src/os.h

   1 /* Copyright (c) 2008, 2009
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  *      Micah Cowan (micah@cowan.name)
   5  *      Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
   6  * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
   7  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   8  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   9  * Copyright (c) 1987 Oliver Laumann
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 3, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program (see the file COPYING); if not, see
  23  * https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
  24  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  25  *
  26  ****************************************************************
  27  * $Id$ GNU
  28  */
  29
  30 #include "config.h"
  31
  32 #include <stdio.h>
  33 #include <errno.h>
  34 #include <sys/param.h>
  35 #include <fcntl.h>
  36
  37 #include <limits.h>
  38
  39 #include <unistd.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <stdarg.h>
  43 #include <time.h>
  44 #include <sys/time.h>
  45
  46 #if defined(HAVE_SETRESUID) && !defined(HAVE_SETREUID)
  47 # define setreuid(ruid, euid) setresuid(ruid, euid, -1)
  48 # define setregid(rgid, egid) setresgid(rgid, egid, -1)
  49 #endif
  50
  51 #ifndef HAVE_UTIMES
  52 # define utimes utime
  53 #endif
  54
  55 #ifdef ENABLE_TELNET
  56 # include <netinet/in.h>
  57 # include <arpa/inet.h>
  58 #endif
  59
  60 /*****************************************************************
  61  *    terminal handling
  62  */
  63
  64 #include <termios.h>
  65 #ifdef NCCS
  66 # define MAXCC NCCS
  67 #else
  68 # define MAXCC 256
  69 #endif
  70
  71 #ifndef VDISABLE
  72 # ifdef _POSIX_VDISABLE
  73 #  define VDISABLE _POSIX_VDISABLE
  74 # else
  75 #  define VDISABLE 0377
  76 # endif /* _POSIX_VDISABLE */
  77 #endif /* !VDISABLE */
  78
  79 /*****************************************************************
  80  *   utmp handling
  81  */
  82
  83 #if defined(ENABLE_UTMP)
  84 # include <utmpx.h>
  85
  86 typedef char* slot_t;   /* used internally in utmp.c */
  87
  88 # ifndef UTMPFILE
  89 #  ifdef UTMPX_FILE
  90 #   define UTMPXFILE    UTMPX_FILE
  91 #  else
  92 #   ifdef _PATH_UTMPX
  93 #    define UTMPXFILE   _PATH_UTMPX
  94 #   else
  95 #    define UTMPXFILE   "/etc/utmpx"
  96 #   endif /* _PATH_UTMPX */
  97 #  endif
  98 # endif
  99
 100 #endif /* ENABLE_UTMP */
 101
 102 /*****************************************************************
 103  *    signal stuff
 104  */
 105
 106 /* apparently NSIG is not part of standard, but it's present some form in most
 107  * libc headers, if not define sane default
 108  */
 109 #if !defined(NSIG)
 110 # if defined(_NSIG)
 111 #  define NSIG _NSIG
 112 # else
 113 #  define NSIG 32
 114 # endif
 115 #endif
 116
 117 /*****************************************************************
 118  *    file stuff
 119  */
 120
 121 /*
 122  * SunOS 4.1.3: `man 2V open' has only one line that mentions O_NOBLOCK:
 123  *
 124  *     O_NONBLOCK     Same as O_NDELAY above.
 125  *
 126  * on the very same SunOS 4.1.3, I traced the open system call and found
 127  * that an open("/dev/ttyy08", O_RDWR|O_NONBLOCK|O_NOCTTY) was blocked,
 128  * whereas open("/dev/ttyy08", O_RDWR|O_NDELAY  |O_NOCTTY) went through.
 129  *
 130  * For this simple reason I now favour O_NDELAY. jw. 4.5.95
 131  */
 132 #if !defined(O_NONBLOCK) && defined(O_NDELAY)
 133 # define O_NONBLOCK O_NDELAY
 134 #endif
 135
 136 #if !defined(FNBLOCK) && defined(FNONBLOCK)
 137 # define FNBLOCK FNONBLOCK
 138 #endif
 139 #if !defined(FNBLOCK) && defined(FNDELAY)
 140 # define FNBLOCK FNDELAY
 141 #endif
 142 #if !defined(FNBLOCK) && defined(O_NONBLOCK)
 143 # define FNBLOCK O_NONBLOCK
 144 #endif
 145
 146 /*****************************************************************
 147  *    user defineable stuff
 148  */
 149
 150 #ifndef TERMCAP_BUFSIZE
 151 # define TERMCAP_BUFSIZE 1023
 152 #endif
 153
 154 /*
 155  * you may try to vary this value. Use low values if your (VMS) system
 156  * tends to choke when pasting. Use high values if you want to test
 157  * how many characters your pty's can buffer.
 158  */
 159 #define IOSIZE          4096
 160
 161 /* Changing those you won't be able to attach to your old sessions
 162  * when changing those values in official tree don't forget to bump
 163  * MSG_VERSION */
 164 #define MAXTERMLEN      32
 165 #define MAXLOGINLEN     256
 166