int fd;
};
-struct fd_orig {
- int fd;
- off_t offset;
- size_t size;
- bool dupped;
-};
-
struct write_info {
struct write_info_hdr hdr;
char *data;
- size_t oldlen;
- char *olddata;
};
struct lock_info {
static struct write_info *child_writes = NULL;
static unsigned int child_writes_num = 0;
-static struct fd_orig *fd_orig = NULL;
-static unsigned int fd_orig_num = 0;
-
static pid_t lock_owner;
static struct lock_info *locks = NULL;
static unsigned int lock_num = 0;
history[history_num].type = type;
history[history_num].file = file;
history[history_num].line = line;
+ history[history_num].cleanup = NULL;
memcpy(&history[history_num].u, elem, elem_size);
return &history[history_num++];
}
#define add_history(type, file, line, elem) \
add_history_((type), (file), (line), (elem), sizeof(*(elem)))
-static void save_fd_orig(int fd)
-{
- unsigned int i;
-
- for (i = 0; i < fd_orig_num; i++)
- if (fd_orig[i].fd == fd)
- return;
-
- fd_orig = realloc(fd_orig, (fd_orig_num + 1) * sizeof(*fd_orig));
- fd_orig[fd_orig_num].fd = fd;
- fd_orig[fd_orig_num].dupped = false;
- fd_orig[fd_orig_num].offset = lseek(fd, 0, SEEK_CUR);
- fd_orig[fd_orig_num].size = lseek(fd, 0, SEEK_END);
- lseek(fd, fd_orig[fd_orig_num].offset, SEEK_SET);
- fd_orig_num++;
-}
+#define set_cleanup(call, clean, type) \
+ (call)->cleanup = (void *)((void)sizeof(clean((type *)NULL)), (clean))
bool failtest_default_hook(struct failtest_call *history, unsigned num)
{
return false;
}
+static void cleanup_calloc(struct calloc_call *call)
+{
+ free(call->ret);
+}
+
void *failtest_calloc(size_t nmemb, size_t size,
const char *file, unsigned line)
{
p->error = ENOMEM;
} else {
p->u.calloc.ret = calloc(nmemb, size);
+ set_cleanup(p, cleanup_calloc, struct calloc_call);
}
errno = p->error;
return p->u.calloc.ret;
}
+static void cleanup_malloc(struct malloc_call *call)
+{
+ free(call->ret);
+}
+
void *failtest_malloc(size_t size, const char *file, unsigned line)
{
struct failtest_call *p;
p->error = ENOMEM;
} else {
p->u.calloc.ret = malloc(size);
+ set_cleanup(p, cleanup_malloc, struct malloc_call);
}
errno = p->error;
return p->u.calloc.ret;
}
+static void cleanup_realloc(struct realloc_call *call)
+{
+ free(call->ret);
+}
+
+/* Walk back and find out if we got this ptr from a previous routine. */
+static void fixup_ptr_history(void *ptr, unsigned int last)
+{
+ int i;
+
+ /* Start at end of history, work back. */
+ for (i = last - 1; i >= 0; i--) {
+ switch (history[i].type) {
+ case FAILTEST_REALLOC:
+ if (history[i].u.realloc.ret == ptr) {
+ history[i].cleanup = NULL;
+ return;
+ }
+ break;
+ case FAILTEST_MALLOC:
+ if (history[i].u.malloc.ret == ptr) {
+ history[i].cleanup = NULL;
+ return;
+ }
+ break;
+ case FAILTEST_CALLOC:
+ if (history[i].u.calloc.ret == ptr) {
+ history[i].cleanup = NULL;
+ return;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+}
+
void *failtest_realloc(void *ptr, size_t size, const char *file, unsigned line)
{
struct failtest_call *p;
p->u.realloc.ret = NULL;
p->error = ENOMEM;
} else {
+ fixup_ptr_history(ptr, history_num-1);
p->u.realloc.ret = realloc(ptr, size);
+ set_cleanup(p, cleanup_realloc, struct realloc_call);
}
errno = p->error;
return p->u.realloc.ret;
}
+void failtest_free(void *ptr)
+{
+ fixup_ptr_history(ptr, history_num);
+ free(ptr);
+}
+
+static void cleanup_open(struct open_call *call)
+{
+ close(call->ret);
+}
+
int failtest_open(const char *pathname,
const char *file, unsigned line, ...)
