tests/test-dummytrace.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include <fcntl.h>
   4 #include <sys/mman.h>
   5 #include <stdio.h>
   6 #include <stdint.h>
   7 #include <unistd.h>
   8 #include <errno.h>
   9 #include <uuid/uuid.h>
  10 #include <string.h>
  11
  12 #define FILE_LEN        (4 * 4096)
  13
  14 int main(int argc, char **argv)
  15 {
  16         char *base, *pos;
  17         int fd, ret;
  18         off_t off;
  19         uuid_t uuid;
  20
  21         fd = open("dummystream", O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
  22         if (fd < 0) {
  23                 perror("open");
  24                 return -1;
  25         }
  26         off = posix_fallocate(fd, 0, FILE_LEN);
  27         if (off < 0) {
  28                 printf("Error in fallocate\n");
  29                 return -1;
  30         }
  31 #if 0
  32         {
  33                 ssize_t len;
  34
  35                 off = lseek(fd, FILE_LEN - 1, SEEK_CUR);
  36                 if (off < 0) {
  37                         perror("lseek");
  38                         return -1;
  39                 }
  40                 len = write(fd, "", 1);
  41                 if (len < 0) {
  42                         perror("write");
  43                         return -1;
  44                 }
  45         }
  46 #endif
  47         base = mmap(NULL, FILE_LEN, PROT_READ|PROT_WRITE,
  48                 MAP_SHARED, fd, 0);
  49         if (!base) {
  50                 perror("mmap");
  51                 return -1;
  52         }
  53         pos = base;
  54
  55         /* magic */
  56         *(uint32_t *) pos = 0xC1FC1FC1;
  57         pos += sizeof(uint32_t);
  58
  59         /* trace_uuid */
  60         ret = uuid_parse("2a6422d0-6cee-11e0-8c08-cb07d7b3a564", uuid);
  61         if (ret) {
  62                 printf("uuid parse error\n");
  63                 return -1;
  64         }
  65         memcpy(pos, uuid, 16);
  66         pos += 16;
  67
  68         /* stream_id */
  69         *(uint32_t *) pos = 0;
  70         pos += sizeof(uint32_t);
  71
  72         ret = munmap(base, FILE_LEN);
  73         if (ret) {
  74                 perror("munmap");
  75                 return -1;
  76         }
  77         close(fd);
  78         return 0;
  79 }
  80
  81