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

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• tests/test-pwrite.c

• /* Test the pwrite function.
     Copyright (C) 2009-2025 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 (pwrite, ssize_t, (int, const void *, size_t, off_t));
  
  #include <sys/types.h>
  #include <fcntl.h>
  #include <errno.h>
  #include <string.h>
  
  #include "macros.h"
  
  #define N (sizeof buf - 1)
  
  int
  main (void)
  {
    char const *file = "out";
    int fd;
    char buf[] = "0123456789";
    off_t pos = 2;
    size_t i;
    off_t init_pos;
  
    ASSERT (file);
  
    fd = open (file, O_CREAT | O_WRONLY, 0600);
    ASSERT (0 <= fd);
    ASSERT (write (fd, buf, N) == N);
    ASSERT (close (fd) == 0);
  
    fd = open (file, O_WRONLY, 0600);
    ASSERT (0 <= fd);
  
    init_pos = lseek (fd, pos, SEEK_SET);
    ASSERT (init_pos == pos);
  
    for (i = 0; i < N; i+=2)
      {
        const char byte = 'W';
        ASSERT (pwrite (fd, &byte, 1, i) == 1);
        ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos);
      }
  
    {
      /* Invalid offset must evoke failure with EINVAL.  */
      const char byte = 'b';
      ASSERT (pwrite (fd, &byte, 1, (off_t) -1) == -1);
      ASSERT (errno == EINVAL);
    }
  
    ASSERT (close (fd) == 0);
  
    {
      fd = open (file, O_RDONLY);
      ASSERT (0 <= fd);
      ASSERT (read (fd, buf, N) == N);
      ASSERT (close (fd) == 0);
      ASSERT (strcmp ("W1W3W5W7W9",buf) == 0);
    }
  
    /* Test behaviour for invalid file descriptors.  */
    {
      char byte = 'x';
      errno = 0;
      ASSERT (pwrite (-1, &byte, 1, 0) == -1);
      ASSERT (errno == EBADF);
    }
    {
      char byte = 'x';
      close (99);
      errno = 0;
      ASSERT (pwrite (99, &byte, 1, 0) == -1);
      ASSERT (errno == EBADF);
    }
  
    return test_exit_status;
  }
  

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