build: Fix build and tests on macOS

This commit addresses several compatibility issues that prevented Wayland
from building and passing its test suite on macOS

Core and Compatibility changes:
- Emulate Linux behavior by explicitly setting O_NONBLOCK on connections
  (fixes blocking sendmsg issues on macOS).
- Fix compilation on platforms missing SOCK_CLOEXEC and MSG_CMSG_CLOEXEC.
- Implement wl_os_socket_peercred() using LOCAL_PEERPID for macOS.
- Ensure availability of struct itimerspec (required for POSIX Timers API).

Test suite fixes:
- Add socketpair_cloexec() wrapper to handle platforms without atomic
  SOCK_CLOEXEC support.
- Add implementation of memrchr() for platforms that do not provide it.
- Implement is_debugger_attached() for macOS to handle test timeouts.
- Fix tests to handle Mach-O binary format (instead of ELF).
- Update egl-symbols-check to support macOS *.dylib Mach-O libraries.

Build system:
- Add meson option 'xml_catalog' to allow specifying custom catalog paths.

Signed-off-by: Martin Lopatář <lopin@dataplex.cz>

tests/client-test.c

@@ -97,7 +97,7 @@ TEST(client_destroy_listener)
 	bool user_data_destroyed = false;
 	int s[2];
 
-	assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, s) == 0);
 	display = wl_display_create();
 	assert(display);
 	client = wl_client_create(display, s[0]);
@@ -184,7 +184,7 @@ TEST(client_destroy_removes_link)
 	struct client_destroy_listener destroy_listener;
 	int s[2];
 
-	assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, s) == 0);
 	display = wl_display_create();
 	assert(display);
 	client = wl_client_create(display, s[0]);

tests/connection-test.c

@@ -48,7 +48,7 @@ setup(int *s)
 {
 	struct wl_connection *connection;
 
-	assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, s) == 0);
 
 	connection = wl_connection_create(s[0], WL_BUFFER_DEFAULT_MAX_SIZE);
 	assert(connection);
@@ -181,8 +181,7 @@ struct marshal_data {
 static void
 setup_marshal_data(struct marshal_data *data)
 {
-	assert(socketpair(AF_UNIX,
-			  SOCK_STREAM | SOCK_CLOEXEC, 0, data->s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, data->s) == 0);
 	data->read_connection = wl_connection_create(data->s[0],
 						     WL_BUFFER_DEFAULT_MAX_SIZE);
 	assert(data->read_connection);
@@ -885,7 +884,7 @@ TEST(request_bogus_size)
 	for (bogus_size = 11; bogus_size >= 0; bogus_size--) {
 		fprintf(stderr, "* bogus size %d\n", bogus_size);
 
-		assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
+		assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, s) == 0);
 		display = wl_display_create();
 		assert(display);
 		client = wl_client_create(display, s[0]);

tests/os-wrappers-test.c

@@ -61,10 +61,12 @@ socket_wrapper(int domain, int type, int protocol)
 {
 	wrapped_calls_socket++;
 
+#ifdef SOCK_CLOEXEC
 	if (fall_back && (type & SOCK_CLOEXEC)) {
 		errno = EINVAL;
 		return -1;
 	}
+#endif
 
 	return socket(domain, type, protocol);
 }
@@ -110,10 +112,12 @@ recvmsg_wrapper(int sockfd, struct msghdr *msg, int flags)
 {
 	wrapped_calls_recvmsg++;
 
+#ifdef MSG_CMSG_CLOEXEC
 	if (fall_back && (flags & MSG_CMSG_CLOEXEC)) {
 		errno = EINVAL;
 		return -1;
 	}
+#endif
 
 	return recvmsg(sockfd, msg, flags);
 }
@@ -170,12 +174,14 @@ TEST(os_wrappers_socket_cloexec)
 	do_os_wrappers_socket_cloexec(0);
 }
 
+#ifdef MSG_CMSG_CLOEXEC
 TEST(os_wrappers_socket_cloexec_fallback)
 {
 	/* forced fallback */
 	init_fallbacks(1);
 	do_os_wrappers_socket_cloexec(1);
 }
+#endif
 
 static void
 do_os_wrappers_dupfd_cloexec(int n)
@@ -232,8 +238,7 @@ struct marshal_data {
 static void
 setup_marshal_data(struct marshal_data *data)
 {
-	assert(socketpair(AF_UNIX,
-			  SOCK_STREAM | SOCK_CLOEXEC, 0, data->s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, data->s) == 0);
 
 	data->read_connection = wl_connection_create(data->s[0],
 						     WL_BUFFER_DEFAULT_MAX_SIZE);
@@ -350,11 +355,13 @@ TEST(os_wrappers_recvmsg_cloexec)
 	do_os_wrappers_recvmsg_cloexec(0);
 }
 
+#ifdef MSG_CMSG_CLOEXEC
 TEST(os_wrappers_recvmsg_cloexec_fallback)
 {
 	init_fallbacks(1);
 	do_os_wrappers_recvmsg_cloexec(1);
 }
+#endif
 
 static void
 do_os_wrappers_epoll_create_cloexec(int n)

tests/queue-test.c

@@ -44,6 +44,17 @@
 
 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
 
+#ifdef __APPLE__
+static void *memrchr(const void *s, int c, size_t n) {
+	const unsigned char *p = (const unsigned char *)s;
+	while (n--) {
+		if (p[n] == (unsigned char)c)
+			return (void *)(p + n);
+	}
+	return NULL;
+}
+#endif
+
 static void
 registry_handle_global(void *data, struct wl_registry *registry,
 		       uint32_t id, const char *interface, uint32_t version)

tests/resources-test.c

@@ -40,7 +40,7 @@ TEST(create_resource_tst)
 	int s[2];
 	uint32_t id;
 
