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/** |
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* Measure data transferred by a process. |
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* |
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* Used with LD_PRELOAD. |
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*/ |
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|
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#define _GNU_SOURCE |
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#include <dlfcn.h> |
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#include <stdbool.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <time.h> |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/stat.h> |
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|
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static unsigned long long total_sent = 0; |
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static unsigned long long total_recv = 0; |
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static time_t start_time; |
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|
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static void transfcount_init(void); |
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static void transfcount_atexit(void); |
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static void transfcount_print_bytes(unsigned long long n); |
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|
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typedef ssize_t (*send_type)(int sockfd, const void *buf, size_t len, |
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int flags); |
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typedef int (*sendmmsg_type)(int sockfd, struct mmsghdr *msgvec, |
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unsigned int vlen, int flags); |
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typedef ssize_t (*recv_type)(int sockfd, void *buf, size_t len, int flags); |
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typedef ssize_t (*read_type)(int fd, void *buf, size_t count); |
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typedef ssize_t (*write_type)(int fd, const void *buf, size_t count); |
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|
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static send_type orig_send; |
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static sendmmsg_type orig_sendmmsg; |
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static recv_type orig_recv; |
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static read_type orig_read; |
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static write_type orig_write; |
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|
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|
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/** |
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* send - send a message on a socket. |
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*/ |
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ssize_t send(int sockfd, const void *buf, size_t len, int flags) |
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{ |
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ssize_t bytes; |
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|
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transfcount_init(); |
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|
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/*printf("######## send(sockfd=%i, buf=%p, len=%zi, flags=%x) -> ", |
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sockfd, buf, len, flags);*/ |
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|
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bytes = orig_send(sockfd, buf, len, flags); |
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total_sent += bytes; |
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/*printf("%lu\n", bytes);*/ |
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|
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return bytes; |
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} |
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|
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|
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/** |
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* sendmmsg - send multiple messages on a socket. |
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*/ |
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int sendmmsg(int sockfd, struct mmsghdr *msgvec, unsigned int vlen, |
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int flags) |
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{ |
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int sent, i; |
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|
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transfcount_init(); |
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|
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/*printf("######## sendmmsg(sockfd=%i, msgvec=%p, vlen=%u, flags=%x) -> ", |
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sockfd, msgvec, vlen, flags);*/ |
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|
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sent = orig_sendmmsg(sockfd, msgvec, vlen, flags); |
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/*printf("%i\n", sent);*/ |
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for (i = 0; i < sent; i++) |
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total_sent += msgvec[i].msg_len; |
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|
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return sent; |
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} |
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|
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|
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/** |
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* recv - receive a message from a socket. |
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*/ |
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ssize_t recv(int sockfd, void *buf, size_t len, int flags) |
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{ |
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ssize_t bytes; |
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|
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transfcount_init(); |
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|
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/*printf("######## recv(sockfd=%i, buf=%p, len=%zi, flags=%x) -> ", |
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sockfd, buf, len, flags);*/ |
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|
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bytes = orig_recv(sockfd, buf, len, flags); |
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total_recv += bytes; |
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/*printf("%lu\n", bytes);*/ |
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|
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return bytes; |
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} |
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|
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|
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/** |
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* read - read from a file descriptor. |
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*/ |
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ssize_t read(int fd, void *buf, size_t count) |
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{ |
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struct stat statbuf; |
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ssize_t bytes; |
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|
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transfcount_init(); |
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|
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fstat(fd, &statbuf); |
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if (!S_ISSOCK(statbuf.st_mode)) |
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return orig_read(fd, buf, count); |
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|
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/*printf("######## read(fd=%i, buf=%p, count=%zi) -> ", |
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fd, buf, count);*/ |
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|
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bytes = orig_read(fd, buf, count); |
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if (bytes != -1) |
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total_recv += bytes; |
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/*printf("%lu\n", bytes);*/ |
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|
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return bytes; |
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} |
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|
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|
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/** |
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* write - write to a file descriptor. |
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*/ |
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ssize_t write(int fd, const void *buf, size_t count) |
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{ |
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struct stat statbuf; |
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ssize_t bytes; |
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|
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transfcount_init(); |
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|
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fstat(fd, &statbuf); |
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if (!S_ISSOCK(statbuf.st_mode)) |
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return orig_write(fd, buf, count); |
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|
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/*printf("######## write(fd=%i, buf=%p, count=%zi) -> ", |
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fd, buf, count);*/ |
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|
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bytes = orig_write(fd, buf, count); |
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if (bytes != -1) |
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total_sent += bytes; |
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/*printf("%lu\n", bytes);*/ |
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|
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return bytes; |
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} |
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|
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|
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/** |
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* Set up library. |
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*/ |
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void transfcount_init(void) |
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{ |
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static bool init_done = false; |
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|
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if (init_done) |
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return; |
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|
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orig_send = (send_type)dlsym(RTLD_NEXT, "send"); |
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orig_sendmmsg = (sendmmsg_type)dlsym(RTLD_NEXT, "sendmmsg"); |
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orig_recv = (recv_type)dlsym(RTLD_NEXT, "recv"); |
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orig_read = (read_type)dlsym(RTLD_NEXT, "read"); |
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orig_write = (write_type)dlsym(RTLD_NEXT, "write"); |
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|
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atexit(transfcount_atexit); |
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|
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start_time = time(NULL); |
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|
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init_done = true; |
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} |
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|
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|
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/** |
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* Output transfer statistics. |
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*/ |
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void transfcount_atexit(void) |
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{ |
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time_t end_time = time(NULL); |
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time_t duration = end_time - start_time; |
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|
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if (total_sent == 0 && total_recv == 0) |
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return; |
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|
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if (duration == 0) |
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duration = 1; |
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|
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fprintf(stderr, "[>>> Sent "); |
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transfcount_print_bytes(total_sent); |
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fprintf(stderr, "B ("); |
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transfcount_print_bytes(total_sent / duration); |
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fprintf(stderr, "B/s) >>>] [<<< Received "); |
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transfcount_print_bytes(total_recv); |
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fprintf(stderr, "B ("); |
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transfcount_print_bytes(total_recv / duration); |
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fprintf(stderr, "B/s) <<<]\n"); |
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} |
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|
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|
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/** |
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* Print a size as human readable. |
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*/ |
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void transfcount_print_bytes(unsigned long long n) |
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{ |
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if (1024 * 1024 * 1024 <= n) { |
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fprintf(stderr, "%.1fGi", (double) n / 1024 / 1024 / 1024); |
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} else if (1024 * 1024 <= n) { |
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fprintf(stderr, "%.1fMi", (double) n / 1024 / 1024); |
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} else if (1024 <= n) { |
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fprintf(stderr, "%.1fKi", (double) n / 1024); |
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} else { |
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fprintf(stderr, "%llu", n); |
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} |
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} |
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