--- /dev/null
+/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2003, 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <errno.h>
+#include <signal.h> /* for SIG constants */
+#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"
+#include "libguile/dynwind.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, eno;
+ char *c_cmd;
+
+ if (SCM_UNBNDP (cmd))
+ {
+ rv = system (NULL);
+ return scm_from_bool(rv);
+ }
+ SCM_VALIDATE_STRING (1, cmd);
+ errno = 0;
+ c_cmd = scm_to_locale_string (cmd);
+ rv = system (c_cmd);
+ eno = errno; free (c_cmd); errno = eno;
+ if (rv == -1 || (rv == 127 && errno != 0))
+ SCM_SYSERROR;
+ return scm_from_int (rv);
+}
+#undef FUNC_NAME
+#endif /* HAVE_SYSTEM */
+
+
+#ifdef HAVE_SYSTEM
+#ifdef HAVE_WAITPID
+
+static void
+free_string_pointers (void *data)
+{
+ scm_i_free_string_pointers ((char **)data);
+}
+
+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_is_null (args))
+ SCM_WRONG_NUM_ARGS ();
+
+ if (scm_is_pair (args))
+ {
+ SCM oldint;
+ SCM oldquit;
+ SCM sig_ign;
+ SCM sigint;
+ SCM sigquit;
+ int pid;
+ char **execargv;
+
+ scm_dynwind_begin (0);
+
+ /* allocate before fork */
+ execargv = scm_i_allocate_string_pointers (args);
+ scm_dynwind_unwind_handler (free_string_pointers, execargv,
+ SCM_F_WIND_EXPLICITLY);
+
+ /* make sure the child can't kill us (as per normal system call) */
+ sig_ign = scm_from_long ((unsigned long) SIG_IGN);
+ sigint = scm_from_int (SIGINT);
+ sigquit = scm_from_int (SIGQUIT);
+ oldint = scm_sigaction (sigint, sig_ign, SCM_UNDEFINED);
+ oldquit = scm_sigaction (sigquit, sig_ign, SCM_UNDEFINED);
+
+ pid = fork ();
+ if (pid == 0)
+ {
+ /* child */
+ execvp (execargv[0], execargv);
+ SCM_SYSERROR;
+ /* not reached. */
+ scm_dynwind_end ();
+ return SCM_BOOL_F;
+ }
+ else
+ {
+ /* parent */
+ int wait_result, status;
+
+ if (pid == -1)
+ SCM_SYSERROR;
+
+ 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_dynwind_end ();
+ return scm_from_int (status);
+ }
+ }
+ else
+ SCM_WRONG_TYPE_ARG (1, 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;
+ char *var = scm_to_locale_string (nam);
+ val = getenv (var);
+ free (var);
+ return val ? scm_from_locale_string (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\n"
+ "stack. The exit status is @var{status} if supplied, otherwise\n"
+ "zero.")
+#define FUNC_NAME s_scm_primitive_exit
+{
+ int cstatus = 0;
+ if (!SCM_UNBNDP (status))
+ cstatus = scm_to_int (status);
+ exit (cstatus);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_primitive__exit, "primitive-_exit", 0, 1, 0,
+ (SCM status),
+ "Terminate the current process using the _exit() system call and\n"
+ "without unwinding the Scheme stack. The exit status is\n"
+ "@var{status} if supplied, otherwise zero.\n"
+ "\n"
+ "This function is typically useful after a fork, to ensure no\n"
+ "Scheme cleanups or @code{atexit} handlers are run (those\n"
+ "usually belonging in the parent rather than the child).")
+#define FUNC_NAME s_scm_primitive__exit
+{
+ int cstatus = 0;
+ if (!SCM_UNBNDP (status))
+ cstatus = scm_to_int (status);
+ _exit (cstatus);
+}
+#undef FUNC_NAME
+
+
+
+void
+scm_init_simpos ()
+{
+#include "libguile/simpos.x"
+}
+
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
projects / lilypond.git / blobdiff