Tests for read_write_all.

ccan/read_write_all/test/run-read_all.c

+/* FIXME: Do something tricky to ensure we really do loop in read_all. */
+
+#include "read_write_all/read_write_all.h"
+#include "read_write_all/read_write_all.c"
+#include "tap/tap.h"
+#include <unistd.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <limits.h>
+#include <err.h>
+#include <stdlib.h>
+#include <string.h>
+
+static volatile int sigcount;
+static int p2c[2], c2p[2];
+static void got_signal(int sig)
+{
+	char c = 0;
+	if (write(p2c[1], &c, 1) == 1)
+		sigcount++;
+}
+
+/* < PIPE_BUF *will* be atomic.  But > PIPE_BUF only *might* be non-atomic. */
+#define BUFSZ (1024*1024)
+
+int main(int argc, char *argv[])
+{
+	char buffer[BUFSZ*2] = { 0 };
+	char c = 0;
+	int status;
+	pid_t child;
+
+	plan_tests(6);
+
+	/* We fork and torture parent. */
+	if (pipe(p2c) != 0 || pipe(c2p) != 0)
+		err(1, "pipe");
+	child = fork();
+
+	if (!child) {
+		/* Child.  Make sure parent ready, then write in two parts. */
+		if (read(p2c[0], &c, 1) != 1)
+			exit(1);
+		memset(buffer, 0xff, sizeof(buffer));
+		if (!write_all(c2p[1], buffer, BUFSZ))
+			exit(2);
+		if (kill(getppid(), SIGUSR1) != 0)
+			exit(3);
+		/* Make sure they get signal. */
+		if (read(p2c[0], &c, 1) != 1)
+			exit(4);
+		if (write(c2p[1], buffer, PIPE_BUF) != PIPE_BUF)
+			exit(5);
+		exit(0);
+	}
+	if (child == -1)
+		err(1, "forking");
+
+	signal(SIGUSR1, got_signal);
+	ok1(write(p2c[1], &c, 1) == 1);
+	ok1(read_all(c2p[0], buffer, sizeof(buffer)));
+	ok1(memchr(buffer, 0, sizeof(buffer)) == NULL);
+	ok1(sigcount == 1);
+	ok1(wait(&status) == child);
+	ok(WIFEXITED(status) && WEXITSTATUS(status) == 0,
+	   "WIFEXITED(status) = %u, WEXITSTATUS(status) = %u",
+	   WIFEXITED(status), WEXITSTATUS(status));
+	return exit_status();
+}

ccan/read_write_all/test/run-write_all.c

+/* FIXME: Do something tricky to ensure we really do loop in write_all. */
+
+#include "read_write_all/read_write_all.h"
+#include "read_write_all/read_write_all.c"
+#include "tap/tap.h"
+#include <unistd.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <limits.h>
+#include <sys/wait.h>
+#include <err.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+static volatile int sigcount;
+static void got_signal(int sig)
+{
+	sigcount++;
+}
+
+/* < PIPE_BUF *will* be atomic.  But > PIPE_BUF only *might* be non-atomic. */
+#define BUFSZ (1024*1024)
+
+int main(int argc, char *argv[])
+{
+	char buffer[BUFSZ*2] = { 0 };
+	int p2c[2];
+	int status;
+	pid_t child;
+
+	plan_tests(4);
+
+	/* We fork and torture parent. */
+	if (pipe(p2c) != 0)
+		err(1, "pipe");
+	child = fork();
+
+	if (!child) {
+		/* Make sure they started writing. */
+		if (read(p2c[0], buffer, 1) != 1)
+			exit(1);
+		if (kill(getppid(), SIGUSR1) != 0)
+			exit(2);
+		if (!read_all(p2c[0], buffer+1, sizeof(buffer)-1))
+			exit(3);
+		if (memchr(buffer, 0, sizeof(buffer))) {
+			fprintf(stderr, "buffer has 0 at offset %i\n",
+				memchr(buffer, 0, sizeof(buffer)) - (void *)buffer);
+			exit(4);
+		}
+		exit(0);
+	}
+	if (child == -1)
+		err(1, "forking");
+
+	memset(buffer, 0xff, sizeof(buffer));
+	signal(SIGUSR1, got_signal);
+	ok1(write_all(p2c[1], buffer, sizeof(buffer)));
+	ok1(sigcount == 1);
+	ok1(wait(&status) == child);
+	ok(WIFEXITED(status) && WEXITSTATUS(status) == 0,
+	   "WIFEXITED(status) = %u, WEXITSTATUS(status) = %u",
+	   WIFEXITED(status), WEXITSTATUS(status));
+	return exit_status();
+}