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callproc.c
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1993-11-22
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/* Synchronous subprocess invocation for GNU Emacs.
Copyright (C) 1985, 1986, 1987, 1988, 1993 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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 1, or (at your option)
any later version.
GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <signal.h>
#include <errno.h>
#include "config.h"
#ifdef STDC_HEADERS
#include <stdlib.h>
#include <stdio.h>
#include <io.h>
#else
extern int errno;
#ifndef VMS
extern char *sys_errlist[];
#endif
#endif
/* Define SIGCHLD as an alias for SIGCLD. */
#if !defined (SIGCHLD) && defined (SIGCLD)
#define SIGCHLD SIGCLD
#endif /* SIGCLD */
#include <sys/types.h>
#ifdef WINDOWSNT
#define NOMINMAX
#include <windows.h>
#include <fcntl.h>
#include "ntsig.h"
/* Defined in process.h which conflicts with the local copy */
#define _P_NOWAIT 1
#else /* !WINDOWSNT */
#include <sys/file.h>
#endif /* !WINDOWSNT */
#ifdef USG5
#include <fcntl.h>
#endif
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
#ifndef O_WRONLY
#define O_WRONLY 1
#endif
#include "lisp.h"
#include "commands.h"
#include "buffer.h"
#include "paths.h"
#include "process.h"
#include "syssignal.h"
#include "callproc_p.h"
#include "xdisp_p.h"
#include "sysdep_p.h"
#include "alloca_p.h"
#include "fileio_p.h"
#include "insdel_p.h"
#ifdef WINDOWSNT
/* In CRT process.h which conflicts with local process.h */
extern int _CRTAPI1 _getpid(void);
#include <direct.h>
#include "ntproc_p.h"
#endif
static Lisp_Object call_process_kill _P_((Lisp_Object fdpid));
static Lisp_Object delete_temp_file _P_((Lisp_Object name));
static int getenv_internal _P_((char *var, int varlen, char **value,
int *valuelen));
#ifdef VMS
extern noshare char **environ;
#else
extern char **environ;
#endif
#ifndef max
#define max(a, b) ((a) > (b) ? (a) : (b))
#endif
Lisp_Object Vexec_path, Vexec_directory, Vdata_directory;
Lisp_Object Vconfigure_info_directory;
Lisp_Object Vshell_file_name;
Lisp_Object Vprocess_environment;
/* True iff we are about to fork off a synchronous process or if we
are waiting for it. */
int synch_process_alive;
/* Nonzero => this is a string explaining death of synchronous subprocess. */
char *synch_process_death;
/* If synch_process_death is zero,
this is exit code of synchronous subprocess. */
int synch_process_retcode;
#ifndef VMS /* VMS version is in vmsproc.c. */
static Lisp_Object
call_process_kill (fdpid)
Lisp_Object fdpid;
{
close (XFASTINT (Fcar (fdpid)));
EMACS_KILLPG (XFASTINT (Fcdr (fdpid)), SIGKILL);
synch_process_alive = 0;
return Qnil;
}
Lisp_Object
call_process_cleanup (fdpid)
Lisp_Object fdpid;
{
register int pid = XFASTINT (Fcdr (fdpid));
if (EMACS_KILLPG (pid, SIGINT) == 0)
{
int count = specpdl_ptr - specpdl;
record_unwind_protect (call_process_kill, fdpid);
message1 ("Waiting for process to die...(type C-g again to kill it instantly)");
immediate_quit = 1;
QUIT;
wait_for_termination (pid);
immediate_quit = 0;
specpdl_ptr = specpdl + count; /* Discard the unwind protect. */
message1 ("Waiting for process to die...done");
}
synch_process_alive = 0;
close (XFASTINT (Fcar (fdpid)));
return Qnil;
}
DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0,
"Call PROGRAM synchronously in separate process.\n\
The program's input comes from file INFILE (nil means `/dev/null').\n\
Insert output in BUFFER before point; t means current buffer;\n\
nil for BUFFER means discard it; 0 means discard and don't wait.\n\
Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
Remaining arguments are strings passed as command arguments to PROGRAM.\n\
If BUFFER is 0, returns immediately with value nil.\n\
Otherwise waits for PROGRAM to terminate\n\
and returns a numeric exit status or a signal description string.\n\
If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.")
