What's wrong with this code?
johnl at iecc.com
Tue Dec 13 05:39:24 UTC 2011
This tiny routine is in a .so loadable module I use. (It's part of the mailfront
static const char* date_string(void)
static char datebuf;
time_t now = time(0);
struct tm* tm = gmtime(&now);
strftime(datebuf, sizeof datebuf - 1, "%d %b %Y %H:%M:%S -0000", tm);
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:
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?
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