| 1 | #define _GNU_SOURCE |
| 2 | |
| 3 | #include <sys/types.h> |
| 4 | #include <sys/shm.h> |
| 5 | |
| 6 | #include <stdlib.h> |
| 7 | #include <stdio.h> |
| 8 | #include <string.h> |
| 9 | |
| 10 | #include "localerr.h" |
| 11 | #include "ustcomm.h" |
| 12 | |
| 13 | struct list_head buffers = LIST_HEAD_INIT(buffers); |
| 14 | |
| 15 | struct buffer_info { |
| 16 | char *name; |
| 17 | pid_t pid; |
| 18 | |
| 19 | int shmid; |
| 20 | void *mem; |
| 21 | int memlen; |
| 22 | |
| 23 | int n_subbufs; |
| 24 | int subbuf_size; |
| 25 | |
| 26 | int file_fd; /* output file */ |
| 27 | }; |
| 28 | |
| 29 | int add_buffer(pid_t pid, char *bufname) |
| 30 | { |
| 31 | struct buffer_info *buf; |
| 32 | char *send_msg; |
| 33 | char *received_msg; |
| 34 | int result; |
| 35 | |
| 36 | buf = (struct buffer_info *) malloc(sizeof(struct buffer_info)); |
| 37 | if(buf == NULL) { |
| 38 | ERR("add_buffer: insufficient memory"); |
| 39 | return -1; |
| 40 | } |
| 41 | |
| 42 | buf->name = bufname; |
| 43 | buf->pid = pid; |
| 44 | |
| 45 | /* get shmid */ |
| 46 | asprintf(&send_msg, "get_shmid %s", buf->name); |
| 47 | send_message(pid, send_msg, &received_msg); |
| 48 | free(send_msg); |
| 49 | DBG("got buffer name %s", buf->name); |
| 50 | |
| 51 | result = sscanf(received_msg, "%d", &buf->shmid); |
| 52 | if(result != 1) { |
| 53 | ERR("unable to parse response to get_shmid"); |
| 54 | return -1; |
| 55 | } |
| 56 | free(received_msg); |
| 57 | DBG("got shmid %d", buf->shmid); |
| 58 | |
| 59 | /* get n_subbufs */ |
| 60 | asprintf(&send_msg, "get_n_subbufs %s", buf->name); |
| 61 | send_message(pid, send_msg, &received_msg); |
| 62 | free(send_msg); |
| 63 | |
| 64 | result = sscanf(received_msg, "%d", &buf->n_subbufs); |
| 65 | if(result != 1) { |
| 66 | ERR("unable to parse response to get_n_subbufs"); |
| 67 | return -1; |
| 68 | } |
| 69 | free(received_msg); |
| 70 | DBG("got n_subbufs %d", buf->n_subbufs); |
| 71 | |
| 72 | /* get subbuf size */ |
| 73 | asprintf(&send_msg, "get_subbuf_size %s", buf->name); |
| 74 | send_message(pid, send_msg, &received_msg); |
| 75 | free(send_msg); |
| 76 | |
| 77 | result = sscanf(received_msg, "%d", &buf->subbuf_size); |
| 78 | if(result != 1) { |
| 79 | ERR("unable to parse response to get_subbuf_size"); |
| 80 | return -1; |
| 81 | } |
| 82 | free(received_msg); |
| 83 | DBG("got subbuf_size %d", buf->subbuf_size); |
| 84 | |
| 85 | /* attach memory */ |
| 86 | buf->mem = shmat(buf->shmid, NULL, 0); |
| 87 | if(buf->mem == (void *) 0) { |
| 88 | perror("shmat"); |
| 89 | return -1; |
| 90 | } |
| 91 | DBG("successfully attached memory"); |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | int main(int argc, char **argv) |
| 97 | { |
| 98 | struct ustcomm_ustd ustd; |
| 99 | int result; |
| 100 | |
| 101 | result = ustcomm_init_ustd(&ustd); |
| 102 | if(result == -1) { |
| 103 | ERR("failed to initialize socket"); |
| 104 | return 1; |
| 105 | } |
| 106 | |
| 107 | for(;;) { |
| 108 | char *recvbuf; |
| 109 | |
| 110 | ustcomm_ustd_recv_message(&ustd, &recvbuf, NULL); |
| 111 | |
| 112 | if(!strncmp(recvbuf, "collect", 7)) { |
| 113 | pid_t pid; |
| 114 | char *bufname; |
| 115 | int result; |
| 116 | |
| 117 | result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname); |
| 118 | if(result != 2) { |
| 119 | fprintf(stderr, "parsing error: %s\n", recvbuf); |
| 120 | } |
| 121 | |
| 122 | add_buffer(pid, bufname); |
| 123 | |
| 124 | } |
| 125 | |
| 126 | free(recvbuf); |
| 127 | } |
| 128 | |
| 129 | return 0; |
| 130 | } |