(nargs, args)
int nargs;
register Lisp_Object *args;
{
Lisp_Object infile, buffer, current_dir, display, path;
int fd[2];
int filefd;
#ifdef WINDOWSNT
int pid;
#else
register int pid;
#endif /* !WINDOWSNT */
char buf[1024];
int count = specpdl_ptr - specpdl;
register unsigned char **new_argv
= (unsigned char **) alloca ((max (2, nargs - 2)) * sizeof (char *));
struct buffer *old = current_buffer;
#if 0
int mask;
#endif
CHECK_STRING (args[0], 0);
if (nargs >= 2 && ! NILP (args[1]))
{
infile = Fexpand_file_name (args[1], current_buffer->directory);
CHECK_STRING (infile, 1);
}
else
infile = build_string (NULL_DEVICE);
if (nargs >= 3)
{
register Lisp_Object tem;
buffer = tem = args[2];
if (!(EQ (tem, Qnil)
|| EQ (tem, Qt)
|| XFASTINT (tem) == 0))
{
buffer = Fget_buffer (tem);
CHECK_BUFFER (buffer, 2);
}
}
else
buffer = Qnil;
/* Make sure that the child will be able to chdir to the current
buffer's current directory, or its unhandled equivalent. We
can't just have the child check for an error when it does the
chdir, since it's in a vfork.
We have to GCPRO around this because Fexpand_file_name,
Funhandled_file_name_directory, and Ffile_accessible_directory_p
might call a file name handling function. The argument list is
protected by the caller, so all we really have to worry about is
buffer. */
{
struct gcpro gcpro1, gcpro2, gcpro3;
current_dir = current_buffer->directory;
GCPRO3 (infile, buffer, current_dir);
current_dir =
expand_and_dir_to_file
(Funhandled_file_name_directory (current_dir), Qnil);
if (NILP (Ffile_accessible_directory_p (current_dir)))
report_file_error ("Setting current directory",
Fcons (current_buffer->directory, Qnil));
UNGCPRO;
}
display = nargs >= 4 ? args[3] : Qnil;
{
register int i;
for (i = 4; i < nargs; i++)
{
CHECK_STRING (args[i], i);
new_argv[i - 3] = XSTRING (args[i])->data;
}
/* Program name is first command arg */
new_argv[0] = XSTRING (args[0])->data;
new_argv[i - 3] = 0;
}
filefd = open (XSTRING (infile)->data, O_RDONLY, 0);
if (filefd < 0)
{
report_file_error ("Opening process input file", Fcons (infile, Qnil));
}
/* Search for program; barf if not found. */
openp (Vexec_path, args[0], EXEC_SUFFIXES, &path, 1);
if (NILP (path))
{
close (filefd);
report_file_error ("Searching for program", Fcons (args[0], Qnil));
}
new_argv[0] = XSTRING (path)->data;
if (XTYPE (buffer) == Lisp_Int)
fd[1] = open (NULL_DEVICE, O_WRONLY), fd[0] = -1;
else {
#ifdef WINDOWSNT
/*
* Since NT's crt dup always creates inherited handles, we
* must be careful in setting up the pipe. First create
* non-inherited pipe handles, then create an inherited handle
* to the write end by dup-ing it, and then close the non-inherited
* end that was just duped. This gives us one non-inherited handle
* on the read end and one inherited handle to the write end. As
* the parent, we close the inherited handle to the write end after
* spawning the child.
* (voelker)
*/
int childOut;
_pipe(fd, 0, _O_NOINHERIT);
childOut = dup(fd[1]);
if (close(fd[1]) < 0) {
report_file_error("Closing parent's write end of pipe", Qnil);
}
fd[1] = childOut;
#else /* !WINDOWSNT */
pipe (fd);
#endif /* !WINDOWSNT */
#if 0
/* Replaced by close_process_descs */
set_exclusive_use (fd[0]);
#endif
}
{
/* child_setup must clobber environ in systems with true vfork.
