| 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 buffer_info { |
| 14 | char *name; |
| 15 | pid_t pid; |
| 16 | |
| 17 | int shmid; |
| 18 | void *mem; |
| 19 | int memlen; |
| 20 | |
| 21 | int nsubbufs; |
| 22 | }; |
| 23 | |
| 24 | int add_buffer(pid_t pid, char *bufname) |
| 25 | { |
| 26 | struct buffer_info *buf; |
| 27 | char *send_msg; |
| 28 | char *received_msg; |
| 29 | int result; |
| 30 | |
| 31 | buf = (struct buffer_info *) malloc(sizeof(struct buffer_info)); |
| 32 | if(buf == NULL) { |
| 33 | ERR("add_buffer: insufficient memory"); |
| 34 | return -1; |
| 35 | } |
| 36 | |
| 37 | buf->name = bufname; |
| 38 | buf->pid = pid; |
| 39 | |
| 40 | /* get shmid */ |
| 41 | asprintf(&send_msg, "get_shmid %s", buf->name); |
| 42 | send_message(pid, send_msg, &received_msg); |
| 43 | free(send_msg); |
| 44 | |
| 45 | result = sscanf(received_msg, "%d", &buf->shmid); |
| 46 | if(result != 1) { |
| 47 | ERR("unable to parse response to get_shmid"); |
| 48 | return -1; |
| 49 | } |
| 50 | free(received_msg); |
| 51 | |
| 52 | /* get nsubbufs */ |
| 53 | asprintf(&send_msg, "get_n_subbufs %s", buf->name); |
| 54 | send_message(pid, send_msg, &received_msg); |
| 55 | free(send_msg); |
| 56 | |
| 57 | result = sscanf(received_msg, "%d", &buf->nsubbufs); |
| 58 | if(result != 1) { |
| 59 | ERR("unable to parse response to get_shmid"); |
| 60 | return -1; |
| 61 | } |
| 62 | free(received_msg); |
| 63 | |
| 64 | /* attach memory */ |
| 65 | buf->mem = shmat(buf->shmid, NULL, 0); |
| 66 | if(buf->mem == (void *) 0) { |
| 67 | perror("shmat"); |
| 68 | return -1; |
| 69 | } |
| 70 | |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | int main(int argc, char **argv) |
| 75 | { |
| 76 | struct ustcomm_ustd ustd; |
| 77 | int result; |
| 78 | |
| 79 | result = ustcomm_init_ustd(&ustd); |
| 80 | if(result == -1) { |
| 81 | ERR("failed to initialize socket"); |
| 82 | return 1; |
| 83 | } |
| 84 | |
| 85 | for(;;) { |
| 86 | char *recvbuf; |
| 87 | |
| 88 | ustcomm_ustd_recv_message(&ustd, &recvbuf, NULL); |
| 89 | |
| 90 | if(!strncmp(recvbuf, "collect", 7)) { |
| 91 | pid_t pid; |
| 92 | char *bufname; |
| 93 | int result; |
| 94 | |
| 95 | result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname); |
| 96 | if(result != 2) { |
| 97 | fprintf(stderr, "parsing error: %s\n", recvbuf); |
| 98 | } |
| 99 | |
| 100 | add_buffer(pid, bufname); |
| 101 | |
| 102 | } |
| 103 | |
| 104 | free(recvbuf); |
| 105 | } |
| 106 | |
| 107 | return 0; |
| 108 | } |