-	assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, s) == 0);
 	display = wl_display_create();
 	assert(display);
 	client = wl_client_create(display, s[0]);
@@ -111,7 +111,7 @@ TEST(destroy_res_tst)
 		.notify = &destroy_notify
 	};
 
-	assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, s) == 0);
 	display = wl_display_create();
 	assert(display);
 	client = wl_client_create(display, s[0]);
@@ -159,7 +159,7 @@ TEST(create_resource_with_same_id)
 	int s[2];
 	uint32_t id;
 
-	assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, s) == 0);
 	display = wl_display_create();
 	assert(display);
 	client = wl_client_create(display, s[0]);
@@ -243,7 +243,7 @@ TEST(resource_destroy_iteration)
 		.notify = &resource_destroy_notify
 	};
 
-	assert(socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, s) == 0);
+	assert(socketpair_cloexec(AF_UNIX, SOCK_STREAM, 0, s) == 0);
 	display = wl_display_create();
 	assert(display);
 	client = wl_client_create(display, s[0]);

tests/test-runner.c

@@ -36,9 +36,11 @@
 #include <assert.h>
 #include <dlfcn.h>
 #include <errno.h>
+#include <fcntl.h>
 #include <limits.h>
 #include <signal.h>
 #include <sys/ptrace.h>
+#include <sys/socket.h>
 #ifdef HAVE_SYS_PROCCTL_H
 #include <sys/procctl.h>
 #elif defined(HAVE_SYS_PRCTL_H)
@@ -46,6 +48,8 @@
 #ifndef PR_SET_PTRACER
 # define PR_SET_PTRACER 0x59616d61
 #endif
+#elif defined(__APPLE__)
+#include <sys/sysctl.h>
 #endif
 
 #include "test-runner.h"
@@ -63,7 +67,12 @@ static int timeouts_enabled = 1;
 /* set to one if the output goes to the terminal */
 static int is_atty = 0;
 
+#ifdef __APPLE__
+extern const struct test __start_test_section __asm("section$start$__DATA$test_section");
+extern const struct test __stop_test_section  __asm("section$end$__DATA$test_section");
+#else
 extern const struct test __start_test_section, __stop_test_section;
+#endif
 
 static const struct test *
 find_test(const char *name)
@@ -308,6 +317,22 @@ is_debugger_attached(void)
 
 	return rc;
 }
+#elif defined(__APPLE__)
+static int
+is_debugger_attached(void)
+{
+	int ret;
+	int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid() };
+	struct kinfo_proc info;
+	size_t size;
+
+	info.kp_proc.p_flag = 0;
+	ret = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);
+	assert(ret == 0);
+
+	return (info.kp_proc.p_flag & P_TRACED) != 0;
+}
+
 #else
 static int
 is_debugger_attached(void)
@@ -317,6 +342,43 @@ is_debugger_attached(void)
 }
 #endif
 
+int
+socketpair_cloexec(int domain, int type, int protocol, int sv[2])
+{
+    int flags;
+
+#ifdef SOCK_CLOEXEC
+	if (socketpair(domain, type | SOCK_CLOEXEC, protocol, sv) == 0)
+		return 0;
+	if (errno != EINVAL)
+		return -1;
+#endif
+
+    if (socketpair(domain, type, protocol, sv) < 0)
+        return -1;
+
+    flags = fcntl(sv[0], F_GETFD);
+    if (flags < 0)
+        goto err;
+
+    if (fcntl(sv[0], F_SETFD, flags | FD_CLOEXEC) < 0)
+        goto err;
+
+    flags = fcntl(sv[1], F_GETFD);
+    if (flags < 0)
+        goto err;
+
+    if (fcntl(sv[1], F_SETFD, flags | FD_CLOEXEC) < 0)
+        goto err;
+
+    return 0;
+
+err:
+    close(sv[0]);
+    close(sv[1]);
+    return -1;
+}
+
 int main(int argc, char *argv[])
 {
 	const struct test *t;

tests/test-runner.h

@@ -37,11 +37,17 @@ struct test {
 	int must_fail;
 } __attribute__ ((aligned (16)));
 
+#ifdef __APPLE__
+#define TEST_SECTION "__DATA,test_section"
+#else
+#define TEST_SECTION "test_section"
+#endif
+
 #define TEST(name)							\
 	static void name(void);						\
 									\
 	const struct test test##name					\
-		 __attribute__ ((used, section ("test_section"))) = {	\
+		 __attribute__ ((used, section (TEST_SECTION))) = {	\
 		#name, name, 0						\
 	};								\
 									\
@@ -51,7 +57,7 @@ struct test {
 	static void name(void);						\
 									\
 	const struct test test##name					\
-		 __attribute__ ((used, section ("test_section"))) = {	\
+		 __attribute__ ((used, section (TEST_SECTION))) = {	\
 		#name, name, 1						\
 	};								\
 									\
@@ -86,6 +92,9 @@ test_sleep(unsigned int);
 void
 test_disable_coredumps(void);
 
+int
+socketpair_cloexec(int domain, int type, int protocol, int sv[2]);
+
 #define DISABLE_LEAK_CHECKS				\
 	do {						\
 		extern int fd_leak_check_enabled;	\