Protect it from permanent change. */
register char **save_environ = environ;
register int fd1 = fd[1];
#if 0 /* Some systems don't have sigblock. */
mask = sigblock (sigmask (SIGCHLD));
#endif
/* Record that we're about to create a synchronous process. */
synch_process_alive = 1;
#ifdef WINDOWSNT
child_setup (filefd, fd1, fd1, new_argv, 0, current_dir, &pid);
#else /* !WINDOWSNT */
pid = vfork ();
if (pid == 0)
{
if (fd[0] >= 0)
close (fd[0]);
#ifdef USG
setpgrp ();
#else
setpgrp (pid, pid);
#endif /* USG */
child_setup (filefd, fd1, fd1, new_argv, 0, current_dir);
}
#endif /* !WINDOWSNT */
#if 0
/* Tell SIGCHLD handler to look for this pid. */
synch_process_pid = pid;
/* Now let SIGCHLD come through. */
sigsetmask (mask);
#endif
environ = save_environ;
close (filefd);
close (fd1);
}
if (pid < 0)
{
close (fd[0]);
report_file_error ("Doing vfork", Qnil);
}
if (XTYPE (buffer) == Lisp_Int)
{
#ifndef subprocesses
/* If Emacs has been built with asynchronous subprocess support,
we don't need to do this, I think because it will then have
the facilities for handling SIGCHLD. */
wait_without_blocking ();
#endif /* subprocesses */
return Qnil;
}
synch_process_death = 0;
synch_process_retcode = 0;
record_unwind_protect (call_process_cleanup,
Fcons (make_number (fd[0]), make_number (pid)));
if (XTYPE (buffer) == Lisp_Buffer)
Fset_buffer (buffer);
immediate_quit = 1;
QUIT;
{
register int nread;
while ((nread = read (fd[0], buf, sizeof buf)) > 0)
{
immediate_quit = 0;
if (!NILP (buffer))
insert (buf, nread);
if (!NILP (display) && INTERACTIVE)
redisplay_preserve_echo_area ();
immediate_quit = 1;
QUIT;
}
}
/* Wait for it to terminate, unless it already has. */
wait_for_termination (pid);
immediate_quit = 0;
set_buffer_internal (old);
unbind_to (count, Qnil);
if (synch_process_death)
return build_string (synch_process_death);
return make_number (synch_process_retcode);
}
#endif
static Lisp_Object
delete_temp_file (name)
Lisp_Object name;
{
if (unlink (XSTRING (name)->data) == 0)
return Qt;
else
return Qnil;
}
DEFUN ("call-process-region", Fcall_process_region, Scall_process_region,
3, MANY, 0,
"Send text from START to END to a synchronous process running PROGRAM.\n\
Delete the text if fourth arg DELETE is non-nil.\n\
Insert output in BUFFER before point; t means current buffer;\n\
nil for BUFFER means discard it; 0 means discard and don't wait.\n\
Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
Remaining args are passed to PROGRAM at startup as command args.\n\
If BUFFER is nil, returns immediately with value nil.\n\
Otherwise waits for PROGRAM to terminate\n\
and returns a numeric exit status or a signal description string.\n\
If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.")
(nargs, args)
int nargs;
register Lisp_Object *args;
{
register Lisp_Object filename_string, start, end;
char tempfile[20];
int count = specpdl_ptr - specpdl;
#ifdef VMS
strcpy (tempfile, "tmp:emacsXXXXXX.");
#else
sprintf (tempfile, "%ctmp%cemacsXXXXXX", PATH_SEPARATOR, PATH_SEPARATOR);
#endif
mktemp (tempfile);
filename_string = build_string (tempfile);
start = args[0];
end = args[1];
Fwrite_region (start, end, filename_string, Qnil, Qlambda);
record_unwind_protect (delete_temp_file, filename_string);
if (!NILP (args[3]))
Fdelete_region (start, end);
args[3] = filename_string;
return unbind_to (count, Fcall_process (nargs - 2, args + 2));
}
#ifndef VMS /* VMS version is in vmsproc.c. */
/* This is the last thing run in a newly forked inferior
either synchronous or asynchronous.
Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
Initialize inferior's priority, pgrp, connected dir and environment.
then exec another program based on new_argv.
This function may change environ for the superior process.
Therefore, the superior process must save and restore the value
of environ around the vfork and the call to this function.
ENV is the environment for the subprocess.
SET_PGRP is nonzero if we should put the subprocess into a separate
process group.
CURRENT_DIR is an elisp string giving the path of the current
directory the subprocess should have. Since we can't really signal
a decent error from within the child, this should be verified as an
executable directory by the parent. */
_VOID_
child_setup (in, out, err, new_argv, set_pgrp, current_dir
#ifdef WINDOWSNT
, cpid // yeech!
#endif /* WINDOWSNT */
)
int in, out, err;
register char **new_argv;
int set_pgrp;
Lisp_Object current_dir;
#ifdef WINDOWSNT
int *cpid; // yeech!
