ctdb/tests/src/line_test.c

   1 /*
   2    Test code for line based I/O over fds
   3
   4    Copyright (C) Amitay Isaacs  2018
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "replace.h"
  21 #include "system/filesys.h"
  22
  23 #include <talloc.h>
  24 #include <assert.h>
  25
  26 #include "common/line.c"
  27
  28 static int line_print(char *line, void *private_data)
  29 {
  30         printf("%s\n", line);
  31         fflush(stdout);
  32
  33         return 0;
  34 }
  35
  36 int main(int argc, const char **argv)
  37 {
  38         TALLOC_CTX *mem_ctx;
  39         size_t hint = 32;
  40         pid_t pid;
  41         int ret, lines = 0;
  42         int pipefd[2];
  43
  44         if (argc < 2 || argc > 3) {
  45                 fprintf(stderr, "Usage: %s <filename> [<hint>]\n", argv[0]);
  46                 exit(1);
  47         }
  48
  49         if (argc == 3) {
  50                 long value;
  51
  52                 value = atol(argv[2]);
  53                 assert(value > 0);
  54                 hint = value;
  55         }
  56
  57         ret = pipe(pipefd);
  58         assert(ret == 0);
  59
  60         pid = fork();
  61         assert(pid != -1);
  62
  63         if (pid == 0) {
  64                 char buffer[16];
  65                 ssize_t n, n2;
  66                 int fd;
  67
  68                 close(pipefd[0]);
  69
  70                 fd = open(argv[1], O_RDONLY);
  71                 assert(fd != -1);
  72
  73                 while (1) {
  74                         n = read(fd, buffer, sizeof(buffer));
  75                         assert(n >= 0 && n <= sizeof(buffer));
  76
  77                         if (n == 0) {
  78                                 break;
  79                         }
  80
  81                         n2 = write(pipefd[1], buffer, n);
  82                         assert(n2 == n);
  83                 }
  84
  85                 close(pipefd[1]);
  86                 close(fd);
  87
  88                 exit(0);
  89         }
  90
  91         close(pipefd[1]);
  92
  93         mem_ctx = talloc_new(NULL);
  94         assert(mem_ctx != NULL);
  95
  96         ret = line_read(pipefd[0], hint, NULL, line_print, NULL, &lines);
  97         assert(ret == 0);
  98
  99         talloc_free(mem_ctx);
 100
 101         return lines;
 102 }