{
p->error = EACCES;
} else {
p->u.open.ret = open(pathname, call.flags, call.mode);
+ set_cleanup(p, cleanup_open, struct open_call);
+ p->u.open.dup_fd = p->u.open.ret;
}
errno = p->error;
return p->u.open.ret;
}
+static void cleanup_pipe(struct pipe_call *call)
+{
+ if (!call->closed[0])
+ close(call->fds[0]);
+ if (!call->closed[1])
+ close(call->fds[1]);
+}
+
int failtest_pipe(int pipefd[2], const char *file, unsigned line)
{
struct failtest_call *p;
p->error = EMFILE;
} else {
p->u.pipe.ret = pipe(p->u.pipe.fds);
+ p->u.pipe.closed[0] = p->u.pipe.closed[1] = false;
+ set_cleanup(p, cleanup_pipe, struct pipe_call);
}
/* This causes valgrind to notice if they use pipefd[] after failure */
memcpy(pipefd, p->u.pipe.fds, sizeof(p->u.pipe.fds));
return p->u.pipe.ret;
}
+static void cleanup_read(struct read_call *call)
+{
+ lseek(call->fd, call->off, SEEK_SET);
+}
+
ssize_t failtest_pread(int fd, void *buf, size_t count, off_t off,
const char *file, unsigned line)
{
call.off = off;
p = add_history(FAILTEST_READ, file, line, &call);
- /* This is going to change seek offset, so save it. */
- if (control_fd != -1)
- save_fd_orig(fd);
-
/* FIXME: Try partial read returns. */
if (should_fail(p)) {
p->u.read.ret = -1;
p->error = EIO;
} else {
p->u.read.ret = pread(fd, buf, count, off);
+ set_cleanup(p, cleanup_read, struct read_call);
}
errno = p->error;
return p->u.read.ret;
return &writes[writes_num++];
}
+static void cleanup_write(struct write_call *call)
+{
+ lseek(call->dup_fd, call->off, SEEK_SET);
+ write(call->dup_fd, call->saved_contents, call->saved_len);
+ lseek(call->dup_fd, call->off, SEEK_SET);
+ ftruncate(call->dup_fd, call->old_filelen);
+ free(call->saved_contents);
+}
+
ssize_t failtest_pwrite(int fd, const void *buf, size_t count, off_t off,
const char *file, unsigned line)
{
struct failtest_call *p;
struct write_call call;
- off_t offset;
- call.fd = fd;
+ call.fd = call.dup_fd = fd;
call.buf = buf;
call.count = count;
call.off = off;
p = add_history(FAILTEST_WRITE, file, line, &call);
- offset = lseek(fd, 0, SEEK_CUR);
+ /* Save old contents if we can */
+ if (p->u.write.off != -1) {
+ ssize_t ret;
+ p->u.write.old_filelen = lseek(fd, 0, SEEK_END);
+
+ /* Write past end of file? Nothing to save.*/
+ if (p->u.write.old_filelen <= p->u.write.off)
+ p->u.write.saved_len = 0;
+ /* Write which goes over end of file? Partial save. */
+ else if (p->u.write.off + count > p->u.write.old_filelen)
+ p->u.write.saved_len = p->u.write.old_filelen
+ - p->u.write.off;
+ /* Full save. */
+ else
+ p->u.write.saved_len = count;
+
+ p->u.write.saved_contents = malloc(p->u.write.saved_len);
+ lseek(fd, p->u.write.off, SEEK_SET);
+ ret = read(fd, p->u.write.saved_contents, p->u.write.saved_len);
+ if (ret != p->u.write.saved_len)
+ err(1, "Expected %i bytes, got %i",
+ (int)p->u.write.saved_len, (int)ret);
+ lseek(fd, p->u.write.off, SEEK_SET);
+ set_cleanup(p, cleanup_write, struct write_call);
+ }
- /* If we're a child, save contents and tell parent about write. */
+ /* If we're a child, tell parent about write. */
if (control_fd != -1) {
struct write_info *winfo = new_write();
enum info_type type = WRITE;
- save_fd_orig(fd);
-
winfo->hdr.len = count;
winfo->hdr.fd = fd;
winfo->data = malloc(count);
memcpy(winfo->data, buf, count);
- winfo->hdr.offset = offset;
- if (winfo->hdr.offset != (off_t)-1) {
- lseek(fd, offset, SEEK_SET);
- winfo->olddata = malloc(count);
- winfo->oldlen = read(fd, winfo->olddata, count);
- if (winfo->oldlen == -1)
- winfo->oldlen = 0;
- }
+ winfo->hdr.offset = off;
