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#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/select.h>
#include <unistd.h>
#define MAXBUF 2048
int
main()
{
char bufin[MAXBUF], bufout[MAXBUF], *bi, *bo;
fd_set rfds0, rfds1;
int c, fdin, fdout, flags, i, nin, nout, state;
struct timeval tv;
if(!(fdin = open("/var/tmp/r.in", O_WRONLY)))
err(1, "open");
if(!(fdout = open("/var/tmp/r.out", O_RDONLY)))
err(1, "open");
FD_ZERO(&rfds0);
FD_ZERO(&rfds1);
tv.tv_sec = 0;
tv.tv_usec = 1;
for(;;){
/* Read from named pipe (out) and print on standard in. */
FD_SET(fdout, &rfds1);
if(select(fdout+1, &rfds1, NULL, NULL, &tv) > 0){
nout = read(fdout, bufout, MAXBUF);
if(!nout) continue;
bufout[nout] = 0;
/* Ignore repetition of typed command. */
for(bi = bufin, bo = bufout;;){
if(*bo == '\n')
break;
if(*bo == 13){
bo++;
continue;
}
if(*bi != *bo){
printf("%s", bufout);
fflush(stdout);
break;
}
bi++; bo++;
}
bufin[0] = 0;
}
/* Read from standard in and print on named pipe (in). */
FD_SET(0, &rfds0);
if(select(0+1, &rfds0, NULL, NULL, &tv) > 0){
nout = read(0, bufin, MAXBUF);
bufin[nout] = 0;
dprintf(fdin, "%s", bufin);
fflush(stdout);
}
}
}
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