IABSD.fr/src/lib/libevent/evutil.c

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• Author : deraadt
  Date : 2019-06-28 13:32:41
  Hash : df69c215
  Message : When system calls indicate an error they return -1, not some arbitrary value < 0. errno is only updated in this case. Change all (most?) callers of syscalls to follow this better, and let's see if this strictness helps us in the future.

• lib/libevent/evutil.c

• /*	$OpenBSD: evutil.c,v 1.11 2019/06/28 13:32:42 deraadt Exp $	*/
  
  /*
   * Copyright (c) 2007 Niels Provos <provos@citi.umich.edu>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <sys/queue.h>
  
  #include <unistd.h>
  #include <fcntl.h>
  #include <stdlib.h>
  #include <errno.h>
  #include <stdio.h>
  #include <signal.h>
  
  #include "event.h"
  #include "event-internal.h"
  #include "evutil.h"
  #include "log.h"
  
  int
  evutil_socketpair(int family, int type, int protocol, int fd[2])
  {
  	return socketpair(family, type, protocol, fd);
  }
  
  int
  evutil_make_socket_nonblocking(int fd)
  {
  	int flags;
  
  	if ((flags = fcntl(fd, F_GETFL)) == -1) {
  		event_warn("fcntl(%d, F_GETFL)", fd);
  		return -1;
  	}
  	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
  		event_warn("fcntl(%d, F_SETFL)", fd);
  		return -1;
  	}
  	return 0;
  }
  
  ev_int64_t
  evutil_strtoll(const char *s, char **endptr, int base)
  {
  	return (ev_int64_t)strtoll(s, endptr, base);
  }
  
  int
  evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
  {
  	int r;
  	va_list ap;
  	va_start(ap, format);
  	r = evutil_vsnprintf(buf, buflen, format, ap);
  	va_end(ap);
  	return r;
  }
  
  int
  evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
  {
  	int r = vsnprintf(buf, buflen, format, ap);
  	buf[buflen-1] = '\0';
  	return r;
  }
  
  static int
  evutil_issetugid(void)
  {
  	return issetugid();
  }
  
  const char *
  evutil_getenv(const char *varname)
  {
  	if (evutil_issetugid())
  		return NULL;
  
  	return getenv(varname);
  }