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gdb x86_64 ERESTARTNOHAND
- From: Rich Coe <Richard dot Coe at med dot ge dot com>
- To: gdb at sources dot redhat dot com
- Date: Tue, 14 Jun 2005 08:54:25 -0500
- Subject: gdb x86_64 ERESTARTNOHAND
Run the program below in gdb on x86_64, compiled either -m32 or 64 bit,
stop the execution with control-C
call a function, in this case doNothing(), but sleep(1) works as well
continue
gdb passes errno 514 to the program. 514=ERESTARTNOHAND
I see that strace prints out information about ERESTARTNOHAND, so it knows
about it. I was wondering if gdb should know about this, is this an
x86_64 kernel error, or what?
Even though strace knows about ERESTARTNOHAND on i386, and prints it,
gdb does not print or cause the program to receive this errno on a 32bit kernel.
--
Rich Coe richard.coe@med.ge.com
General Electric Healthcare Technologies
Global Software Platforms, Computer Technology Team
#include <stdio.h>
#include <sys/select.h>
#include <errno.h>
#include <signal.h>
int myselect(int fd, void* ptr)
{
printf("myselect\n");
fd_set in;
AGAIN:
FD_ZERO(&in);
FD_SET(fd, &in);
if(select(32, &in, 0, 0, 0) == -1)
{
printf("select error=%d: %s\n", errno, strerror(errno));
}
goto AGAIN;
return 0;
}
int func_two(int fd, void* ptr)
{
printf("func_two\n");
return myselect(fd, ptr);
}
int func_one(int fd, void*ptr)
{
printf("func_one\n");
return func_two(fd, ptr);
}
void catch(int sig)
{
char buf[218];
sprintf(buf, "caught %d\n", sig);
write(fileno(stdout), buf, strlen(buf));
}
void docatch()
{
struct sigaction act = { 0 } ;
act.sa_handler = catch;
//act.sa_mask = 0;
act.sa_flags = 0;
/* auto restart interrupted system calls */
act.sa_flags = SA_RESTART;
if(sigaction(SIGINT, &act, NULL) < 0) {
perror(__FILE__ ": sigaction");
exit(1);
}
if(sigaction(SIGHUP, &act, NULL) < 0) {
perror(__FILE__ ": sigaction");
exit(1);
}
if(sigaction(SIGTERM, &act, NULL) < 0) {
perror(__FILE__ ": sigaction");
exit(1);
}
}
int a = 0;
void
doNothing()
{
a += 5;
}
int main(int argc, char*argv[])
{
doNothing();
docatch();
printf("main\n");
return func_one(fileno(stdin), myselect);
}