Your message dated Sat, 03 Mar 2007 09:45:10 +0000 with message-id <[EMAIL PROTECTED]> and subject line Bug#413195: Variable junk and segfault with gettimeofday function has caused the attached Bug report to be marked as done.
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--- Begin Message ---package: libc6 version: 2.3.6.ds1-11 I incorrectly posted Bug#413078 against kernel, but had similar prob with old kernel too. The bloated version works, but the simple one does not. Any ideas why? Man pages have: PRINTF(3) SYNOPSIS #include <stdio.h> GETTIMEOFDAY(2) SYNOPSIS #include <sys/time.h> #include <time.h> On a K8 machine: [EMAIL PROTECTED]:~/public_html/c-run$ gcc -o gettimeofday_sane gettimeofday_sane.c [EMAIL PROTECTED]:~/public_html/c-run$ gcc -o gettimeofday_bloat gettimeofday_bloat.c [EMAIL PROTECTED]:~/public_html/c-run$ ./gettimeofday_sane 18589.085472 [EMAIL PROTECTED]:~/public_html/c-run$ ./gettimeofday_bloat 0xffdcdf58 1172905545==1172905545==1172905545 1172905545.972903 On a G4 machine: [EMAIL PROTECTED]:~/src$ gcc -o gettimeofday_sane gettimeofday_sane.c [EMAIL PROTECTED]:~/src$ gcc -o gettimeofday_bloat gettimeofday_bloat.c [EMAIL PROTECTED]:~/src$ ./gettimeofday_sane Segmentation fault [EMAIL PROTECTED]:~/src$ ./gettimeofday_bloat 0x7ff20640 1172905674==1172905674==1172905674 1172905674.173928/*#include <stdlib.h>*/ #include <stdio.h> #include <sys/time.h> #include <time.h> int main() { struct timeval *tp; /* struct timeval { unsigned long tv_sec; unsigned long tv_usec; } *tp; struct timeval { time_t tv_sec; suseconds_t tv_usec; } *tp; int j; */ /* time_t tr, tr2, tr3; tr=time(0); */ /* BROKEN arg must be NULL */ /* printf("%p\n",tp); */ /* says (nil) ! */ /* tp->tv_sec=tr; */ /* segfaults even if not NULL */ /* j=gettimeofday(tp, (struct timezone *)0); */ gettimeofday(tp, 0); /* tr3=time(&tr2); printf("%lu==%lu==%lu\n", tr, tr2, tr3); */ printf("%lu.%06lu\n", tp->tv_sec, tp->tv_usec); /* exit(0); */ return 0; }#include <stdlib.h> #include <stdio.h> #include <sys/time.h> #include <time.h> int main() { struct timeval *tp; /* struct timeval { unsigned long tv_sec; unsigned long tv_usec; } *tp; struct timeval { time_t tv_sec; suseconds_t tv_usec; } *tp; int j; */ time_t tr, tr2, tr3; tr=time(0); /* BROKEN arg must be NULL */ printf("%p\n",tp); /* says (nil) ! */ /* tp->tv_sec=tr; */ /* segfaults even if not NULL */ /* j=gettimeofday(tp, (struct timezone *)0); */ gettimeofday(tp, 0); tr3=time(&tr2); printf("%lu==%lu==%lu\n", tr, tr2, tr3); printf("%lu.%06lu\n", tp->tv_sec, tp->tv_usec); exit(0); return 0; }
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--- Begin Message ---On Sat, 2007-03-03 at 16:19 +0900, Andrew Buckeridge wrote: > package: libc6 > version: 2.3.6.ds1-11 > > I incorrectly posted Bug#413078 against kernel, but had similar prob with old > kernel too. > > The bloated version works, but the simple one does not. Any ideas why? I'd suspect luck... Your "sane" version (after stripping out all the commented out sections) returns a constant value on i386. You are passing an uninitialised pointer to gettimeofday() and additionally assuming that gettimeofday() is always succeeding. That function is returning EFAULT here, which would account for the segfaults you're seeing. This version, on the other hand, works fine (ignoring the fact that it doesn't cope with errors returned by gettimeofday()): #include <stdio.h> #include <sys/time.h> #include <time.h> int main() { struct timeval tp; gettimeofday(&tp, 0); printf("%lu.%06lu\n", tp.tv_sec, tp.tv_usec); return 0; } Closing this non-bug. Regards, Adam
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