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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdbool.h>
#define PIPE_RD 0
#define PIPE_WR 1
int
main(int argc, char **argv) {
int sfd;
struct sockaddr_in addr;
socklen_t addrsz = sizeof(addr);
int pfd[2];
int r;
int cfd;
int zfd;
size_t total = 0;
if (argc != 3) {
fprintf(stderr, "Usage: %s <addr> <port>\n", argv[0]);
exit(EXIT_FAILURE);
}
sfd = socket(AF_INET, SOCK_STREAM, 0);
if (sfd < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(atoi(argv[2]));
addr.sin_addr.s_addr = inet_addr(argv[1]);
int enable = 1;
if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) < 0) {
perror("setsockopt");
exit(EXIT_FAILURE);
}
r = bind(sfd, (struct sockaddr *)&addr, sizeof(addr));
if (r < 0) {
perror("bind");
exit(EXIT_FAILURE);
}
r = listen(sfd, 100);
if (r < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
cfd = accept4(sfd, (struct sockaddr *)&addr, &addrsz, SOCK_CLOEXEC);
if (cfd < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
zfd = open("/dev/null", O_WRONLY | O_CLOEXEC);
if (zfd < 0) {
perror("open");
exit(EXIT_FAILURE);
}
if (pipe2(pfd, O_CLOEXEC) < 0) {
perror("pipe2");
exit(EXIT_FAILURE);
}
while (true) {
ssize_t r, w;
r = splice(cfd, NULL, pfd[PIPE_WR], NULL, 64 * 1024, SPLICE_F_MOVE);
if (r < 0)
perror("splice");
//fprintf(stderr, "Read %zi bytes from socket\n", r);
if (r == 0)
break;
w = splice(pfd[PIPE_RD], NULL, zfd, NULL, r, SPLICE_F_MOVE);
if (w < 0)
perror("splice");
if (w != r) {
fprintf(stderr, "Losing bytes\n");
exit(EXIT_FAILURE);
}
//fprintf(stderr, "Wrote %zi bytes to /dev/null\n", r);
total += w;
}
printf("Server: received %zu bytes\n", total);
}
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