Date: 13 Dec 2011 05:12:20 -0000 From: "John Levine" <johnl@iecc.com> To: freebsd-questions@freebsd.org Subject: What's wrong with this code? Message-ID: <20111213051220.45894.qmail@joyce.lan>
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This tiny routine is in a .so loadable module I use. (It's part of the mailfront
SMTP daemon.)
static const char* date_string(void)
{
static char datebuf[64];
time_t now = time(0);
struct tm* tm = gmtime(&now);
strftime(datebuf, sizeof datebuf - 1, "%d %b %Y %H:%M:%S -0000", tm);
return datebuf;
}
I was getting bogus dates. Running it under GDB, time() is returning
-1, and setting errno to 22, which is EINVAL. Changing the call to
time to time(NULL) or time(&now) made no difference.
I changed it to a call to gettimeofday(), which works fine. But what
could the problem have been? When I splice this routine into a tiny
test program that calls it and prints out the result, it works fine.
The obvious problem, since it's in a .so, is that it's linking to something other than
the system library time() function, but I did an nm on the .so, and it said this,
which sure looks like the system time() function to me:
U time@@FBSD_1.0
Setting a breakpoint in gdb gets a complaint about trying to set a breakpoint in /lib/libc.so.7.
Any ideas what the problem was?
R's,
John
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