigset_t mask;
+  int ret;
+
+  negError (sigaction (SIGUSR1, NULL, &sa));
+  negError (sigprocmask (SIG_SETMASK, NULL, &mask));
+  negError (ret = sigismember (&mask, SIGUSR2));
+
+  if (!strcmp (arg, "inherited"))
+    {
+      testAssert (sa.sa_handler == SIG_IGN);
+      testAssertMsg (ret, "SIGUSR2 not masked");
+    }
+  else
+    {
+      testAssert (sa.sa_handler == SIG_DFL);
+      testAssertMsg (!ret, "SIGUSR2 masked");
+    }
+
+  return 0;
+}
+
+int main (int argc, char **argv)
+{
+  posix_spawnattr_t sa;
+  pid_t pid;
+  int status;
+  sigset_t sigusr1mask, sigusr2mask, emptymask;
+  char *childargv[] = {"signal", "--child", "inherited", NULL};
+
+  /* unbuffer stdout */
+  setvbuf(stdout, NULL, _IONBF, 0);
+
+  if (argc == 3 && !strcmp (argv[1], "--child"))
+    return handle_child (argv[2]);
+
+  negError (sigemptyset (&sigusr1mask));
+  negError (sigaddset (&sigusr1mask, SIGUSR1));
+  negError (sigemptyset (&sigusr2mask));
+  negError (sigaddset (&sigusr2mask, SIGUSR2));
+  negError (sigemptyset (&emptymask));
+
+  /* set all signals to default */
+  for (int i = 1; i < NSIG; ++i)
+    if (i != SIGKILL && i != SIGSTOP)
+      signal (i, SIG_DFL);
+
+  /* change some signal states to test signal-related posix_spawn flags */
+  sigError (signal (SIGUSR1, SIG_IGN));
+  negError (sigprocmask (SIG_SETMASK, &sigusr2mask, NULL));
+
+  /* ensure ignored and blocked signals are inherited by default */
+  errCode (posix_spawn (&pid, MYSELF, NULL, NULL, childargv, environ));
+  negError (waitpid (pid, &status, 0));
+  exitStatus (status, 0);
+
+  errCode (posix_spawnattr_init (&sa));
+  errCode (posix_spawnattr_setsigmask (&sa, &emptymask));
+  errCode (posix_spawnattr_setsigdefault (&sa, &sigusr1mask));
+  errCode (posix_spawnattr_setflags (&sa,
+	POSIX_SPAWN_SETSIGDEF|POSIX_SPAWN_SETSIGMASK));
+
+  /* ensure setsigmask and setsigdefault work */
+  childargv[2] = "spawnattr";
+  errCode (posix_spawn (&pid, MYSELF, NULL, &sa, childargv, environ));
+  negError (waitpid (pid, &status, 0));
+  exitStatus (status, 0);
+
+  errCode (posix_spawnattr_destroy (&sa));
+
+  return 0;
+}
diff --git a/winsup/testsuite/winsup.api/posix_spawn/test.h b/winsup/testsuite/winsup.api/posix_spawn/test.h
index e10b6ce5e..531d11c4d 100644
--- a/winsup/testsuite/winsup.api/posix_spawn/test.h
+++ b/winsup/testsuite/winsup.api/posix_spawn/test.h
@@ -34,5 +34,15 @@
 		   "child exited with code %d", WEXITSTATUS ((status))); \
 } while (0)
 
+/* first vararg to testAssertMsg must be string msg */
+#define testAssertMsg(cond, ...) do { \
+  if (!(cond)) \
+    error_at_line (1, 0, __FILE__, __LINE__, __VA_ARGS__); \
+} while (0);
+
+#define testAssert(cond) testAssertMsg(cond, "%s", #cond)
+
+#define MYSELF "/proc/self/exe"
+
 #endif /* _POSIX_SPAWN_TEST_H_ */