kc3-lang/gnulib/lib/safe-read.c

• Show log

  Commit

• Hash : 552a680f
  Author :
  Date : 2003-05-29T07:21:59
  

  in lib:
  
  	* addext.c, backupfile.c, fsusage.c, human.c, pathmax.h,
  	rpmatch.c, userspec.c, xreadlink.c, xstrtol.c: Include <limits.h>
  	without checking for HAVE_LIMITS_H.
  	* backupfile.c, fsusage.c, hash.c, human.c, safe-read.c, userspec.c,
  	xstrtol.c (CHAR_BIT) : Don't define, since <limits.h> is guaranteed
  	to do that.
  	* fatal.c: Include <stdarg.h> without checking for __STDC__.
  	* exclude.c: Include <stdbool.h> unconditionally.
  	* tempname.c: Include <stddef.h> unconditionally.
  	* hash.c: Include <limits.h>, since we no longer define CHAR_BIT.
  	* modechange.c, rpmatch.c (NULL): Don't define, since
  	<stddef.h> does that.
  	* quote.c: Dont include <stddef.h> or <sys/types.h>; not needed.
  	* safe-read.c (INT_MAX): Don't define, since <limits.h> does that.
  	* safe-read.c (TYPE_MINIMUM, TYPE_MAXIMUM): Remove; no longer needed.
  	* xstrtol.c: Likewise.
  	* safe-read.c: Remove TYPE_SIGNED; no longer needed.
  	* savedir.c: Include <stddef.h> instead of defining NULL.
  
  in m4:
  
  	* backupfile.m4 (gl_BACKUPFILE): Don't check for limits.h.
  	* fsusage.m4 (gl_PREREQ_FSUSAGE_EXTRA): Likewise.
  	* human.m4 (gl_HUMAN): Likewise.
  	* pathmax.m4 (gl_PATHMAX): Likewise.
  	* rpmatch.m4 (gl_FUNC_RPMATCH): Likewise.
  	* userspec.m4 (gl_USERSPEC): Likewise.
  	* xreadlink.m4 (gl_XREADLINK): Likewise.
  	* m4/xstrtol.m4 (gl_PREREQ_XSTRTOL): Likewise.
  	* quote.m4 (gl_QUOTE): Don't check for stddef.h.
  

Download

• lib/safe-read.c

• /* An interface to read and write that retries after interrupts.
     Copyright (C) 1993, 1994, 1998, 2002-2003 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 2, 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, write to the Free Software Foundation,
     Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  
  #if HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  /* Specification.  */
  #ifdef SAFE_WRITE
  # include "safe-write.h"
  #else
  # include "safe-read.h"
  #endif
  
  /* Get ssize_t.  */
  #include <sys/types.h>
  #if HAVE_UNISTD_H
  # include <unistd.h>
  #endif
  
  #include <errno.h>
  #ifndef errno
  extern int errno;
  #endif
  
  #ifdef EINTR
  # define IS_EINTR(x) ((x) == EINTR)
  #else
  # define IS_EINTR(x) 0
  #endif
  
  #include <limits.h>
  
  #ifdef SAFE_WRITE
  # define safe_rw safe_write
  # define rw write
  #else
  # define safe_rw safe_read
  # define rw read
  # undef const
  # define const /* empty */
  #endif
  
  /* Read(write) up to COUNT bytes at BUF from(to) descriptor FD, retrying if
     interrupted.  Return the actual number of bytes read(written), zero for EOF,
     or SAFE_READ_ERROR(SAFE_WRITE_ERROR) upon error.  */
  size_t
  safe_rw (int fd, void const *buf, size_t count)
  {
    ssize_t result;
  
    /* POSIX limits COUNT to SSIZE_MAX, but we limit it further, requiring
       that COUNT <= INT_MAX, to avoid triggering a bug in Tru64 5.1.
       When decreasing COUNT, keep the file pointer block-aligned.
       Note that in any case, read(write) may succeed, yet read(write)
       fewer than COUNT bytes, so the caller must be prepared to handle
       partial results.  */
    if (count > INT_MAX)
      count = INT_MAX & ~8191;
  
    do
      {
        result = rw (fd, buf, count);
      }
    while (result < 0 && IS_EINTR (errno));
  
    return (size_t) result;
  }
  

Download