I have some software that's been running on Linux (kernel 2.4) systems
for a number of years. On the boxes we've recently upgraded to 2.6
kernels this same code now fails every time. The problem occurs when we
initially call pth_sigmask() to block all the signals.
Example code:
---------------------
#include <signal.h>
#include <errno.h>
#include <pth.h>
int main (int argc, char *argv[])
{
using namespace std;
sigset_t ss, old_ss;
cout << "Blocking signals..." << endl;
sigfillset(&ss);
int rc = sigprocmask(SIG_SETMASK, &ss, 0);
//pth_sigmask(SIG_SETMASK, &ss, 0);
cout << "Signals blocked: rc " << rc << " errno: " << errno << "
- "
<< strerror(errno) << endl;
}
----------------
Our libpth was configured with --enable-syscall-soft, so the above fails
as is.
GDB Output:
(gdb) r
Starting program: /home/lhearne/work/tmp/signals
Blocking signals...
Program received signal SIGSEGV, Segmentation fault.
0x00138d57 in sigprocmask () from /lib/tls/libc.so.6
(gdb) backtrace
#0 0x00138d57 in sigprocmask () from /lib/tls/libc.so.6
#1 0x0097325a in pth_sigmask () from /usr/local/lib/libpth.so.20
#2 0x08048a88 in main (argc=1, argv=0xfeff17d4) at signals.cpp:16
If the pth header is excluded from above code the standard system call
is made and the program runs to completion.
Has anyone else come across this problem, or can anyone get the example
to run on a 2.6 based system?
For pth_sigmask the pth manual states "...alternatively you can also
directly call sigprocmask(2), but for consistency reasons you should use
this function pth_sigmask(3)." Is there anything lost by just calling
sigprocmask? Ideally I like to find a pth solution that is compatible
with both kernels. :-)
Detail of the 2.6 system I've tested this on:
Fedora Core 3
$ uname -rv
2.6.9-1.681_FC3 #1 Thu Nov 18 15:10:10 EST 2004
$ pth-config --version
GNU Pth 2.0.3 (03-Dec-2004)
$ gcc --version
gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)
$ rpm --query glibc
glibc-2.3.3-74
SuSE Enterprise
$ uname -rv
2.6.5-7.111.5-smp #1 SMP Wed Nov 17 11:08:17 UTC 2004
$ pth-config --version
GNU Pth 2.0.2 (12-Sep-2004)
$ gcc --version
gcc (GCC) 3.3.3 (SuSE Linux)
$ rpm --query glibc
glibc-2.3.3-98.31
Thanks for reading,
- Lee Hearne
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