Target: Windows Mobile 6.0
Compiler: cegcc (both 0.51.0 and SVN (updated 2008-06-14))
I'm having issues getting select() to work on my target; note that I
have yet to try testing other targets.
When I tried to run the sample code included in the glibc man-page, I
found that it would segfault on the select() call. I then compiled it as
static and ran it remotely under gdb, and found that it was crashing at
newlib/libc/src/wince/msnet.c:175 (in the __MS_select):
return( (*select)(nfds, rfds, wfds, efds, timeout));
The problem appears to be that __msnet_init() is never called, and so
the select function pointer is NULL.
I added a call to __msnet_init() to the sample code below and tried
running it again; this time it didn't crash, but unfortunately it
returned the following error (via perror()):
select(): Bad file number
Does anyone have any idea what the problem might be?
Is this, perhaps, an issue with WM6?
Sample code follows:
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
int
main(void)
{
fd_set rfds;
struct timeval tv;
int retval;
/* __msnet_init(); */
/* Watch stdin (fd 0) to see when it has input. */
FD_ZERO(&rfds);
FD_SET(0, &rfds);
/* Wait up to five seconds. */
tv.tv_sec = 5;
tv.tv_usec = 0;
retval = select(1, &rfds, NULL, NULL, &tv);
/* Dont rely on the value of tv now! */
if (retval == -1)
perror("select()");
else if (retval)
printf("Data is available now.\n");
/* FD_ISSET(0, &rfds) will be true. */
else
printf("No data within five seconds.\n");
exit(EXIT_SUCCESS);
}
Cheers,
--
Lance Fetters
Ogaki, Gifu, Japan
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