mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-26 05:58:05 +11:00
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#include "common.h"
|
|
|
|
/* Sends the contents of `fname` to `device`, expecting every sent byte to be
|
|
* echoed back verbatim. Compare every echoed byte with the one sent and bail
|
|
* out if a mismatch is detected. When the whole file is sent, push a null char
|
|
* to indicate EOF to the receiving end.
|
|
*
|
|
* It is recommended that you send contents that has gone through `ttysafe`.
|
|
*
|
|
* If "delayus" is specified, this will be the delay we wait between the moment
|
|
* we write the "ping" and the moment where we fetch the "pong".
|
|
*/
|
|
int main(int argc, char **argv)
|
|
{
|
|
int delayus = 1000;
|
|
if (argc == 4) {
|
|
delayus = atoi(argv[3]);
|
|
} else if (argc != 3) {
|
|
fprintf(stderr, "Usage: ./pingpong device fname [delayus] \n");
|
|
return 1;
|
|
}
|
|
FILE *fp = fopen(argv[2], "r");
|
|
if (!fp) {
|
|
fprintf(stderr, "Can't open %s.\n", argv[2]);
|
|
return 1;
|
|
}
|
|
int fd = ttyopen(argv[1]);
|
|
unsigned char c;
|
|
int returncode = 0;
|
|
while (fread(&c, 1, 1, fp)) {
|
|
putchar('.');
|
|
fflush(stdout);
|
|
write(fd, &c, 1);
|
|
usleep(delayus); // let it breathe
|
|
if (!mexpect(fd, c)) {
|
|
// mismatch!
|
|
unsigned int pos = ftell(fp);
|
|
fprintf(stderr, "Mismatch at byte %d!\n", pos);
|
|
returncode = 1;
|
|
break;
|
|
}
|
|
}
|
|
// To close the receiving loop on the other side, we send a straight null
|
|
c = 0;
|
|
write(fd, &c, 1);
|
|
printf("Done!\n");
|
|
fclose(fp);
|
|
if (fd > 0) {
|
|
close(fd);
|
|
}
|
|
return returncode;
|
|
}
|
|
|
|
|