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/**
* un programma, lanciato due volte come trasmittente e ricevente,
* comunica tramite una pipe con nome sul file-system (FIFO);
* da invocare come:
* - trasmittente: fifo T
* - ricevente: fifo R
*
* tentano di scambiarsi messaggi di dimensione variabile
* (dimostrando i limiti delle pipe/fifo)
*/
#include
#include
#include
#include
#include
#include
#include
#define BUFSIZE 1024
#define NUM_MSG 20
int main (int argc, char *argv[]) {
int i, fd, len;
char buffer[BUFSIZE];
const char *pathname = "/tmp/fifo";
if (argc < 2) {
fprintf(stderr, "uso: %s T|R\n", argv[0]);
exit(1);
}
if (argv[1][0] == 'T') { // trasmittente
if (mkfifo(pathname, 0777) == -1) {
perror(pathname);
exit(1);
}
if ((fd = open(pathname, O_WRONLY)) == -1) {
perror(pathname);
unlink(pathname);
exit(1);
}
for (i=0; i