#endif /* WINDOWSNT */
{
char **env;
register int pid = getpid();
#ifdef WINDOWSNT
HANDLE parent, errHandle, stdinSave, stdoutSave, stderrSave;
#endif /* WINDOWSNT */
#ifndef WINDOWSNT
{
extern int emacs_priority;
nice (- emacs_priority);
}
#endif /* !WINDOWSNT */
#ifdef subprocesses
#ifndef WINDOWSNT
/* Close Emacs's descriptors that this process should not have. */
close_process_descs ();
#endif /* !WINDOWSNT */
#endif
/* Note that use of alloca is always safe here. It's obvious for systems
that do not have true vfork or that have true (stack) alloca.
If using vfork and C_ALLOCA it is safe because that changes
the superior's static variables as if the superior had done alloca
and will be cleaned up in the usual way. */
{
register unsigned char *temp;
register int i;
i = XSTRING (current_dir)->size;
temp = (unsigned char *) alloca (i + 2);
bcopy (XSTRING (current_dir)->data, temp, i);
if (temp[i - 1] != PATH_SEPARATOR) temp[i++] = PATH_SEPARATOR;
temp[i] = 0;
/* We can't signal an Elisp error here; we're in a vfork. Since
the callers check the current directory before forking, this
should only return an error if the directory's permissions
are changed between the check and this chdir, but we should
at least check. */
if (chdir (temp) < 0)
exit (errno);
}
/* Set `env' to a vector of the strings in Vprocess_environment. */
{
register Lisp_Object tem;
register char **new_env;
register int new_length;
new_length = 0;
for (tem = Vprocess_environment;
(XTYPE (tem) == Lisp_Cons
&& XTYPE (XCONS (tem)->car) == Lisp_String);
tem = XCONS (tem)->cdr)
new_length++;
/* new_length + 1 to include terminating 0. */
env = new_env = (char **) alloca ((new_length + 1) * sizeof (char *));
/* Copy the Vprocess_environment strings into new_env. */
for (tem = Vprocess_environment;
(XTYPE (tem) == Lisp_Cons
&& XTYPE (XCONS (tem)->car) == Lisp_String);
tem = XCONS (tem)->cdr)
{
char **ep = env;
char *string = (char *) XSTRING (XCONS (tem)->car)->data;
/* See if this string duplicates any string already in the env.
If so, don't put it in.
When an env var has multiple definitions,
we keep the definition that comes first in process-environment. */
for (; ep != new_env; ep++)
{
char *p = *ep, *q = string;
while (1)
{
if (*q == 0)
/* The string is malformed; might as well drop it. */
goto duplicate;
if (*q != *p)
break;
if (*q == '=')
goto duplicate;
p++, q++;
}
}
*new_env++ = string;
duplicate: ;
}
*new_env = 0;
}
#ifdef WINDOWSNT
/*
* Assuming that in, out, and err are inherited, we make them stdin,
* stdout, and stderr of the child as follows:
* - Save the parent's current standard handles.
* - Set the parent's standard handles to the handles being passed in.
* (Note that _get_osfhandle() is an io.h procedure that
* maps crt file descriptors to NT file handles.)
* - Spawn the child, which inherits in, out, and err as stdin,
* stdout, and stderr.
* - Reset the parent's standard handles to the saved handles.
*
* We assume that the caller closes in, out, and err after calling us.
* (voelker)
*/
parent = GetCurrentProcess();
if (!DuplicateHandle(parent,
GetStdHandle(STD_INPUT_HANDLE),
parent,
&stdinSave,
0,
FALSE,
DUPLICATE_SAME_ACCESS)) {
report_file_error("Duplicating parent's input handle", Qnil);
}
if (!DuplicateHandle(parent,
GetStdHandle(STD_OUTPUT_HANDLE),
parent,
&stdoutSave,
0,
FALSE,
DUPLICATE_SAME_ACCESS)) {
report_file_error("Duplicating parent's output handle", Qnil);
}
if (!DuplicateHandle(parent,
GetStdHandle(STD_ERROR_HANDLE),
parent,
&stderrSave,
0,
FALSE,
DUPLICATE_SAME_ACCESS)) {
report_file_error("Duplicating parent's error handle", Qnil);
}
if (!SetStdHandle(STD_INPUT_HANDLE, (HANDLE) _get_osfhandle(in))) {
report_file_error("Changing stdin handle", Qnil);
}
if (!SetStdHandle(STD_OUTPUT_HANDLE, (HANDLE) _get_osfhandle(out))) {
report_file_error("Changing stdout handle", Qnil);
}
/*
* We lose data if we use the same handle to the pipe for stdout and
* stderr, so make a duplicate. This took a while.
