libctdb: test: improve logging of failure paths

We include the file and line which called the functions, so the printed
failure path now looks like:

	[malloc(ctdb.c:144)]:1:S[socket(ctdb.c:168)]:1:S...

The form is:
    [ <function> ( <caller> ) ] : <input line> : <result>

<function> is the function which is called (eg. malloc).
<caller> is the file and line number which called <function>.
<input line> is the 1-based line number in the input which we were up to.
<result> is 'S' (success) or 'F' (failure).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>


(This used to be ctdb commit 5fb6da30b5b5a8b761c8ab9a8124b87b759ef055)

ctdb/libctdb/test/ctdb-test.c

@@ -251,7 +251,7 @@ static char *get_cmdline_optstr(void)
 static int ctdb_test_poll(struct pollfd *fds, nfds_t nfds, int timeout,
 			  const char *location)
 {
-	if (should_i_fail("poll")) {
+	if (should_i_fail("poll", location)) {
 		errno = EINVAL;
 		return -1;
 	}
@@ -260,7 +260,7 @@ static int ctdb_test_poll(struct pollfd *fds, nfds_t nfds, int timeout,
 
 static void *ctdb_test_malloc(size_t size, const char *location)
 {
-	if (should_i_fail("malloc")) {
+	if (should_i_fail("malloc", location)) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -274,7 +274,7 @@ static void ctdb_test_free(void *ptr, const char *location)
 
 static void *ctdb_test_realloc(void *ptr, size_t size, const char *location)
 {
-	if (should_i_fail("realloc")) {
+	if (should_i_fail("realloc", location)) {
 		errno = ENOMEM;
 		return NULL;
 	}
@@ -288,7 +288,7 @@ static void *ctdb_test_realloc(void *ptr, size_t size, const char *location)
 static ssize_t ctdb_test_read(int fd, void *buf, size_t count,
 			      const char *location)
 {
-	if (should_i_fail("read")) {
+	if (should_i_fail("read", location)) {
 		errno = EBADF;
 		return -1;
 	}
@@ -305,7 +305,7 @@ static ssize_t ctdb_test_read(int fd, void *buf, size_t count,
 static ssize_t ctdb_test_write(int fd, const void *buf, size_t count,
 			       const char *location)
 {
-	if (should_i_fail("write")) {
+	if (should_i_fail("write", location)) {
 		errno = EBADF;
 		return -1;
 	}
@@ -323,7 +323,7 @@ static ssize_t ctdb_test_write(int fd, const void *buf, size_t count,
 static int ctdb_test_socket(int domain, int type, int protocol,
 			    const char *location)
 {
-	if (should_i_fail("socket")) {
+	if (should_i_fail("socket", location)) {
 		errno = EINVAL;
 		return -1;
 	}
@@ -333,7 +333,7 @@ static int ctdb_test_socket(int domain, int type, int protocol,
 static int ctdb_test_connect(int sockfd, const struct sockaddr *addr,
 			     socklen_t addrlen, const char *location)
 {
-	if (should_i_fail("connect")) {
+	if (should_i_fail("connect", location)) {
 		errno = EINVAL;
 		return -1;
 	}
@@ -347,7 +347,7 @@ static struct tdb_context *ctdb_test_tdb_open_ex(const char *name,
 						 tdb_hash_func hash_fn,
 						 const char *location)
 {
-	if (should_i_fail("tdb_open_ex")) {
+	if (should_i_fail("tdb_open_ex", location)) {
 		errno = ENOENT;
 		return NULL;
 	}

ctdb/libctdb/test/failtest.c

@@ -199,11 +199,23 @@ bool am_parent(void)
 	return true;
 }
 
+static char *make_location(const char *func, const char *caller)
+{
+	const char *afterslash;
+
+	afterslash = strrchr(caller, '/');
+	if (afterslash)
+		afterslash++;
+	else
+		afterslash = caller;
+	return talloc_asprintf(working, "%s(%s)", func, afterslash);
+}
+
 /* Should I fail at this point?  Once only: it would be too expensive
  * to fail at every possible call. */
-bool should_i_fail_once(const char *location)
+bool should_i_fail_once(const char *func, const char *caller)
 {
-	char *p;
+	char *p, *location = make_location(func, caller);
 	struct fail_decision *i;
 
 	if (failpath) {
@@ -219,7 +231,7 @@ bool should_i_fail_once(const char *location)
 		if (streq(location, i->location))
 			return false;
 
-	if (should_i_fail(location)) {
+	if (should_i_fail(func, caller)) {
 		excessive_fails++;
 		return true;
 	}
@@ -227,16 +239,17 @@ bool should_i_fail_once(const char *location)
 }
 
 /* Should I fail at this point? */
-bool should_i_fail(const char *func)
+bool should_i_fail(const char *func, const char *caller)
 {
 	pid_t child;
 	int status, pfd[2];
 	struct fail_decision *dec;
 	size_t log_size;
 	char *log;
+	char *location = make_location(func, caller);
 
 	if (failpath)
-		return do_failpath(func);
+		return do_failpath(location);
 
 	failpoints++;
 	if (!failtest)
@@ -251,7 +264,7 @@ bool should_i_fail(const char *func)
 	}
 
 	dec = talloc(NULL, struct fail_decision);
-	dec->location = talloc_strdup(dec, func);
+	dec->location = talloc_steal(dec, location);
 	dec->tui_line = tui_linenum;
 
 	DLIST_ADD_END(decisions, dec, struct fail_decision);

ctdb/libctdb/test/failtest.h

@@ -2,8 +2,8 @@
 #define FAILTEST_H
 #include <stdbool.h>
 
-bool should_i_fail_once(const char *location);
-bool should_i_fail(const char *func);
+bool should_i_fail_once(const char *func, const char *caller);
+bool should_i_fail(const char *func, const char *caller);
 
 bool failtest;