-/* Copyright (C) 1995,1996,1997 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 software; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307 USA
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice. */
-\f
-
-#include <stdio.h>
-#include "_scm.h"
-
-#include "scmsigs.h"
-#include "simpos.h"
-
-#ifdef HAVE_STRING_H
-#include <string.h>
-#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-\f
-extern int system();
-\f
-
-#ifndef _Windows
-SCM_PROC(s_system, "system", 1, 0, 0, scm_system);
-
-SCM
-scm_system(cmd)
- SCM cmd;
-{
- SCM_ASSERT(SCM_NIMP(cmd) && SCM_ROSTRINGP(cmd), cmd, SCM_ARG1, s_system);
- if (SCM_ROSTRINGP (cmd))
- cmd = scm_makfromstr (SCM_ROCHARS (cmd), SCM_ROLENGTH (cmd), 0);
-# ifdef AZTEC_C
- cmd = SCM_MAKINUM(Execute(SCM_ROCHARS(cmd), 0, 0));
-# else
- cmd = SCM_MAKINUM(0L+system(SCM_ROCHARS(cmd)));
-# endif
- return cmd;
-}
-#endif
-
-extern char *getenv();
-SCM_PROC (s_getenv, "getenv", 1, 0, 0, scm_getenv);
-
-SCM
-scm_getenv(nam)
- SCM nam;
-{
- char *val;
- SCM_ASSERT(SCM_NIMP(nam) && SCM_ROSTRINGP(nam), nam, SCM_ARG1, s_getenv);
- if (SCM_ROSTRINGP (nam))
- nam = scm_makfromstr (SCM_ROCHARS (nam), SCM_ROLENGTH (nam), 0);
- val = getenv(SCM_CHARS(nam));
- return (val) ? scm_makfromstr(val, (scm_sizet)strlen(val), 0) : SCM_BOOL_F;
-}
-
-SCM_PROC (s_primitive_exit, "primitive-exit", 0, 1, 0, scm_primitive_exit);
-SCM
-scm_primitive_exit (SCM status)
-{
- int cstatus = 0;
- if (!SCM_UNBNDP (status))
- {
- SCM_ASSERT (SCM_INUMP (status), status, SCM_ARG1, s_primitive_exit);
- cstatus = SCM_INUM (status);
- }
- exit (cstatus);
-}
-
-/* I have a feeling this whole arrangement below is a bad idea. One
- should always test for the presence or absence of a particular
- feature, instead of checking the system name. Older versions of a
- system may lack features posessed by new ones, and a feature
- appearing on one system will soon appear on others. And autoconf
- provides the mechanisms for detecting features. -JimB */
-
-#ifdef _AIX
-# define SYSTNAME "AIX"
-#endif
-#ifdef vms
-# define SYSTNAME "VMS"
-#endif
-#if defined (unix) || defined (__unix) || defined(__CYGWIN32__)
-# define SYSTNAME "UNIX"
-#endif
-#ifdef MWC
-# define SYSTNAME "COHERENT"
-#endif
-#ifdef _Windows
-# define SYSTNAME "WINDOWS"
-#else
-# ifdef MSDOS
-# define SYSTNAME "MS-DOS"
-# endif
-#endif
-#ifdef __EMX__
-# define SYSTNAME "OS/2"
-#endif
-#ifdef __IBMC__
-# define SYSTNAME "OS/2"
-#endif
-#ifdef THINK_C
-# define SYSTNAME "THINKC"
-#endif
-#ifdef AMIGA
-# define SYSTNAME "AMIGA"
-#endif
-#ifdef atarist
-# define SYSTNAME "ATARIST"
-#endif
-#ifdef mach
-# define SYSTNAME "MACH"
-#endif
-#ifdef ARM_ULIB
-# define SYSTNAME "ACORN"
-#endif
-
-SCM_PROC(s_software_type, "software-type", 0, 0, 0, scm_software_type);
-
-SCM
-scm_software_type()
-{
-#ifdef nosve
- return SCM_CAR(scm_intern("nosve", 5));
-#else
- return SCM_CAR(scm_intern(SYSTNAME, sizeof SYSTNAME/sizeof(char) -1));
-#endif
-}
-
-
-void
-scm_init_simpos ()
-{
-#include "simpos.x"
-}
-
+/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2003 Free Software
+ * Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+\f
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <errno.h>
+#include <stdlib.h> /* for getenv */
+
+#include "libguile/_scm.h"
+
+#include "libguile/scmsigs.h"
+#include "libguile/strings.h"
+
+#include "libguile/validate.h"
+#include "libguile/simpos.h"
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if HAVE_SYS_WAIT_H
+# include <sys/wait.h>
+#endif
+
+#include "posix.h"
+
+\f
+extern int system();
+\f
+
+#ifdef HAVE_SYSTEM
+SCM_DEFINE (scm_system, "system", 0, 1, 0,
+ (SCM cmd),
+ "Execute @var{cmd} using the operating system's \"command\n"
+ "processor\". Under Unix this is usually the default shell\n"
+ "@code{sh}. The value returned is @var{cmd}'s exit status as\n"
+ "returned by @code{waitpid}, which can be interpreted using\n"
+ "@code{status:exit-val} and friends.\n"
+ "\n"
+ "If @code{system} is called without arguments, return a boolean\n"
+ "indicating whether the command processor is available.")
