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Annotation of 43BSDReno/contrib/emacs-18.55/src/callproc.c, revision 1.1

1.1     ! root        1: /* Synchronous subprocess invocation for GNU Emacs.
        !             2:    Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU Emacs.
        !             5: 
        !             6: GNU Emacs is distributed in the hope that it will be useful,
        !             7: but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: accepts responsibility to anyone for the consequences of using it
        !             9: or for whether it serves any particular purpose or works at all,
        !            10: unless he says so in writing.  Refer to the GNU Emacs General Public
        !            11: License for full details.
        !            12: 
        !            13: Everyone is granted permission to copy, modify and redistribute
        !            14: GNU Emacs, but only under the conditions described in the
        !            15: GNU Emacs General Public License.   A copy of this license is
        !            16: supposed to have been given to you along with GNU Emacs so you
        !            17: can know your rights and responsibilities.  It should be in a
        !            18: file named COPYING.  Among other things, the copyright notice
        !            19: and this notice must be preserved on all copies.  */
        !            20: 
        !            21: 
        !            22: #include <signal.h>
        !            23: 
        !            24: #include "config.h"
        !            25: 
        !            26: #include <sys/types.h>
        !            27: #define PRIO_PROCESS 0
        !            28: #include <sys/file.h>
        !            29: #ifdef USG5
        !            30: #include <fcntl.h>
        !            31: #endif
        !            32: 
        !            33: #ifndef O_RDONLY
        !            34: #define O_RDONLY 0
        !            35: #endif
        !            36: 
        !            37: #ifndef O_WRONLY
        !            38: #define O_WRONLY 1
        !            39: #endif
        !            40: 
        !            41: #include "lisp.h"
        !            42: #include "commands.h"
        !            43: #include "buffer.h"
        !            44: #include "paths.h"
        !            45: 
        !            46: #define max(a, b) ((a) > (b) ? (a) : (b))
        !            47: 
        !            48: Lisp_Object Vexec_path, Vexec_directory;
        !            49: 
        !            50: Lisp_Object Vshell_file_name;
        !            51: 
        !            52: #ifndef MAINTAIN_ENVIRONMENT
        !            53: /* List of strings to append to front of environment of
        !            54:    all subprocesses when they are started.  */
        !            55: 
        !            56: Lisp_Object Vprocess_environment;
        !            57: #endif
        !            58: 
        !            59: #ifdef BSD4_1
        !            60: /* Set nonzero when a synchronous subprocess is made,
        !            61:    and set to zero again when it is observed to die.
        !            62:    We wait for this to be zero in order to wait for termination.  */
        !            63: int synch_process_pid;
        !            64: #endif /* BSD4_1 */
        !            65: 
        !            66: Lisp_Object
        !            67: call_process_cleanup (fdpid)
        !            68:      Lisp_Object fdpid;
        !            69: {
        !            70:   register Lisp_Object fd, pid;
        !            71:   fd = Fcar (fdpid);
        !            72:   pid = Fcdr (fdpid);
        !            73:   close (XFASTINT (fd));
        !            74:   kill (XFASTINT (pid), SIGKILL);
        !            75:   return Qnil;
        !            76: }
        !            77: 
        !            78: #ifdef VMS
        !            79: extern noshare char **environ;
        !            80: #else
        !            81: extern char **environ;
        !            82: #endif
        !            83: 
        !            84: DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0,
        !            85:   "Call PROGRAM in separate process.\n\
        !            86: Program's input comes from file INFILE (nil means /dev/null).\n\
        !            87: Insert output in BUFFER before point; t means current buffer;\n\
        !            88:  nil for BUFFER means discard it; 0 means discard and don't wait.\n\
        !            89: Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
        !            90: Remaining arguments are strings passed as command arguments to PROGRAM.\n\
        !            91: This function waits for PROGRAM to terminate;\n\
        !            92: if you quit, the process is killed.")
        !            93:   (nargs, args)
        !            94:      int nargs;
        !            95:      register Lisp_Object *args;
        !            96: {
        !            97:   Lisp_Object display, buffer, path;
        !            98:   int fd[2];
        !            99:   int filefd;
        !           100:   register int pid;
        !           101:   char buf[1024];
        !           102:   int count = specpdl_ptr - specpdl;
        !           103:   register unsigned char **new_argv
        !           104:     = (unsigned char **) alloca ((max (2, nargs - 2)) * sizeof (char *));
        !           105:   struct buffer *old = bf_cur;
        !           106: 
        !           107:   CHECK_STRING (args[0], 0);
        !           108: 
        !           109:   if (nargs <= 1 || NULL (args[1]))
        !           110: #ifdef VMS
        !           111:     args[1] = build_string ("NLA0:");
        !           112: #else
        !           113:     args[1] = build_string ("/dev/null");
        !           114: #endif /* not VMS */
        !           115:   else
        !           116:     args[1] = Fexpand_file_name (args[1], bf_cur->directory);
        !           117: 
        !           118:   CHECK_STRING (args[1], 1);
        !           119: 
        !           120:   {
        !           121:     register Lisp_Object tem;
        !           122:     buffer = tem = args[2];
        !           123:     if (nargs <= 2)
        !           124:       buffer = Qnil;
        !           125:     else if (!(EQ (tem, Qnil) || EQ (tem, Qt)
        !           126:               || XFASTINT (tem) == 0))
        !           127:       {
        !           128:        buffer = Fget_buffer (tem);
        !           129:        CHECK_BUFFER (buffer, 2);
        !           130:       }
        !           131:   }
        !           132: 
        !           133:   display = nargs >= 3 ? args[3] : Qnil;
        !           134: 
        !           135:   {
        !           136:     register int i;
        !           137:     for (i = 4; i < nargs; i++)
        !           138:       {
        !           139:        CHECK_STRING (args[i], i);
        !           140:        new_argv[i - 3] = XSTRING (args[i])->data;
        !           141:       }
        !           142:     /* Program name is first command arg */
        !           143:     new_argv[0] = XSTRING (args[0])->data;
        !           144:     new_argv[i - 3] = 0;
        !           145:   }
        !           146: 
        !           147:   filefd = open (XSTRING (args[1])->data, O_RDONLY, 0);
        !           148:   if (filefd < 0)
        !           149:     {
        !           150:       report_file_error ("Opening process input file", Fcons (args[1], Qnil));
        !           151:     }
        !           152:   /* Search for program; barf if not found.  */
        !           153:   openp (Vexec_path, args[0], "", &path, 1);
        !           154:   if (NULL (path))
        !           155:     {
        !           156:       close (filefd);
        !           157:       report_file_error ("Searching for program", Fcons (args[0], Qnil));
        !           158:     }
        !           159:   new_argv[0] = XSTRING (path)->data;
        !           160: 
        !           161:   if (XTYPE (buffer) == Lisp_Int)
        !           162: #ifdef VMS
        !           163:     fd[1] = open ("NLA0:", 0), fd[0] = -1;
        !           164: #else
        !           165:     fd[1] = open ("/dev/null", O_WRONLY), fd[0] = -1;
        !           166: #endif /* not VMS */
        !           167:   else
        !           168:     {
        !           169:       pipe (fd);
        !           170: #if 0
        !           171:       /* Replaced by close_process_descs */
        !           172:       set_exclusive_use (fd[0]);
        !           173: #endif
        !           174:     }
        !           175: 
        !           176:   {
        !           177:     /* child_setup must clobber environ in systems with true vfork.
        !           178:        Protect it from permanent change.  */
        !           179:     register char **save_environ = environ;
        !           180:     register int fd1 = fd[1];
        !           181:     char **env;
        !           182: 
        !           183: #ifdef MAINTAIN_ENVIRONMENT
        !           184:     env = (char **) alloca (size_of_current_environ ());
        !           185:     get_current_environ (env);
        !           186: #else
        !           187:     env = environ;
        !           188: #endif /* MAINTAIN_ENVIRONMENT */
        !           189: 
        !           190:     pid = vfork ();
        !           191: #ifdef BSD4_1
        !           192:     /* cause SIGCHLD interrupts to look for this pid. */
        !           193:     synch_process_pid = pid;
        !           194: #endif /* BSD4_1 */
        !           195: 
        !           196:     if (pid == 0)
        !           197:       {
        !           198:        if (fd[0] >= 0)
        !           199:          close (fd[0]);
        !           200: #ifdef USG
        !           201: #ifdef HAVE_PTYS
        !           202:        setpgrp ();
        !           203: #endif
        !           204: #endif
        !           205:        child_setup (filefd, fd1, fd1, new_argv, env);
        !           206:       }
        !           207: 
        !           208:     environ = save_environ;
        !           209: 
        !           210:     close (filefd);
        !           211:     close (fd1);
        !           212:   }
        !           213: 
        !           214:   if (pid < 0)
        !           215:     {
        !           216:       close (fd[0]);
        !           217:       report_file_error ("Doing vfork", Qnil);
        !           218:     }
        !           219: 
        !           220:   if (XTYPE (buffer) == Lisp_Int)
        !           221:     {
        !           222: #ifndef subprocesses
        !           223:       wait_without_blocking ();
        !           224: #endif subprocesses
        !           225:       return Qnil;
        !           226:     }
        !           227: 
        !           228:   record_unwind_protect (call_process_cleanup,
        !           229:                         Fcons (make_number (fd[0]), make_number (pid)));
        !           230: 
        !           231: 
        !           232:   if (XTYPE (buffer) == Lisp_Buffer)
        !           233:     Fset_buffer (buffer);
        !           234: 
        !           235:   immediate_quit = 1;
        !           236:   QUIT;
        !           237: 
        !           238:   {
        !           239:     register int nread;
        !           240: 
        !           241:     while ((nread = read (fd[0], buf, sizeof buf)) > 0)
        !           242:       {
        !           243:        immediate_quit = 0;
        !           244:        if (!NULL (buffer))
        !           245:          InsCStr (buf, nread);
        !           246:        if (!NULL (display) && INTERACTIVE)
        !           247:          DoDsp (1);
        !           248:        immediate_quit = 1;
        !           249:        QUIT;
        !           250:       }
        !           251:   }
        !           252: 
        !           253:   /* Wait for it to terminate, unless it already has.  */
        !           254:   wait_for_termination (pid);
        !           255: 
        !           256:   immediate_quit = 0;
        !           257: 
        !           258:   SetBfp (old);
        !           259: 
        !           260:   unbind_to (count);
        !           261: 
        !           262:   return Qnil;
        !           263: }
        !           264: 
        !           265: DEFUN ("call-process-region", Fcall_process_region, Scall_process_region,
        !           266:   3, MANY, 0,
        !           267:   "Send text from START to END to a process running PROGRAM.\n\
        !           268: Delete the text if DELETE is non-nil.\n\
        !           269: Put output in BUFFER, before point.  nil => discard it, t => current buffer.\n\
        !           270: Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
        !           271: Remaining args are passed to PROGRAM at startup as command args.\n\
        !           272: This function normally waits for the process to terminate;\n\
        !           273: if you quit, the process is killed.")
        !           274:   (nargs, args)
        !           275:      int nargs;
        !           276:      register Lisp_Object *args;
        !           277: {
        !           278:   register Lisp_Object filename_string, start, end;
        !           279:   char tempfile[20];
        !           280: 
        !           281:   strcpy (tempfile, "/tmp/emacsXXXXXX");
        !           282:   mktemp (tempfile);
        !           283: 
        !           284:   filename_string = build_string (tempfile);
        !           285:   start = args[0];
        !           286:   end = args[1];
        !           287:   Fwrite_region (start, end, filename_string, Qnil, Qlambda);
        !           288: 
        !           289:   if (!NULL (args[3]))
        !           290:     Fdelete_region (start, end);
        !           291: 
        !           292:   args[3] = filename_string;
        !           293:   Fcall_process (nargs - 2, args + 2);
        !           294:   unlink (tempfile);
        !           295:   return Qnil;
        !           296: }
        !           297: 
        !           298: /* This is the last thing run in a newly forked inferior
        !           299:    either synchronous or asynchronous.
        !           300:    Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
        !           301:    Initialize inferior's priority, pgrp, connected dir and environment.
        !           302:    then exec another program based on new_argv.
        !           303: 
        !           304:    This function may change environ for the superior process.
        !           305:    Therefore, the superior process must save and restore the value
        !           306:    of environ around the vfork and the call to this function.
        !           307: 
        !           308:    ENV is the environment */
        !           309: 
        !           310: child_setup (in, out, err, new_argv, env)
        !           311:      int in, out, err;
        !           312:      register char **new_argv;
        !           313:      char **env;
        !           314: {
        !           315:   register int pid = getpid();
        !           316: 
        !           317:   setpriority (PRIO_PROCESS, pid, 0);
        !           318: 
        !           319: #ifdef subprocesses
        !           320:   /* Close Emacs's descriptors that this process should not have.  */
        !           321:   close_process_descs ();
        !           322: #endif
        !           323: 
        !           324:   /* Note that use of alloca is always safe here.  It's obvious for systems
        !           325:      that do not have true vfork or that have true (stack) alloca.
