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Added index locks a bit stronger.

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This commit is contained in:
default 2023-02-22 19:09:05 +01:00
parent 23c433ee02
commit 450863031b
1 changed files with 24 additions and 2 deletions
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26
data.c
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@ -243,11 +243,25 @@ double mtime_nl(const char *fn, int *n_link)
/** indexes **/ /** indexes **/
FILE *index_lock(const char *fn)
{
xs *lck = xs_fmt("%s.lck", fn);
FILE *f = fopen(lck, "a");
flock(fileno(f), LOCK_EX);
return f;
}
int index_add_md5(const char *fn, const char *md5) int index_add_md5(const char *fn, const char *md5)
/* adds an md5 to an index */ /* adds an md5 to an index */
{ {
int status = 201; /* Created */ int status = 201; /* Created */
FILE *f; FILE *l, *f;
if ((l = index_lock(fn)) == NULL)
return 500;
if ((f = fopen(fn, "a")) != NULL) { if ((f = fopen(fn, "a")) != NULL) {
flock(fileno(f), LOCK_EX); flock(fileno(f), LOCK_EX);
@ -261,6 +275,8 @@ int index_add_md5(const char *fn, const char *md5)
else else
status = 500; status = 500;
fclose(l);
return status; return status;
} }
@ -277,7 +293,10 @@ int index_del_md5(const char *fn, const char *md5)
/* deletes an md5 from an index */ /* deletes an md5 from an index */
{ {
int status = 404; int status = 404;
FILE *i, *o; FILE *l, *i, *o;
if ((l = index_lock(fn)) == NULL)
return 500;
if ((i = fopen(fn, "r")) != NULL) { if ((i = fopen(fn, "r")) != NULL) {
flock(fileno(i), LOCK_EX); flock(fileno(i), LOCK_EX);
@ -296,6 +315,7 @@ int index_del_md5(const char *fn, const char *md5)
xs *ofn = xs_fmt("%s.bak", fn); xs *ofn = xs_fmt("%s.bak", fn);
unlink(ofn);
link(fn, ofn); link(fn, ofn);
rename(nfn, fn); rename(nfn, fn);
} }
@ -307,6 +327,8 @@ int index_del_md5(const char *fn, const char *md5)
else else
status = 500; status = 500;
fclose(l);
return status; return status;
} }