*/
if (out == err) {
if (!DuplicateHandle(parent,
(HANDLE) _get_osfhandle(err),
parent,
&errHandle,
0,
TRUE,
DUPLICATE_SAME_ACCESS)) {
report_file_error("Duplicating out handle to make err handle.",
Qnil);
}
} else {
errHandle = (HANDLE) _get_osfhandle(err);
}
if (!SetStdHandle(STD_ERROR_HANDLE, errHandle)) {
report_file_error("Changing stderr handle", Qnil);
}
#else /* !WINDOWSNT */
/* Make sure that in, out, and err are not actually already in
descriptors zero, one, or two; this could happen if Emacs is
started with its standard in, our, or error closed, as might
happen under X. */
in = relocate_fd (in, 3);
out = relocate_fd (out, 3);
err = relocate_fd (err, 3);
close (0);
close (1);
close (2);
dup2 (in, 0);
dup2 (out, 1);
dup2 (err, 2);
close (in);
close (out);
close (err);
#endif /* !WINDOWSNT */
#if !defined (IRIX)
#if defined (USG)
setpgrp (); /* No arguments but equivalent in this case */
#else
#ifndef WINDOWSNT
setpgrp (pid, pid);
#endif /* !WINDOWSNT */
#endif /* USG */
#endif /* IRIX */
setpgrp_of_tty (pid);
#ifdef vipc
something missing here;
#endif /* vipc */
#ifdef WINDOWSNT
/*
* Spawn the child. (See ntproc.c:Spawnve()).
*/
*cpid = spawnve (_P_NOWAIT, new_argv[0], new_argv, env);
if (*cpid == -1) {
report_file_error("Spawning child process", Qnil);
}
/*
* Reset our handles.
*/
if (!SetStdHandle(STD_INPUT_HANDLE, stdinSave)) {
report_file_error("Resetting input handle", Qnil);
}
if (!SetStdHandle(STD_OUTPUT_HANDLE, stdoutSave)) {
report_file_error("Resetting output handle", Qnil);
}
if (!SetStdHandle(STD_ERROR_HANDLE, stderrSave)) {
report_file_error("Resetting error handle", Qnil);
}
if (out == err) {
/*
* If out and err are the same handle, then we duplicated out
* and stuck it in errHandle. Close the duplicate to clean up.
*/
if (!CloseHandle(errHandle)) {
report_file_error("Closing error handle duplicated from out.", Qnil);
}
}
#else /* !WINDOWSNT */
/* execvp does not accept an environment arg so the only way
to pass this environment is to set environ. Our caller
is responsible for restoring the ambient value of environ. */
environ = env;
execvp (new_argv[0], new_argv);
write (1, "Couldn't exec the program ", 26);
write (1, new_argv[0], strlen (new_argv[0]));
_exit (1);
#endif /* !WINDOWSNT */
}
/* Move the file descriptor FD so that its number is not less than MIN.
If the file descriptor is moved at all, the original is freed. */
int
relocate_fd (fd, min)
int fd, min;
{
if (fd >= min)
return fd;
else
{
int new = dup (fd);
if (new == -1)
{
char *message1 = "Error while setting up child: ";
char *message2 = "\n";
write (2, message1, strlen (message1));
write (2, sys_errlist[errno], strlen (sys_errlist[errno]));
write (2, message2, strlen (message2));
_exit (1);
}
/* Note that we hold the original FD open while we recurse,
to guarantee we'll get a new FD if we need it. */
new = relocate_fd (new, min);
close (fd);
return new;
}
}
static int
getenv_internal (var, varlen, value, valuelen)
char *var;
int varlen;
char **value;
int *valuelen;
{
Lisp_Object scan;
for (scan = Vprocess_environment; CONSP (scan); scan = XCONS (scan)->cdr)
{
Lisp_Object entry = XCONS (scan)->car;
if (XTYPE (entry) == Lisp_String
&& XSTRING (entry)->size > varlen
&& XSTRING (entry)->data[varlen] == '='
&& ! bcmp (XSTRING (entry)->data, var, varlen))
{
*value = (char *) XSTRING (entry)->data + (varlen + 1);
*valuelen = XSTRING (entry)->size - (varlen + 1);
return 1;
}
}
return 0;
}
DEFUN ("getenv", Fgetenv, Sgetenv, 1, 2, 0,
"Return the value of environment variable VAR, as a string.\n\
VAR should be a string. Value is nil if VAR is undefined in the environment.\n\
This function consults the variable ``process-environment'' for its value.")
