#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#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
#include <unistd.h>
#if HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#include "posix.h"
extern int system();
#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
#ifdef HAVE_SYSTEM
#ifdef HAVE_WAITPID
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;
execargv = scm_i_allocate_string_pointers (args);
sig_ign = scm_from_ulong ((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)
{
execvp (execargv[0], execargv);
fprintf (stderr, "In execvp of %s: %s\n",
execargv[0], strerror (errno));
_exit (127);
}
else
{
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));
return scm_from_int (status);
}
}
else
SCM_WRONG_TYPE_ARG (1, args);
}
#undef FUNC_NAME
#endif
#endif
SCM_DEFINE (scm_getenv, "getenv", 1, 0, 0,
(SCM nam),
"Looks up the string @var{nam} 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
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"
}