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- /* Synchronous subprocess invocation for GNU Emacs.
- Copyright (C) 1985, 1986, 1987, 1988, 1990 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 "config.h"
-
- #include <sys/types.h>
- #define PRIO_PROCESS 0
- #include <sys/file.h>
- #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"
-
- #define max(a, b) ((a) > (b) ? (a) : (b))
-
- Lisp_Object Vexec_path, Vexec_directory;
-
- Lisp_Object Vshell_file_name;
-
- #ifndef MAINTAIN_ENVIRONMENT
- /* List of strings to append to front of environment of
- all subprocesses when they are started. */
-
- Lisp_Object Vprocess_environment;
- #endif
-
- #ifdef BSD4_1
- /* Set nonzero when a synchronous subprocess is made,
- and set to zero again when it is observed to die.
- We wait for this to be zero in order to wait for termination. */
- int synch_process_pid;
- #endif /* BSD4_1 */
-
- /* 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;
-
- /* Exit code of synchronous subprocess if positive,
- minus the signal number if negative. */
- int synch_process_retcode;
-
- Lisp_Object
- call_process_cleanup (fdpid)
- Lisp_Object fdpid;
- {
- register Lisp_Object fd, pid;
- fd = Fcar (fdpid);
- pid = Fcdr (fdpid);
- close (XFASTINT (fd));
- kill (XFASTINT (pid), SIGKILL);
- return Qnil;
- }
-
- #ifdef VMS
- #ifdef __GNUC__
- #define environ $$PsectAttributes_NOSHR$$environ
- extern char **environ;
- #else
- extern noshare char **environ;
- #endif
- #else
- extern char **environ;
- #endif
-
- DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0,
- "Call PROGRAM in separate process.\n\
- 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\
- Otherwise waits for PROGRAM to terminate\n\
- and returns a numeric exit status or a signal name as a string.\n\
- If you quit, the process is killed with SIGKILL.")
- (nargs, args)
- int nargs;
- register Lisp_Object *args;
- {
- Lisp_Object display, buffer, path;
- int fd[2];
- int filefd;
- register int pid;
- 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;
-
- CHECK_STRING (args[0], 0);
-
- if (nargs <= 1 || NULL (args[1]))
- args[1] = build_string (PATH_NULL);
- else
- args[1] = Fexpand_file_name (args[1], current_buffer->directory);
-
- CHECK_STRING (args[1], 1);
-
- {
- register Lisp_Object tem;
- buffer = tem = args[2];
- if (nargs <= 2)
- buffer = Qnil;
- else if (!(EQ (tem, Qnil) || EQ (tem, Qt)
- || XFASTINT (tem) == 0))
- {
- buffer = Fget_buffer (tem);
- CHECK_BUFFER (buffer, 2);
- }
- }
-
- display = nargs >= 3 ? 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 (args[1])->data, O_RDONLY, 0);
- if (filefd < 0)
- {
- report_file_error ("Opening process input file", Fcons (args[1], Qnil));
- }
- /* Search for program; barf if not found. */
- openp (Vexec_path, args[0], "", &path, 1);
- if (NULL (path))
- {
- close (filefd);
- report_file_error ("Searching for program", Fcons (args[0], Qnil));
- }
- new_argv[0] = XSTRING (path)->data;
-
- if (XTYPE (buffer) == Lisp_Int)
- #ifdef VMS
- fd[1] = open (PATH_NULL, 0), fd[0] = -1;
- #else
- fd[1] = open (PATH_NULL, O_WRONLY), fd[0] = -1;
- else
- {
- pipe (fd);
- #if 0
- /* Replaced by close_process_descs */
- set_exclusive_use (fd[0]);
- #endif
- }
-
- synch_process_death = 0;
- synch_process_retcode = 0;
-
- #ifdef AMIGA
- {
- register unsigned char *temp;
-
- if (XTYPE (current_buffer->directory) == Lisp_String)
- {
- register int i;
-
- i = XSTRING (current_buffer->directory)->size;
- temp = (unsigned char *) alloca (i + 1);
- bcopy (XSTRING (current_buffer->directory)->data, temp, i);
- temp[i] = 0;
- }
- pid = exec(new_argv[0], new_argv, filefd, fd[1], temp, amiga_process_stack_size);
- }
- #else
- {
- /* 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];
- char **env;
-
- #ifdef MAINTAIN_ENVIRONMENT
- env = (char **) alloca (size_of_current_environ ());
- get_current_environ (env);
- #else
- env = environ;
- #endif /* MAINTAIN_ENVIRONMENT */
-
- pid = vfork ();
- #ifdef BSD4_1
- /* cause SIGCHLD interrupts to look for this pid. */
- synch_process_pid = pid;
- #endif /* BSD4_1 */
-
- if (pid == 0)
- {
- if (fd[0] >= 0)
- close (fd[0]);
- #ifdef USG
- #ifdef HAVE_PTYS
- setpgrp ();
- #endif
- #endif
- child_setup (filefd, fd1, fd1, new_argv, env);
- }
-
- environ = save_environ;
-
- close (filefd);
- close (fd1);
- }
- #endif /* not AMIGA */
-
- if (pid < 0)
- {
- close (fd[0]);
- report_file_error ("Doing vfork", Qnil);
- }
-
- if (XTYPE (buffer) == Lisp_Int)
- {
- #ifndef subprocesses
- wait_without_blocking ();
- #endif subprocesses
- return Qnil;
- }
-
- 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 (!NULL (buffer))
- insert (buf, nread);
- if (!NULL (display) && FROM_KBD)
- 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);
-
- if (synch_process_death)
- return build_string (synch_process_death);
- return make_number (synch_process_retcode);
- }
-
- DEFUN ("call-process-region", Fcall_process_region, Scall_process_region,
- 3, MANY, 0,
- "Send text from START to END to a process running PROGRAM.\n\
- Delete the text if 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\
- This function normally waits for the process to terminate;\n\
- if you quit, the process is killed.")