(var)
Lisp_Object var;
{
char *value;
int valuelen;
CHECK_STRING (var, 0);
if (getenv_internal (XSTRING (var)->data, XSTRING (var)->size,
&value, &valuelen))
return make_string (value, valuelen);
else
return Qnil;
}
/* A version of getenv that consults process_environment, easily
callable from C. */
char *
egetenv (var)
char *var;
{
char *value;
int valuelen;
if (getenv_internal (var, strlen (var), &value, &valuelen))
return value;
else
return 0;
}
#endif /* not VMS */
_VOID_
init_callproc ()
{
register char * sh;
Lisp_Object tempdir;
{
char *data_dir = egetenv ("EMACSDATA");
Vdata_directory =
Ffile_name_as_directory
(build_string (data_dir ? data_dir : PATH_DATA));
}
/* Check the EMACSPATH environment variable, defaulting to the
PATH_EXEC path from paths.h. */
Vexec_path = decode_env_path ("EMACSPATH", PATH_EXEC);
Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path));
Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path);
tempdir = Fdirectory_file_name (Vexec_directory);
if (access (XSTRING (tempdir)->data, 0) < 0)
{
printf ("Warning: arch-dependent data dir (%s) does not exist.\n",
XSTRING (Vexec_directory)->data);
sleep (2);
}
tempdir = Fdirectory_file_name (Vdata_directory);
if (access (XSTRING (tempdir)->data, 0) < 0)
{
printf ("Warning: arch-independent data dir (%s) does not exist.\n",
XSTRING (Vdata_directory)->data);
sleep (2);
}
#ifdef VMS
Vshell_file_name = build_string ("*dcl*");
#else /* !VMS */
sh = (char *) getenv ("SHELL");
#ifdef WINDOWSNT
Vshell_file_name = build_string (sh ? sh : "cmd.exe");
#else /* !WINDOWSNT */
Vshell_file_name = build_string (sh ? sh : "/bin/sh");
#endif /* !WINDOWSNT */
#endif /* !VMS */
}
_VOID_
set_process_environment ()
{
register char **envp;
Vprocess_environment = Qnil;
#ifndef CANNOT_DUMP
if (initialized)
#endif
for (envp = environ; *envp; envp++)
Vprocess_environment = Fcons (build_string (*envp),
Vprocess_environment);
}
_VOID_
syms_of_callproc ()
{
DEFVAR_LISP ("shell-file-name", &Vshell_file_name,
"*File name to load inferior shells from.\n\
Initialized from the SHELL environment variable.");
DEFVAR_LISP ("exec-path", &Vexec_path,
"*List of directories to search programs to run in subprocesses.\n\
Each element is a string (directory name) or nil (try default directory).");
DEFVAR_LISP ("exec-directory", &Vexec_directory,
"Directory of architecture-dependent files that come with GNU Emacs,\n\
especially executable programs intended for Emacs to invoke.");
DEFVAR_LISP ("data-directory", &Vdata_directory,
"Directory of architecture-independent files that come with GNU Emacs,\n\
intended for Emacs to use.");
DEFVAR_LISP ("configure-info-directory", &Vconfigure_info_directory,
"For internal use by the build procedure only.\n\
This is the name of the directory in which the build procedure installed\n\
Emacs's info files; the default value for Info-default-directory-list\n\
includes this.");
#ifdef WINDOWSNT
{
char *infoPath = getenv("EMACSINFOPATH");
Vconfigure_info_directory = build_string (infoPath ? infoPath : PATH_INFO);
}
#else /* !WINDOWSNT */
Vconfigure_info_directory = build_string (PATH_INFO);
#endif /* !WINDOWSNT */
DEFVAR_LISP ("process-environment", &Vprocess_environment,
"List of environment variables for subprocesses to inherit.\n\
Each element should be a string of the form ENVVARNAME=VALUE.\n\
The environment which Emacs inherits is placed in this variable\n\
when Emacs starts.");
#ifndef VMS
defsubr (&Scall_process);
defsubr (&Sgetenv);
#endif
defsubr (&Scall_process_region);
}