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- #include <u.h>
- #include <libc.h>
- #include <ip.h>
- void
- usage(void)
- {
- fprint(2, "usage: %s [-x netmtpt]\n", argv0);
- exits("usage");
- }
- void
- main(int argc, char **argv)
- {
- int fd, cfd, n;
- char data[128];
- char devdir[40];
- char buf[4096];
- char net[32];
- char *p;
- setnetmtpt(net, sizeof(net), nil);
- ARGBEGIN{
- case 'x':
- p = ARGF();
- if(p == nil)
- usage();
- setnetmtpt(net, sizeof(net), p);
- break;
- }ARGEND;
- sprint(data, "%s/udp!*!echo", net);
- cfd = announce(data, devdir);
- if(cfd < 0)
- sysfatal("can't announce: %r");
- if(fprint(cfd, "headers") < 0)
- sysfatal("can't set header mode: %r");
- fprint(cfd, "oldheaders");
- sprint(data, "%s/data", devdir);
- fd = open(data, ORDWR);
- if(fd < 0)
- sysfatal("open udp data");
- for(;;){
- n = read(fd, buf, sizeof(buf));
- if(n < 0)
- sysfatal("error reading: %r");
- write(fd, buf, n);
- }
- }
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