Fix new glibc warnings about warn_unused_result.

ccan/antithread/antithread.c

@@ -11,6 +11,7 @@
 #include "antithread.h"
 #include <ccan/noerr/noerr.h>
 #include <ccan/talloc/talloc.h>
+#include <ccan/read_write_all/read_write_all.h>
 #include <ccan/alloc/alloc.h>
 
 /* FIXME: Valgrind support should be possible for some cases.  Tricky
@@ -290,7 +291,7 @@ struct athread *at_spawn(struct at_pool *pool, void *arg, char *cmdline[])
 		execvp(argv[0], argv);
 
 		err = errno;
-		write(pool->parent_wfd, &err, sizeof(err));
+		write_all(pool->parent_wfd, &err, sizeof(err));
 		exit(1);
 	}
 

ccan/read_write_all/_info.c

+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+/**
+ * read_write_all - read_all and write_all routines.
+ *
+ * Successful read and write calls may only partly complete if a
+ * signal is received or they are not operating on a normal file.
+ *
+ * read_all() and write_all() do the looping for you.
+ *
+ * Example:
+ *	#include <err.h>
+ *	#include <stdio.h>
+ *	#include <unistd.h>
+ *	#include <ccan/read_write_all/read_write_all.h>
+ *
+ *	#define BUFFER_SIZE 10
+ *	int main(int argc, char *argv[])
+ *	{
+ *		char buffer[BUFFER_SIZE+1];
+ *
+ *		if (!read_all(STDIN_FILENO, buffer, BUFFER_SIZE))
+ *			err(1, "Could not read %u characters", BUFFER_SIZE);
+ *		buffer[BUFFER_SIZE] = '\0';
+ *		printf("I read '%.*s'\n", BUFFER_SIZE, buffer);
+ *		return 0;
+ *	}
+ *
+ * Licence: LGPL (2 or any later version)
+ */
+int main(int argc, char *argv[])
+{
+	if (argc != 2)
+		return 1;
+
+	if (strcmp(argv[1], "depends") == 0) {
+		return 0;
+	}
+
+	return 1;
+}

ccan/read_write_all/read_write_all.c

+#include "read_write_all.h"
+#include <unistd.h>
+#include <errno.h>
+
+bool write_all(int fd, const void *data, size_t size)
+{
+	while (size) {
+		ssize_t done;
+
+		done = write(fd, data, size);
+		if (done < 0 && errno == EINTR)
+			continue;
+		if (done <= 0)
+			return false;
+		data += done;
+		size -= done;
+	}
+
+	return true;
+}
+
+bool read_all(int fd, void *data, size_t size)
+{
+	while (size) {
+		ssize_t done;
+
+		done = read(fd, data, size);
+		if (done < 0 && errno == EINTR)
+			continue;
+		if (done <= 0)
+			return false;
+		data += done;
+		size -= done;
+	}
+
+	return true;
+}
+

ccan/read_write_all/read_write_all.h

+#ifndef _CCAN_READ_WRITE_H
+#define _CCAN_READ_WRITE_H
+#include <stddef.h>
+#include <stdbool.h>
+
+bool write_all(int fd, const void *data, size_t size);
+bool read_all(int fd, void *data, size_t size);
+
+#endif /* _CCAN_READ_WRITE_H */

ccan/tap/tap.c

@@ -105,7 +105,8 @@ _gen_result(int ok, const char *func, char *file, unsigned int line,
 	   expansions on it */
 	if(test_name != NULL) {
 		va_start(ap, test_name);
-		vasprintf(&local_test_name, test_name, ap);
+		if (vasprintf(&local_test_name, test_name, ap) < 0)
+			local_test_name = NULL;
 		va_end(ap);
 
 		/* Make sure the test name contains more than digits
@@ -363,7 +364,8 @@ skip(unsigned int n, char *fmt, ...)
 	LOCK;
 
 	va_start(ap, fmt);
-	vasprintf(&skip_msg, fmt, ap);
+	if (vasprintf(&skip_msg, fmt, ap) < 0)
+		skip_msg = NULL;
 	va_end(ap);
 
 	while(n-- > 0) {
@@ -386,7 +388,8 @@ todo_start(char *fmt, ...)
 	LOCK;
 
 	va_start(ap, fmt);
-	vasprintf(&todo_msg, fmt, ap);
+	if (vasprintf(&todo_msg, fmt, ap) < 0)
+		todo_msg = NULL;
 	va_end(ap);
 
 	todo = 1;