user: implement mlibc as the libc, finally.

It's finally done.. Signed-off-by: kaguya <vpshinomiya@protonmail.com>
2026-05-02 03:31:49 -04:00
parent 2fa39ad85a
commit 9a9b91c940
2387 changed files with 152741 additions and 315 deletions
@@ -0,0 +1,125 @@
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+#include <errno.h>
+
+#ifdef USE_HOST_LIBC
+#define TEST_PORT 31337
+#else
+#define TEST_PORT 42069
+#endif
+
+static struct sockaddr_in connect_addr, accept_addr;
+static int listen_fd;
+
+int permutations[] = {
+	0,
+	SOCK_CLOEXEC,
+	SOCK_NONBLOCK,
+	SOCK_CLOEXEC | SOCK_NONBLOCK,
+};
+
+static bool run_test(int flags)
+{
+	int connect_fd;
+	int fd_flags, access;
+	socklen_t addrlen;
+
+	connect_fd = socket(AF_INET, SOCK_STREAM, 0);
+	connect(connect_fd, (struct sockaddr *)&connect_addr, sizeof(connect_addr));
+	addrlen = sizeof(accept_addr);
+
+	int accept_fd = accept4(listen_fd, (struct sockaddr *)&accept_addr, &addrlen, flags);
+
+	if(accept_fd == -1) {
+		fprintf(stderr, "accept4 failed: %s\n", strerror(errno));
+		goto cleanup;
+	}
+
+	fd_flags = fcntl(accept_fd, F_GETFD);
+	if(!(!!(fd_flags & FD_CLOEXEC) == !!(flags & SOCK_CLOEXEC))) {
+		fprintf(stderr, "CLOEXEC mismatch, got %d instead of %d\n", !!(fd_flags & FD_CLOEXEC), !!(flags & SOCK_CLOEXEC));
+		goto cleanup;
+	}
+
+	access = fcntl(accept_fd, F_GETFL);
+	if(!(!!(access & O_NONBLOCK) == !!(flags & SOCK_NONBLOCK))) {
+		fprintf(stderr, "NONBLOCK flag mismatch, %d vs %d\n", !!(access & O_NONBLOCK), !!(flags & SOCK_NONBLOCK));
+		goto cleanup;
+	}
+
+	close(accept_fd);
+	close(connect_fd);
+
+	fprintf(stderr, "tested CLOEXEC %d, NONBLOCK %d\n", !!(flags & SOCK_CLOEXEC), !!(flags & SOCK_NONBLOCK));
+	return true;
+
+cleanup:
+	close(accept_fd);
+	close(connect_fd);
+	return false;
+}
+
+static int socket_setup(void)
+{
+	struct sockaddr_in addr;
+	int reuseaddr;
+
+	memset(&addr, 0, sizeof(struct sockaddr_in));
+	addr.sin_family = AF_INET;
+	addr.sin_addr.s_addr = htonl(INADDR_ANY);
+	addr.sin_port = htons(TEST_PORT);
+
+	int socket_fd = socket(AF_INET, SOCK_STREAM, 0);
+
+	if(socket_fd == -1) {
+		fprintf(stderr, "socket failed: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	reuseaddr = 1;
+	int ret = setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, sizeof(reuseaddr));
+
+	if(ret == -1) {
+		fprintf(stderr, "setsockopt failed: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	ret = bind(socket_fd, (struct sockaddr *)&addr, sizeof(struct sockaddr_in));
+
+	if(ret == -1) {
+		fprintf(stderr, "bind failed: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	ret = listen(socket_fd, 5);
+
+	if(ret == -1) {
+		fprintf(stderr, "listen failed: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	return socket_fd;
+}
+
+int main() {
+	memset(&connect_addr, 0, sizeof(connect_addr));
+	connect_addr.sin_family = AF_INET;
+	connect_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	connect_addr.sin_port = htons(TEST_PORT);
+
+	for(size_t i = 0; i < 4; i++) {
+		listen_fd = socket_setup();
+		if(!run_test(permutations[i])) {
+			exit(1);
+		}
+		close(listen_fd);
+	}
+
+	return 0;
+}