> Unfortunately you probably can’t do any better than that, since there’s no
cheap way to find out if another process has the file open.
proc_listpidspath() is meant for this, but it is indeed quite expensive. In
my testing, it takes about a second to complete this call; furthermore, its
status as a supported API is unclear. Nonetheless, here's some
somewhat-tested code of how to use it:
==============================
#import <libproc.h>
- (NSSet *)pidsAccessingPath: (NSString *)path
{
const char *pathFileSystemRepresentation = nil;
int listpidspathResult = 0;
size_t pidsSize = 0;
pid_t *pids = nil;
NSUInteger pidsCount = 0,
i = 0;
NSMutableSet *result = nil;
NSParameterAssert(path && [path length]);
pathFileSystemRepresentation = [path GCSafeFileSystemRepresentation];
listpidspathResult = proc_listpidspath(PROC_ALL_PIDS, 0,
pathFileSystemRepresentation, PROC_LISTPIDSPATH_EXCLUDE_EVTONLY, nil, 0);
ALAssertOrPerform(listpidspathResult >= 0, goto cleanup);
pidsSize = (listpidspathResult ? listpidspathResult : 1);
pids = malloc(pidsSize);
ALAssertOrPerform(pids, goto cleanup);
listpidspathResult = proc_listpidspath(PROC_ALL_PIDS, 0,
pathFileSystemRepresentation, PROC_LISTPIDSPATH_EXCLUDE_EVTONLY, pids,
pidsSize);
ALAssertOrPerform(listpidspathResult >= 0, goto cleanup);
pidsCount = (listpidspathResult / sizeof(*pids));
result = [NSMutableSet set];
for (i = 0; i < pidsCount; i++)
[result addObject: [NSNumber numberWithInt: pids[i]]];
cleanup:
{
if (pids)
free(pids),
pids = nil;
}
return result;
}
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