+#define FUNC_NAME s_scm_system
+{
+ int rv;
+
+ if (SCM_UNBNDP (cmd))
+ {
+ rv = system (NULL);
+ return SCM_BOOL(rv);
+ }
+ SCM_VALIDATE_STRING (1, cmd);
+ errno = 0;
+ rv = system (SCM_STRING_CHARS (cmd));
+ if (rv == -1 || (rv == 127 && errno != 0))
+ SCM_SYSERROR;
+ return SCM_MAKINUM (rv);
+}
+#undef FUNC_NAME
+#endif /* HAVE_SYSTEM */
+
+
+#ifdef HAVE_SYSTEM
+#ifdef HAVE_WAITPID
+
+/* return a newly allocated array of char pointers to each of the strings
+ in args, with a terminating NULL pointer. */
+/* Note: a similar function is defined in dynl.c, but we don't necessarily
+ want to export it. */
+static char **
+allocate_string_pointers (SCM args)
+{
+ char **result;
+ int n_args = scm_ilength (args);
+ int i;
+
+ SCM_ASSERT (n_args >= 0, args, SCM_ARGn, "allocate_string_pointers");
+ result = (char **) scm_malloc ((n_args + 1) * sizeof (char *));
+ result[n_args] = NULL;
+ for (i = 0; i < n_args; i++)
+ {
+ SCM car = SCM_CAR (args);
+
+ if (!SCM_STRINGP (car))
+ {
+ free (result);
+ scm_wrong_type_arg ("allocate_string_pointers", SCM_ARGn, car);
+ }
+ result[i] = SCM_STRING_CHARS (SCM_CAR (args));
+ args = SCM_CDR (args);
+ }
+ return result;
+}
+
+SCM_DEFINE (scm_system_star, "system*", 0, 0, 1,
+ (SCM args),
+"Execute the command indicated by @var{args}. The first element must\n"
+"be a string indicating the command to be executed, and the remaining\n"
+"items must be strings representing each of the arguments to that\n"
+"command.\n"
+"\n"
+"This function returns the exit status of the command as provided by\n"
+"@code{waitpid}. This value can be handled with @code{status:exit-val}\n"
+"and the related functions.\n"
+"\n"
+"@code{system*} is similar to @code{system}, but accepts only one\n"
+"string per-argument, and performs no shell interpretation. The\n"
+"command is executed using fork and execlp. Accordingly this function\n"
+"may be safer than @code{system} in situations where shell\n"
+"interpretation is not required.\n"
+"\n"
+"Example: (system* \"echo\" \"foo\" \"bar\")")
+#define FUNC_NAME s_scm_system_star
+{
+ if (SCM_NULLP (args))
+ SCM_WRONG_NUM_ARGS ();
+
+ if (SCM_CONSP (args))
+ {
+ SCM oldint;
+ SCM oldquit;
+ SCM sig_ign;
+ SCM sigint;
+ SCM sigquit;
+ int pid;
+ char **execargv;
+
+ SCM_VALIDATE_STRING (1, SCM_CAR (args));
+ /* allocate before fork */
+ execargv = allocate_string_pointers (args);
+
+ /* make sure the child can't kill us (as per normal system call) */
+ sig_ign = scm_long2num ((long) SIG_IGN);
+ sigint = scm_long2num (SIGINT);
+ sigquit = scm_long2num (SIGQUIT);
+ oldint = scm_sigaction (sigint, sig_ign, SCM_UNDEFINED);
+ oldquit = scm_sigaction (sigquit, sig_ign, SCM_UNDEFINED);
+
+ pid = fork ();
+ if (pid == -1)
+ SCM_SYSERROR;
+ else if (pid)
+ {
+ int wait_result;
+ int status;
+ SCM_SYSCALL (wait_result = waitpid (pid, &status, 0));
+ if (wait_result == -1) SCM_SYSERROR;
+ scm_sigaction (sigint, SCM_CAR (oldint), SCM_CDR (oldint));
+ scm_sigaction (sigquit, SCM_CAR (oldquit), SCM_CDR (oldquit));
+ scm_remember_upto_here_2 (oldint, oldquit);
+ return SCM_MAKINUM (0L + status);
+ }
+ else
+ {
+ execvp (SCM_STRING_CHARS (SCM_CAR (args)), execargv);
+ scm_remember_upto_here_1 (args);
+ SCM_SYSERROR;
+ /* not reached. */
+ return SCM_BOOL_F;
+ }
+ }
+ else
+ SCM_WRONG_TYPE_ARG (1, SCM_CAR (args));
+}
+#undef FUNC_NAME
+#endif /* HAVE_WAITPID */
+#endif /* HAVE_SYSTEM */
+
+
+SCM_DEFINE (scm_getenv, "getenv", 1, 0, 0,
+ (SCM nam),
+ "Looks up the string @var{name} in the current environment. The return\n"
+ "value is @code{#f} unless a string of the form @code{NAME=VALUE} is\n"
+ "found, in which case the string @code{VALUE} is returned.")
+#define FUNC_NAME s_scm_getenv
+{
+ char *val;
+ SCM_VALIDATE_STRING (1, nam);
+ val = getenv (SCM_STRING_CHARS (nam));
+ return val ? scm_mem2string (val, strlen (val)) : SCM_BOOL_F;
+}
+#undef FUNC_NAME
+
+/* simple exit, without unwinding the scheme stack or flushing ports. */
+SCM_DEFINE (scm_primitive_exit, "primitive-exit", 0, 1, 0,
+ (SCM status),
+ "Terminate the current process without unwinding the Scheme stack.\n"
+ "This is would typically be useful after a fork. The exit status\n"
+ "is @var{status} if supplied, otherwise zero.")
+#define FUNC_NAME s_scm_primitive_exit
+{
+ int cstatus = 0;
+ if (!SCM_UNBNDP (status))
+ {
+ SCM_VALIDATE_INUM (1, status);
+ cstatus = SCM_INUM (status);
+ }
+ exit (cstatus);
+}
+#undef FUNC_NAME
+
+
+void
+scm_init_simpos ()
+{
+#include "libguile/simpos.x"
+}
+
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff