The function remove_lock_file_on_signal() is used as a signal handler.
It is not realistic to make the signal handler conform strictly to the
C standard, which is very restrictive about what a signal handler is
allowed to do. But let's increase the likelihood that it will work:
The lock_file_list global variable and several fields from struct
lock_file are used by the signal handler. Declare those values
"volatile" to increase the chance that the signal handler will see a
valid object state.
Suggested-by: Johannes Sixt <j.sixt@xxxxxxxxxxxxx>
Signed-off-by: Michael Haggerty <mhagger@xxxxxxxxxxxx>
---
cache.h | 6 +++---
lockfile.c | 2 +-
refs.c | 5 +++--
3 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/cache.h b/cache.h
index b7af173..9019c7d 100644
--- a/cache.h
+++ b/cache.h
@@ -538,10 +538,10 @@ extern int refresh_index(struct index_state *, unsigned int flags, const struct
#define LOCK_SUFFIX_LEN 5
struct lock_file {
- struct lock_file *next;
+ struct lock_file *volatile next;
volatile sig_atomic_t active;
- int fd;
- pid_t owner;
+ volatile int fd;
+ volatile pid_t owner;
char on_list;
char filename[PATH_MAX];
};
diff --git a/lockfile.c b/lockfile.c
index 50a0541..fce53f1 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -69,7 +69,7 @@
* See Documentation/api-lockfile.txt for more information.
*/
-static struct lock_file *lock_file_list;
+static struct lock_file *volatile lock_file_list;
static const char *alternate_index_output;
static void remove_lock_file(void)
diff --git a/refs.c b/refs.c
index cb2f825..db8057c 100644
--- a/refs.c
+++ b/refs.c
@@ -2213,15 +2213,16 @@ int commit_packed_refs(void)
struct packed_ref_cache *packed_ref_cache =
get_packed_ref_cache(&ref_cache);
int error = 0;
+ int fd;
if (!packed_ref_cache->lock)
die("internal error: packed-refs not locked");
write_or_die(packed_ref_cache->lock->fd,
PACKED_REFS_HEADER, strlen(PACKED_REFS_HEADER));
+ fd = packed_ref_cache->lock->fd;
do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache),
- 0, write_packed_entry_fn,
- &packed_ref_cache->lock->fd);
+ 0, write_packed_entry_fn, &fd);
if (commit_lock_file(packed_ref_cache->lock))
error = -1;
packed_ref_cache->lock = NULL;
--
1.9.1
--
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