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132 lines
2.8 KiB
132 lines
2.8 KiB
6 years ago
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#include <litc.h>
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static int lstn(uint16_t lport)
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{
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fprintf(stderr, "listen on port %d\n", (int)lport);
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int s = socket(AF_INET, SOCK_STREAM, 0);
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if (s == -1)
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err(-1, "socket");
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struct sockaddr_in sin;
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sin.sin_family = AF_INET;
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sin.sin_port = htons(lport);
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sin.sin_addr.s_addr = htonl(INADDR_ANY);
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if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) == -1)
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err(-1, "bind");
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if (listen(s, 10) == -1)
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err(-1, "listen");
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int ret;
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socklen_t slen = sizeof(sin);
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if ((ret = accept(s, (struct sockaddr *)&sin, &slen)) == -1)
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err(-1, "accept");
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if (close(s))
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err(-1, "close");
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uint a = (sin.sin_addr.s_addr >> 0) & 0xff;
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uint b = (sin.sin_addr.s_addr >> 8) & 0xff;
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uint c = (sin.sin_addr.s_addr >> 16) & 0xff;
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uint d = (sin.sin_addr.s_addr >> 24) & 0xff;
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fprintf(stderr, "connection from %u.%u.%u.%u:%d\n", a, b, c, d,
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(int)ntohs(sin.sin_port));
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return ret;
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}
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// latency debugging code
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//ulong allw[100];
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//
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//void dump(ulong *worst)
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//{
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// for (int i = 0; i < 100; i++)
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// printf("%d: %lu\n", i, worst[i]);
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// printf("\n");
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//}
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//
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//void insert(ulong *worst, ulong n)
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//{
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// if (n < worst[0])
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// return;
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// if (n > worst[99]) {
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// int i = 99;
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// memmove(worst, worst + 1, i*sizeof(worst[0]));
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// worst[i] = n;
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// return;
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// }
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// for (int i = 0; i < 99; i++) {
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// if (n > worst[i] && n <= worst[i+1]) {
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// memmove(worst, worst + 1, i*sizeof(worst[0]));
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// worst[i] = n;
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// return;
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// }
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// }
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//}
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int main(int argc, char **argv)
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{
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// bring all file metadaa and binary text/data into the page cache in
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// hopes that the kernel won't mix blocks from the new image with
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// blocks from the old.
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int status;
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switch (fork()) {
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case 0:
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{
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int fd = open("/dev/null", O_WRONLY);
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if (fd == -1)
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err(-1, "open");
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if (dup2(fd, 1) == -1)
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err(-1, "dup2");
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close(fd);
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char * const args[] = {"/bin/cat", "/bin/bimage", NULL};
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execv(args[0], args);
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err(-1, "execv");
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}
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case -1:
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err(-1, "fork");
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default:
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if (wait(&status) == -1)
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err(-1, "wait");
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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errx(-1, "child failed");
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}
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int fd;
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if ((fd = open("/dev/rsd0c", O_WRONLY)) == -1)
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err(-1, "open");
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int s = lstn(31338);
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sync();
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const int blksz = 4096;
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char buf[blksz];
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size_t did = 0;
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int mb = 1;
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for (;;) {
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ssize_t bs = 0;
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ssize_t r = 0;
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while (bs != blksz &&
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(r = read(s, buf + bs, sizeof(buf) - bs)) > 0)
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bs += r;
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if (r == -1)
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err(-1, "read");
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if (bs == 0)
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break;
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if ((did % blksz) != 0)
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fprintf(stderr, "slow write\n");
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if (write(fd, buf, bs) != bs)
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err(-1, "write");
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did += bs;
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if (did >> 20 >= mb) {
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fprintf(stderr, "%dMB\n", mb);
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mb += 1;
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}
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}
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if (fsync(fd) == -1)
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err(-1, "fsync");
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if (close(s) == -1)
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err(-1, "close");
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if (close(fd) == -1)
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err(-1, "close");
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fprintf(stderr, "wrote %zu bytes. rebooting.\n", did);
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reboot();
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return 0;
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}
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