write_all(control_fd, &type, sizeof(type));
write_all(control_fd, &winfo->hdr, sizeof(winfo->hdr));
write_all(control_fd, winfo->data, count);
if (child_writes[0].hdr.fd != fd)
errx(1, "Child wrote to fd %u, not %u?",
child_writes[0].hdr.fd, fd);
- if (child_writes[0].hdr.offset != offset)
+ if (child_writes[0].hdr.offset != p->u.write.off)
errx(1, "Child wrote to offset %zu, not %zu?",
(size_t)child_writes[0].hdr.offset,
- (size_t)offset);
+ (size_t)p->u.write.off);
if (child_writes[0].hdr.len != count)
errx(1, "Child wrote length %zu, not %zu?",
child_writes[0].hdr.len, count);
/* Is this is a socket or pipe, child wrote it
already. */
- if (offset == (off_t)-1) {
+ if (p->u.write.off == (off_t)-1) {
p->u.write.ret = count;
errno = p->error;
return p->u.write.ret;
/* We only trap this so we can dup fds in case we need to restore. */
int failtest_close(int fd)
{
- unsigned int i;
- int newfd = -1;
-
- for (i = 0; i < fd_orig_num; i++) {
- if (fd_orig[i].fd == fd) {
- fd_orig[i].fd = newfd = dup(fd);
- fd_orig[i].dupped = true;
+ int new_fd = -1, i;
+
+ if (fd < 0)
+ return close(fd);
+
+ /* Trace history to find source of fd, and if we need to cleanup writes. */
+ for (i = history_num-1; i >= 0; i--) {
+ switch (history[i].type) {
+ case FAILTEST_WRITE:
+ if (history[i].u.write.fd != fd)
+ break;
+ if (!history[i].cleanup)
+ break;
+ /* We need to save fd so we can restore file. */
+ if (new_fd == -1)
+ new_fd = dup(fd);
+ history[i].u.write.dup_fd = new_fd;
+ break;
+ case FAILTEST_READ:
+ /* We don't need to cleanup reads on closed fds. */
+ if (history[i].u.read.fd != fd)
+ break;
+ history[i].cleanup = NULL;
+ break;
+ case FAILTEST_PIPE:
+ /* From a pipe? We don't ever restore pipes... */
+ if (history[i].u.pipe.fds[0] == fd) {
+ assert(new_fd == -1);
+ history[i].u.pipe.closed[0] = true;
+ goto out;
+ }
+ if (history[i].u.pipe.fds[1] == fd) {
+ assert(new_fd == -1);
+ history[i].u.pipe.closed[1] = true;
+ goto out;
+ }
+ break;
+ case FAILTEST_OPEN:
+ if (history[i].u.open.ret == fd) {
+ history[i].u.open.dup_fd = new_fd;
+ goto out;
+ }
+ break;
+ default:
+ break;
}
}
- for (i = 0; i < writes_num; i++) {
- if (writes[i].hdr.fd == fd)
- writes[i].hdr.fd = newfd;
- }
-
+out:
locks = add_lock(locks, fd, 0, off_max(), F_UNLCK);
return close(fd);
}
for (i = 0; i < writes_num; i++) {
free(writes[i].data);
- if (writes[i].hdr.offset != (off_t)-1)
- free(writes[i].olddata);
}
free(writes);
- free(fd_orig);
+
+ /* We don't do this in cleanup: needed even for failed opens. */
for (i = 0; i < history_num; i++) {
if (history[i].type == FAILTEST_OPEN)
free((char *)history[i].u.open.pathname);
void failtest_exit(int status)
{
- unsigned int i;
+ int i;
if (control_fd == -1) {
free_everything();
child_fail(NULL, 0, "failtest_exit_check failed\n");
}
- /* Restore any stuff we overwrote. */
- for (i = 0; i < writes_num; i++) {
- if (writes[i].hdr.offset == (off_t)-1)
- continue;
- if (writes[i].oldlen != 0) {
- lseek(writes[i].hdr.fd, writes[i].hdr.offset,
- SEEK_SET);
- write(writes[i].hdr.fd, writes[i].olddata,
- writes[i].oldlen);
- }
- }
-
- /* Fix up fd offsets, restore sizes. */
- for (i = 0; i < fd_orig_num; i++) {
- lseek(fd_orig[i].fd, fd_orig[i].offset, SEEK_SET);
- ftruncate(fd_orig[i].fd, fd_orig[i].size);
- /* Free up any file descriptors we dup'ed. */
- if (fd_orig[i].dupped)
- close(fd_orig[i].fd);
- }
+ /* Cleanup everything, in reverse order. */
+ for (i = history_num - 1; i >= 0; i--)
+ if (history[i].cleanup)
+ history[i].cleanup(&history[i].u);
free_everything();
tell_parent(SUCCESS);
projects / ccan / commitdiff