libguile/simpos.c

   1 /* Copyright (C) 1995,1996,1997,1998,2000,2001, 2003 Free Software
   2  * Foundation, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  */
  18
  19
  20 \f
  21 #if HAVE_CONFIG_H
  22 #  include <config.h>
  23 #endif
  24
  25 #include <errno.h>
  26 #include <stdlib.h>  /* for getenv */
  27
  28 #include "libguile/_scm.h"
  29
  30 #include "libguile/scmsigs.h"
  31 #include "libguile/strings.h"
  32
  33 #include "libguile/validate.h"
  34 #include "libguile/simpos.h"
  35
  36 #ifdef HAVE_STRING_H
  37 #include <string.h>
  38 #endif
  39 #ifdef HAVE_UNISTD_H
  40 #include <unistd.h>
  41 #endif
  42
  43 \f
  44 extern int system();
  45 \f
  46
  47 #ifdef HAVE_SYSTEM
  48 SCM_DEFINE (scm_system, "system", 0, 1, 0,
  49            (SCM cmd),
  50             "Execute @var{cmd} using the operating system's \"command\n"
  51             "processor\".  Under Unix this is usually the default shell\n"
  52             "@code{sh}.  The value returned is @var{cmd}'s exit status as\n"
  53             "returned by @code{waitpid}, which can be interpreted using\n"
  54             "@code{status:exit-val} and friends.\n"
  55             "\n"
  56             "If @code{system} is called without arguments, return a boolean\n"
  57             "indicating whether the command processor is available.")
  58 #define FUNC_NAME s_scm_system
  59 {
  60   int rv;
  61
  62   if (SCM_UNBNDP (cmd))
  63     {
  64       rv = system (NULL);
  65       return SCM_BOOL(rv);
  66     }
  67   SCM_VALIDATE_STRING (1, cmd);
  68   SCM_DEFER_INTS;
  69   errno = 0;
  70   rv = system (SCM_STRING_CHARS (cmd));
  71   if (rv == -1 || (rv == 127 && errno != 0))
  72     SCM_SYSERROR;
  73   SCM_ALLOW_INTS;
  74   return SCM_MAKINUM (rv);
  75 }
  76 #undef FUNC_NAME
  77 #endif /* HAVE_SYSTEM */
  78
  79 SCM_DEFINE (scm_getenv, "getenv", 1, 0, 0,
  80             (SCM nam),
  81             "Looks up the string @var{name} in the current environment.  The return\n"
  82             "value is @code{#f} unless a string of the form @code{NAME=VALUE} is\n"
  83             "found, in which case the string @code{VALUE} is returned.")
  84 #define FUNC_NAME s_scm_getenv
  85 {
  86   char *val;
  87   SCM_VALIDATE_STRING (1, nam);
  88   val = getenv (SCM_STRING_CHARS (nam));
  89   return val ? scm_mem2string (val, strlen (val)) : SCM_BOOL_F;
  90 }
  91 #undef FUNC_NAME
  92
  93 /* simple exit, without unwinding the scheme stack or flushing ports.  */
  94 SCM_DEFINE (scm_primitive_exit, "primitive-exit", 0, 1, 0,
  95             (SCM status),
  96             "Terminate the current process without unwinding the Scheme stack.\n"
  97             "This is would typically be useful after a fork.  The exit status\n"
  98             "is @var{status} if supplied, otherwise zero.")
  99 #define FUNC_NAME s_scm_primitive_exit
 100 {
 101   int cstatus = 0;
 102   if (!SCM_UNBNDP (status))
 103     {
 104       SCM_VALIDATE_INUM (1, status);
 105       cstatus = SCM_INUM (status);
 106     }
 107   exit (cstatus);
 108 }
 109 #undef FUNC_NAME
 110
 111
 112 void
 113 scm_init_simpos ()
 114 {
 115 #include "libguile/simpos.x"
 116 }
 117
 118
 119 /*
 120   Local Variables:
 121   c-file-style: "gnu"
 122   End:
 123 */