On Friday 28 March 2008 20:03, James Simmons wrote:
>
> Hi!
>
> I needed cat to read until a eof or read would block. I have a
> patch that does a work around but I don't feel that is the right
> approach. Especially since it is not a standard cat option.
> Anyway to have that happen?
blocking.c
==========
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main()
{
fcntl(0, F_SETFL, fcntl(0, F_GETFL) & ~O_NONBLOCK);
return 0;
}
nonblocking.c
=============
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main()
{
fcntl(0, F_SETFL, fcntl(0, F_GETFL) | O_NONBLOCK);
return 0;
}
Usage:
# { echo TEST; sleep 1; } | { ./nonblocking; cat; ./blocking; } >result
cat: read error: Resource temporarily unavailable
and file "result" contains "TEST", as expected.
--
vda
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