libguile/simpos.c

   1 /* Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  */
  17
  18
  19 \f
  20 #if HAVE_CONFIG_H
  21 #  include <config.h>
  22 #endif
  23
  24 #include <errno.h>
  25 #include <stdlib.h>  /* for getenv */
  26
  27 #include "libguile/_scm.h"
  28
  29 #include "libguile/scmsigs.h"
  30 #include "libguile/strings.h"
  31
  32 #include "libguile/validate.h"
  33 #include "libguile/simpos.h"
  34
  35 #ifdef HAVE_STRING_H
  36 #include <string.h>
  37 #endif
  38 #ifdef HAVE_UNISTD_H
  39 #include <unistd.h>
  40 #endif
  41
  42 \f
  43 extern int system();
  44 \f
  45
  46 #ifdef HAVE_SYSTEM
  47 SCM_DEFINE (scm_system, "system", 0, 1, 0,
  48            (SCM cmd),
  49             "Execute @var{cmd} using the operating system's \"command\n"
  50             "processor\".  Under Unix this is usually the default shell\n"
  51             "@code{sh}.  The value returned is @var{cmd}'s exit status as\n"
  52             "returned by @code{waitpid}, which can be interpreted using the\n"
  53             "functions above.\n"
  54             "\n"
  55             "If @code{system} is called without arguments, return a boolean\n"
  56             "indicating whether the command processor is available.")
  57 #define FUNC_NAME s_scm_system
  58 {
  59   int rv;
  60
  61   if (SCM_UNBNDP (cmd))
  62     {
  63       rv = system (NULL);
  64       return SCM_BOOL(rv);
  65     }
  66   SCM_VALIDATE_STRING (1, cmd);
  67   SCM_DEFER_INTS;
  68   errno = 0;
  69   rv = system (SCM_STRING_CHARS (cmd));
  70   if (rv == -1 || (rv == 127 && errno != 0))
  71     SCM_SYSERROR;
  72   SCM_ALLOW_INTS;
  73   return SCM_MAKINUM (rv);
  74 }
  75 #undef FUNC_NAME
  76 #endif /* HAVE_SYSTEM */
  77
  78 SCM_DEFINE (scm_getenv, "getenv", 1, 0, 0,
  79             (SCM nam),
  80             "Looks up the string @var{name} in the current environment.  The return\n"
  81             "value is @code{#f} unless a string of the form @code{NAME=VALUE} is\n"
  82             "found, in which case the string @code{VALUE} is returned.")
  83 #define FUNC_NAME s_scm_getenv
  84 {
  85   char *val;
  86   SCM_VALIDATE_STRING (1, nam);
  87   val = getenv (SCM_STRING_CHARS (nam));
  88   return val ? scm_mem2string (val, strlen (val)) : SCM_BOOL_F;
  89 }
  90 #undef FUNC_NAME
  91
  92 /* simple exit, without unwinding the scheme stack or flushing ports.  */
  93 SCM_DEFINE (scm_primitive_exit, "primitive-exit", 0, 1, 0,
  94             (SCM status),
  95             "Terminate the current process without unwinding the Scheme stack.\n"
  96             "This is would typically be useful after a fork.  The exit status\n"
  97             "is @var{status} if supplied, otherwise zero.")
  98 #define FUNC_NAME s_scm_primitive_exit
  99 {
 100   int cstatus = 0;
 101   if (!SCM_UNBNDP (status))
 102     {
 103       SCM_VALIDATE_INUM (1, status);
 104       cstatus = SCM_INUM (status);
 105     }
 106   exit (cstatus);
 107 }
 108 #undef FUNC_NAME
 109
 110
 111 void
 112 scm_init_simpos ()
 113 {
 114 #include "libguile/simpos.x"
 115 }
 116
 117
 118 /*
 119   Local Variables:
 120   c-file-style: "gnu"
 121   End:
 122 */