source: benchmark/io/sendfile/consumer.c @ 6009a5a

// Simple sink program that opens a tcp socket on a random port
// and then reads everything the socket has to write and then ends.

#define _GNU_SOURCE

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <errno.h>
#include <time.h>
#include <unistd.h>

#include <sys/socket.h>
#include <netinet/in.h>

enum {
        USAGE_ERROR = 1,
        SOCKET_ERROR,
        BIND_INUSE,
        BIND_ERROR,
        GETNAME_ERROR,
        LISTEN_ERROR,
        ACCEPT_ERROR,
        READ_ERROR
};

enum { buffer_len = 10240 };
char buffer[buffer_len];

enum { TIMEGRAN = 1000000000LL };

int main(int argc, char * argv[]) {
        int port = 0;
        switch(argc) {
        case 1: break;
        case 2:
                {
                        const char * const str = argv[1];
                        char* endptr;
                        unsigned long long ret = strtoul(str, &endptr, 10);
                        if('\0' != *endptr) { fprintf( stderr, "Invalid argument \"%s\" (not a number)\n", str ); goto USAGE;}
                        if(errno == ERANGE || ret > 65535)  { fprintf( stderr, "Invalid argument \"%s\" (value too large)\n", str ); goto USAGE;}

                        port = ret;
                        break;
                }
        USAGE:
        default:
                fprintf( stderr, "USAGE: %s [port]\n", argv[0] );
                exit( USAGE_ERROR );
        }

        printf( "%d: Listening on port %d\n", getpid(), port );
        int listenfd = socket(AF_INET, SOCK_STREAM, 0);
        if(listenfd < 0) {
                fprintf( stderr, "socket error: (%d) %s\n", (int)errno, strerror(errno) );
                exit( SOCKET_ERROR );
        }

        int ret = 0;
        struct sockaddr_in address;
        socklen_t addrlen = sizeof(address);
        memset( (char *)&address, '\0', addrlen );
        address.sin_family = AF_INET;
        address.sin_addr.s_addr = htonl( INADDR_ANY );
        address.sin_port = htons( port );

        ret = bind( listenfd, (struct sockaddr *) &address, addrlen );
        if(ret < 0) {
                if(errno == EADDRINUSE) {
                        fprintf( stderr, "Port already in use in non-interactive mode. Aborting\n" );
                        exit( BIND_INUSE );
                }
                fprintf( stderr, "bind error: (%d) %s\n", (int)errno, strerror(errno) );
                exit( BIND_ERROR );
        }

        ret = getsockname( listenfd, (struct sockaddr *) &address, &addrlen );
        if(ret < 0) {
                fprintf( stderr, "getname error: (%d) %s\n", (int)errno, strerror(errno) );
                exit(GETNAME_ERROR);
        }

        printf( "actial port: %d\n", ntohs(address.sin_port) );

        ret = listen( listenfd, 1 );
        if(ret < 0) {
                fprintf( stderr, "listen error: (%d) %s\n", (int)errno, strerror(errno) );
                exit( 5 );
        }

        for(;;) {
                struct sockaddr_in cli_addr;
                __socklen_t clilen = sizeof(cli_addr);
                int fd = accept( listenfd, (struct sockaddr *) &cli_addr, &clilen );
                if(fd < 0) {
                        fprintf( stderr, "accept error: (%d) %s\n", (int)errno, strerror(errno) );
                        exit( ACCEPT_ERROR );
                }

                int error = 0;
                size_t calls = 0;
                size_t bytes = 0;

                struct timespec after, before;

                clock_gettime(CLOCK_MONOTONIC, &before);

                for(;;) {
                        ret = recv(fd, buffer, buffer_len, 0);
                        if(ret == 0 ) goto EXIT;
                        if(ret < 0 ) {
                                if( errno == EAGAIN || errno == EWOULDBLOCK) continue;
                                if( errno == ECONNRESET ) { printf("Connection reset\n"); goto EXIT; }
                                if( errno == EPIPE ) { printf("Pipe closed\n"); goto EXIT; }
                                fprintf( stderr, "accept error: (%d) %s\n", (int)errno, strerror(errno) );
                                error = READ_ERROR;
                                goto EXIT;
                        }
                        calls++;
                        bytes += ret;
                }
                EXIT:;

                clock_gettime(CLOCK_MONOTONIC, &after);

                uint64_t tb = ((int64_t)before.tv_sec * TIMEGRAN) + before.tv_nsec;
                uint64_t ta = ((int64_t)after.tv_sec * TIMEGRAN) + after.tv_nsec;
                double secs = ((double)ta - tb) / TIMEGRAN;

                printf("Received %'zu bytes in %'zu reads, %f seconds\n", bytes, calls, secs);
                printf(" - %'3.3f bytes per second\n", (((double)bytes) / secs));
                printf(" - %'3.3f bytes per calls\n", (((double)bytes) / calls));

                close(fd);
                if(error != 0) exit( error );
        }
        close(listenfd);
        return 0;
}