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KBD.C
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C/C++ Source or Header
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1989-10-10
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1KB
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69 lines
#include "jove.h"
#include <signal.h>
#include <errno.h>
#ifdef BSD_SIGS
# define pause() sigpause(0L)
#endif
struct header {
int pid,
nbytes;
char buf[10];
};
#define HEADER_SIZE (2 * sizeof (int))
/* JOVE sends SIGQUIT whenever it wants the kbd process (this program)
to stop competing for input from the keyboard. JOVE does this when
JOVE realizes that there are no more interactive processes running.
The reason we go through all this trouble is that JOVE slows down
a lot when it's getting its keyboard input via a pipe. */
static SIGRESULT strt_read proto((int));
static SIGRESULT
hold_read(junk)
int junk; /* passed in when invoked by a signal; of no interest */
{
signal(SIGQUIT, strt_read);
pause();
SIGRETURN;
}
static SIGRESULT
strt_read(junk)
int junk;
{
signal(SIGQUIT, hold_read);
SIGRETURN;
}
int
main(argc, argv)
int argc;
char **argv;
{
struct header header;
int pid,
n;
signal(SIGINT, SIG_IGN);
pid = getpid();
header.pid = pid;
hold_read(0);
for (;;) {
n = read(0, header.buf, sizeof (header.buf));
if (n == -1) {
if (errno != EINTR)
break;
continue;
}
header.nbytes = n;
write(1, (UnivPtr) &header, HEADER_SIZE + n);
}
return 0;
}