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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;
int zfd;
int pfd[2];
size_t total = 0;
if (argc != 4) {
fprintf(stderr, "Usage: %s <addr> <port> <64k count>\n", argv[0]);
exit(EXIT_FAILURE);
}
sfd = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 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]);
if (connect(sfd, &addr, sizeof(addr)) < 0) {
perror("connect");
exit(EXIT_FAILURE);
}
zfd = open("/dev/zero", O_RDONLY | O_CLOEXEC);
if (zfd < 0) {
perror("open");
exit(EXIT_FAILURE);
}
if (pipe2(pfd, O_CLOEXEC) < 0) {
perror("pipe2");
exit(EXIT_FAILURE);
}
for (int i = 0; i < atoi(argv[3]); i++) {
ssize_t r, w;
r = splice(zfd, NULL, pfd[PIPE_WR], NULL, 64 * 1024, SPLICE_F_MOVE);
//fprintf(stderr, "Read %zi bytes from /dev/zero\n", r);
w = splice(pfd[PIPE_RD], NULL, sfd, NULL, r, SPLICE_F_MOVE);
//fprintf(stderr, "Wrote %zi bytes to socket\n", w);
if (r != w) {
fprintf(stderr, "Read/write mismatch\n");
exit(EXIT_FAILURE);
}
total += w;
}
printf("Client: sent %zu bytes\n", total);
exit(EXIT_SUCCESS);
}
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