- (nargs, args)
- int nargs;
- register Lisp_Object *args;
- {
- register Lisp_Object filename_string, start, end;
- char tempfile[20];
-
- strcpy (tempfile, PATH_TEMP);
- mktemp (tempfile);
-
- filename_string = build_string (tempfile);
- start = args[0];
- end = args[1];
- Fwrite_region (start, end, filename_string, Qnil, Qlambda);
-
- if (!NULL (args[3]))
- Fdelete_region (start, end);
-
- args[3] = filename_string;
- Fcall_process (nargs - 2, args + 2);
- unlink (tempfile);
- return Qnil;
- }
- #ifndef AMIGA
-
- /* 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 */
-
- child_setup (in, out, err, new_argv, env)
- int in, out, err;
- register char **new_argv;
- char **env;
- {
- register int pid = getpid();
-
- setpriority (PRIO_PROCESS, pid, 0);
-
- #ifdef subprocesses
- /* Close Emacs's descriptors that this process should not have. */
- close_process_descs ();
- #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. */
-
- if (XTYPE (current_buffer->directory) == Lisp_String)
- {
- register unsigned char *temp;
- register int i;
-
- i = XSTRING (current_buffer->directory)->size;
- temp = (unsigned char *) alloca (i + 2);
- bcopy (XSTRING (current_buffer->directory)->data, temp, i);
- if (temp[i - 1] != '/') temp[i++] = '/';
- temp[i] = 0;
- chdir (temp);
- }
-
- #ifndef MAINTAIN_ENVIRONMENT
- /* 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 env strings into new_env. */
- for (tem = Vprocess_environment;
- (XTYPE (tem) == Lisp_Cons
- && XTYPE (XCONS (tem)->car) == Lisp_String);
- tem = XCONS (tem)->cdr)
- *new_env++ = (char *) XSTRING (XCONS (tem)->car)->data;
- *new_env = 0;
- }
- #endif /* Not MAINTAIN_ENVIRONMENT */
-
- close (0);
- close (1);
- close (2);
-
- dup2 (in, 0);
- dup2 (out, 1);
- dup2 (err, 2);
- close (in);
- close (out);
- close (err);
-
- #ifdef USG
- #ifndef HAVE_PTYS
- setpgrp (); /* No arguments but equivalent in this case */
- #endif
- #else
- setpgrp (pid, pid);
- #endif /* USG */
- setpgrp_of_tty (pid);
-
- #ifdef vipc
- something missing here;
- #endif vipc
-
- /* 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 /* not AMIGA */
-
- init_callproc ()
- {
- register char * sh;
- extern char **environ;
- register char **envp;
- Lisp_Object execdir;
-
- /* Turn PATH_EXEC into a path. Don't look at environment. */
- Vexec_path = decode_env_path (0, PATH_EXEC);
- Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path));
- Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path);
- #ifdef AMIGA
- {
- char *amiga_path(), *apath = amiga_path();
-
- Vexec_path = nconc2 (decode_env_path (0, apath), Vexec_path);
- Vexec_path = nconc2 (decode_env_path (0, "GNUEmacs:c"), Vexec_path);
- free(apath);
- }
- #endif
-
- execdir = Fdirectory_file_name (Vexec_directory);
- if (access (XSTRING (execdir)->data, 0) < 0)
- {
- printf ("Warning: executable/documentation dir (%s) does not exist.\n",
- XSTRING (Vexec_directory)->data);
- sleep (2);
- }
-
- sh = (char *) egetenv ("SHELL");
- Vshell_file_name = build_string (sh ? sh : PATH_SHELL);
-
- #ifndef MAINTAIN_ENVIRONMENT
- /* The equivalent of this operation was done
- in init_environ in environ.c if MAINTAIN_ENVIRONMENT */
- Vprocess_environment = Qnil;
- #ifndef CANNOT_DUMP
- if (initialized)
- #endif
- for (envp = environ; *envp; envp++)
- Vprocess_environment = Fcons (build_string (*envp),
- Vprocess_environment);
- #endif /* MAINTAIN_ENVIRONMENT */
- }
-
- 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 that holds programs that come with GNU Emacs,\n\
- intended for Emacs to invoke.");
-
- #ifndef MAINTAIN_ENVIRONMENT
- DEFVAR_LISP ("process-environment", &Vprocess_environment,
- "List of strings to append to environment of subprocesses that are started.\n\
- Each string should have the format ENVVARNAME=VALUE.");
- #endif
-
- defsubr (&Scall_process);
- defsubr (&Scall_process_region);
- }
-