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Code Issues Releases Wiki Activity

Fix double close of the lock file

Browse Source 
According to FOPEN(3), using fclose on an fdopen'd file stream also
closes the underlying file descriptor. This happened in _alpm_lckmk
(util.c), which meant that when alpm_trans_release closed it again, the
log file (which reused the original file descriptor) was closed instead.

Signed-off-by: Jonathan Conder <jonno.conder@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Jonathan Conder 2011-02-05 13:39:37 +13:00 committed by Dan McGee
parent e8f799ba83
commit acd9269478
5 changed files with 10 additions and 15 deletions
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1
lib/libalpm/handle.c
View File

@ -49,7 +49,6 @@ pmhandle_t *_alpm_handle_new()
ALPM_LOG_FUNC;
CALLOC(handle, 1, sizeof(pmhandle_t), RET_ERR(PM_ERR_MEMORY, NULL));
handle->lckfd = -1;
return(handle);
}

2
lib/libalpm/handle.h
View File

@ -34,7 +34,7 @@ typedef struct _pmhandle_t {
pmdb_t *db_local; /* local db pointer */
alpm_list_t *dbs_sync; /* List of (pmdb_t *) */
FILE *logstream; /* log file stream pointer */
int lckfd; /* lock file descriptor if one exists */
FILE *lckstream; /* lock file stream pointer if one exists */
pmtrans_t *trans;
/* callback functions */

13
lib/libalpm/trans.c
View File

@ -73,8 +73,8 @@ int SYMEXPORT alpm_trans_init(pmtransflag_t flags,
/* lock db */
if(!(flags & PM_TRANS_FLAG_NOLOCK)) {
handle->lckfd = _alpm_lckmk();
if(handle->lckfd == -1) {
handle->lckstream = _alpm_lckmk();
if(handle->lckstream == NULL) {
RET_ERR(PM_ERR_HANDLE_LOCK, -1);
}
}
@ -260,12 +260,9 @@ int SYMEXPORT alpm_trans_release()
/* unlock db */
if(!nolock_flag) {
if(handle->lckfd != -1) {
int fd;
do {
fd = close(handle->lckfd);
} while(fd == -1 && errno == EINTR);
handle->lckfd = -1;
if(handle->lckstream != NULL) {
fclose(handle->lckstream);
handle->lckstream = NULL;
}
if(_alpm_lckrm()) {
_alpm_log(PM_LOG_WARNING, _("could not remove lock file %s\n"),

7
lib/libalpm/util.c
View File

@ -211,7 +211,7 @@ char *_alpm_strtrim(char *str)
}
/* Create a lock file */
int _alpm_lckmk(void)
FILE *_alpm_lckmk(void)
{
int fd;
char *dir, *ptr;
@ -234,10 +234,9 @@ int _alpm_lckmk(void)
fprintf(f, "%ld\n", (long)getpid());
fflush(f);
fsync(fd);
fclose(f);
return(fd);
return(f);
}
return(-1);
return(NULL);
}
/* Remove a lock file */

2
lib/libalpm/util.h
View File

@ -80,7 +80,7 @@ int _alpm_makepath(const char *path);
int _alpm_makepath_mode(const char *path, mode_t mode);
int _alpm_copyfile(const char *src, const char *dest);
char *_alpm_strtrim(char *str);
int _alpm_lckmk(void);
FILE *_alpm_lckmk(void);
int _alpm_lckrm(void);
int _alpm_unpack_single(const char *archive, const char *prefix, const char *fn);
int _alpm_unpack(const char *archive, const char *prefix, alpm_list_t *list, int breakfirst);