kc3-lang/gnulib/tests/test-read.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• tests/test-read.c

• /* Test the read() function.
     Copyright (C) 2011-2023 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  #include <unistd.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (read, ssize_t, (int, void *, size_t));
  
  #include <errno.h>
  #include <fcntl.h>
  #include <string.h>
  
  #include "macros.h"
  
  int
  main (void)
  {
    const char *filename = "test-read.tmp";
    int fd;
  
    /* Create a file with a simple contents.  */
    fd = open (filename, O_CREAT | O_WRONLY, 0600);
    ASSERT (fd >= 0);
    ASSERT (write (fd, "Hello World", 11) == 11);
    ASSERT (close (fd) == 0);
  
    /* Read from the middle of the file.  */
    fd = open (filename, O_RDONLY);
    ASSERT (fd >= 0);
    ASSERT (lseek (fd, 6, SEEK_SET) == 6);
    {
      char buf[10];
      ssize_t ret = read (fd, buf, 10);
      ASSERT (ret == 5);
      ASSERT (memcmp (buf, "World", 5) == 0);
    }
    ASSERT (close (fd) == 0);
  
    /* Test behaviour for invalid file descriptors.  */
    {
      char byte;
      errno = 0;
      ASSERT (read (-1, &byte, 1) == -1);
      ASSERT (errno == EBADF);
    }
    {
      char byte;
      close (99);
      errno = 0;
      ASSERT (read (99, &byte, 1) == -1);
      ASSERT (errno == EBADF);
    }
  
    /* Clean up.  */
    unlink (filename);
  
    return 0;
  }
  

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