mirror of
https://git.savannah.gnu.org/git/guile.git
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231 lines
6.3 KiB
C
231 lines
6.3 KiB
C
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2003, 2004, 2009, 2010 Free Software
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* Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <errno.h>
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#include <signal.h> /* for SIG constants */
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#include <stdlib.h> /* for getenv */
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#include "libguile/_scm.h"
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#include "libguile/scmsigs.h"
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#include "libguile/strings.h"
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#include "libguile/validate.h"
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#include "libguile/simpos.h"
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#include "libguile/dynwind.h"
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_SYS_WAIT_H
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# include <sys/wait.h>
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#endif
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#include "posix.h"
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extern int system();
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#ifdef HAVE_SYSTEM
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SCM_DEFINE (scm_system, "system", 0, 1, 0,
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(SCM cmd),
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"Execute @var{cmd} using the operating system's \"command\n"
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"processor\". Under Unix this is usually the default shell\n"
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"@code{sh}. The value returned is @var{cmd}'s exit status as\n"
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"returned by @code{waitpid}, which can be interpreted using\n"
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"@code{status:exit-val} and friends.\n"
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"\n"
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"If @code{system} is called without arguments, return a boolean\n"
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"indicating whether the command processor is available.")
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#define FUNC_NAME s_scm_system
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{
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int rv, eno;
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char *c_cmd;
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if (SCM_UNBNDP (cmd))
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{
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rv = system (NULL);
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return scm_from_bool(rv);
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}
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SCM_VALIDATE_STRING (1, cmd);
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errno = 0;
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c_cmd = scm_to_locale_string (cmd);
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rv = system (c_cmd);
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eno = errno; free (c_cmd); errno = eno;
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if (rv == -1 || (rv == 127 && errno != 0))
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SCM_SYSERROR;
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return scm_from_int (rv);
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}
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#undef FUNC_NAME
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#endif /* HAVE_SYSTEM */
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#ifdef HAVE_SYSTEM
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#ifdef HAVE_WAITPID
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SCM_DEFINE (scm_system_star, "system*", 0, 0, 1,
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(SCM args),
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"Execute the command indicated by @var{args}. The first element must\n"
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"be a string indicating the command to be executed, and the remaining\n"
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"items must be strings representing each of the arguments to that\n"
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"command.\n"
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"\n"
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"This function returns the exit status of the command as provided by\n"
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"@code{waitpid}. This value can be handled with @code{status:exit-val}\n"
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"and the related functions.\n"
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"\n"
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"@code{system*} is similar to @code{system}, but accepts only one\n"
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"string per-argument, and performs no shell interpretation. The\n"
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"command is executed using fork and execlp. Accordingly this function\n"
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"may be safer than @code{system} in situations where shell\n"
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"interpretation is not required.\n"
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"\n"
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"Example: (system* \"echo\" \"foo\" \"bar\")")
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#define FUNC_NAME s_scm_system_star
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{
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if (scm_is_null (args))
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SCM_WRONG_NUM_ARGS ();
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if (scm_is_pair (args))
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{
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SCM oldint;
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SCM oldquit;
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SCM sig_ign;
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SCM sigint;
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SCM sigquit;
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int pid;
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char **execargv;
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/* allocate before fork */
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execargv = scm_i_allocate_string_pointers (args);
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/* make sure the child can't kill us (as per normal system call) */
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sig_ign = scm_from_ulong ((unsigned long) SIG_IGN);
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sigint = scm_from_int (SIGINT);
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sigquit = scm_from_int (SIGQUIT);
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oldint = scm_sigaction (sigint, sig_ign, SCM_UNDEFINED);
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oldquit = scm_sigaction (sigquit, sig_ign, SCM_UNDEFINED);
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pid = fork ();
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if (pid == 0)
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{
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/* child */
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execvp (execargv[0], execargv);
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SCM_SYSERROR;
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/* not reached. */
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return SCM_BOOL_F;
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}
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else
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{
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/* parent */
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int wait_result, status;
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if (pid == -1)
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SCM_SYSERROR;
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SCM_SYSCALL (wait_result = waitpid (pid, &status, 0));
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if (wait_result == -1)
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SCM_SYSERROR;
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scm_sigaction (sigint, SCM_CAR (oldint), SCM_CDR (oldint));
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scm_sigaction (sigquit, SCM_CAR (oldquit), SCM_CDR (oldquit));
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return scm_from_int (status);
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}
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}
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else
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SCM_WRONG_TYPE_ARG (1, args);
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}
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#undef FUNC_NAME
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#endif /* HAVE_WAITPID */
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#endif /* HAVE_SYSTEM */
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SCM_DEFINE (scm_getenv, "getenv", 1, 0, 0,
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(SCM nam),
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"Looks up the string @var{name} in the current environment. The return\n"
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"value is @code{#f} unless a string of the form @code{NAME=VALUE} is\n"
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"found, in which case the string @code{VALUE} is returned.")
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#define FUNC_NAME s_scm_getenv
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{
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char *val;
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char *var = scm_to_locale_string (nam);
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val = getenv (var);
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free (var);
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return val ? scm_from_locale_string (val) : SCM_BOOL_F;
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}
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#undef FUNC_NAME
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/* simple exit, without unwinding the scheme stack or flushing ports. */
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SCM_DEFINE (scm_primitive_exit, "primitive-exit", 0, 1, 0,
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(SCM status),
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"Terminate the current process without unwinding the Scheme\n"
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"stack. The exit status is @var{status} if supplied, otherwise\n"
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"zero.")
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#define FUNC_NAME s_scm_primitive_exit
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{
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int cstatus = 0;
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if (!SCM_UNBNDP (status))
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cstatus = scm_to_int (status);
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exit (cstatus);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_primitive__exit, "primitive-_exit", 0, 1, 0,
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(SCM status),
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"Terminate the current process using the _exit() system call and\n"
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"without unwinding the Scheme stack. The exit status is\n"
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"@var{status} if supplied, otherwise zero.\n"
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"\n"
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"This function is typically useful after a fork, to ensure no\n"
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"Scheme cleanups or @code{atexit} handlers are run (those\n"
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"usually belonging in the parent rather than the child).")
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#define FUNC_NAME s_scm_primitive__exit
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{
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int cstatus = 0;
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if (!SCM_UNBNDP (status))
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cstatus = scm_to_int (status);
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_exit (cstatus);
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}
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#undef FUNC_NAME
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void
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scm_init_simpos ()
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{
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#include "libguile/simpos.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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