Dave Kleikamp wrote:
[...] through the jfs_debugfs utility. The timestamp is set when the
file is created, but never modified after that.
He just submitted it to the jfs-discussion mailing list this morning, so
it needs a little bit of review, but I think it will probably make the
2.6.17 kernel.
Is there a straightforward way to detect this
at both compile- and run-time?
At **worst** one could try to dlsym a
pointer to the interface the first time
someone tries to use it and return
errno=ENOTSUP to that and
all subsequent calls if it's not there.
int sys_set_create_time(int fd) {
static enum exists (UNTESTED=-1,
PRESENT=1, ABSENT=0} = UNTESTED;
if (exists == UNTESTED) {
if (dlsym(RTLD_NEXT,set_create_time) == NULL) {
exists = ABSENT;
errno = ENOTSUP;
return -1;
}
else {
exists = PRESENT
}
}
switch (exists) {
case ABSENT;
errno = ENOTSUP;
return -1;
case PRESENT:
return set_create_time(fd);
}
}
--dave
--
David Collier-Brown, | Always do right. This will gratify
Sun Microsystems, Toronto | some people and astonish the rest
[EMAIL PROTECTED] | -- Mark Twain
(416) 263-5733 (x65733) |
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