        !           326:      If using vfork and C_ALLOCA it is safe because that changes
        !           327:      the superior's static variables as if the superior had done alloca
        !           328:      and will be cleaned up in the usual way.  */
        !           329: 
        !           330:   if (XTYPE (bf_cur->directory) == Lisp_String)
        !           331:     {
        !           332:       register unsigned char *temp;
        !           333:       register int i;
        !           334: 
        !           335:       i = XSTRING (bf_cur->directory)->size;
        !           336:       temp = (unsigned char *) alloca (i + 2);
        !           337:       bcopy (XSTRING (bf_cur->directory)->data, temp, i);
        !           338:       if (temp[i - 1] != '/') temp[i++] = '/';
        !           339:       temp[i] = 0;
        !           340:       chdir (temp);
        !           341:     }
        !           342: 
        !           343: #ifndef MAINTAIN_ENVIRONMENT
        !           344:   /* Set `env' to a vector of the strings in Vprocess_environment.  */
        !           345:   {
        !           346:     register Lisp_Object tem;
        !           347:     register char **new_env;
        !           348:     register int new_length;
        !           349: 
        !           350:     new_length = 0;
        !           351:     for (tem = Vprocess_environment;
        !           352:         (XTYPE (tem) == Lisp_Cons
        !           353:          && XTYPE (XCONS (tem)->car) == Lisp_String);
        !           354:         tem = XCONS (tem)->cdr)
        !           355:       new_length++;
        !           356: 
        !           357:     /* new_length + 1 to include terminating 0 */
        !           358:     env = new_env = (char **) alloca ((new_length + 1) * sizeof (char *));
        !           359: 
        !           360:     /* Copy the env strings into new_env.  */
        !           361:     for (tem = Vprocess_environment;
        !           362:         (XTYPE (tem) == Lisp_Cons
        !           363:          && XTYPE (XCONS (tem)->car) == Lisp_String);
        !           364:         tem = XCONS (tem)->cdr)
        !           365:       *new_env++ = (char *) XSTRING (XCONS (tem)->car)->data;
        !           366:     *new_env = 0;
        !           367:   }
        !           368: #endif /* Not MAINTAIN_ENVIRONMENT */
        !           369: 
        !           370:   close (0);
        !           371:   close (1);
        !           372:   close (2);
        !           373: 
        !           374:   dup2 (in, 0);
        !           375:   dup2 (out, 1);
        !           376:   dup2 (err, 2);
        !           377:   close (in);
        !           378:   close (out);
        !           379:   close (err);
        !           380: 
        !           381: #ifdef USG
        !           382: #ifndef HAVE_PTYS
        !           383:   setpgrp ();                  /* No arguments but equivalent in this case */
        !           384: #endif
        !           385: #else
        !           386:   setpgrp (pid, pid);
        !           387: #endif /* USG */
        !           388:   setpgrp_of_tty (pid);
        !           389: 
        !           390: #ifdef vipc
        !           391:   something missing here;
        !           392: #endif vipc
        !           393: 
        !           394:   /* execvp does not accept an environment arg so the only way
        !           395:      to pass this environment is to set environ.  Our caller
        !           396:      is responsible for restoring the ambient value of environ.  */
        !           397:   environ = env;
        !           398:   execvp (new_argv[0], new_argv);
        !           399: 
        !           400:   write (1, "Couldn't exec the program ", 26);
        !           401:   write (1, new_argv[0], strlen (new_argv[0]));
        !           402:   _exit (1);
        !           403: }
        !           404: 
        !           405: init_callproc ()
        !           406: {
        !           407:   register char * sh;
        !           408:   extern char **environ;
        !           409:   register char **envp;
        !           410:   Lisp_Object execdir;
        !           411: 
        !           412:   /* Turn PATH_EXEC into a path.  `==' is just a string which we know
        !           413:      will not be the name of an environment variable.  */
        !           414:   Vexec_path = decode_env_path ("==", PATH_EXEC);
        !           415:   Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path));
        !           416:   Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path);
        !           417: 
        !           418:   execdir = Fdirectory_file_name (Vexec_directory);
        !           419:   if (access (XSTRING (execdir)->data, 0) < 0)
        !           420:     {
        !           421:       printf ("Warning: executable/documentation dir (%s) does not exist.\n",
        !           422:              XSTRING (Vexec_directory)->data);
        !           423:       sleep (2);
        !           424:     }
        !           425: 
        !           426:   sh = (char *) egetenv ("SHELL");
        !           427:   Vshell_file_name = build_string (sh ? sh : "/bin/sh");
        !           428: 
        !           429: #ifndef MAINTAIN_ENVIRONMENT
        !           430:   /* The equivalent of this operation was done
        !           431:      in init_environ in environ.c if MAINTAIN_ENVIRONMENT */
        !           432:   Vprocess_environment = Qnil;
        !           433: #ifndef CANNOT_DUMP
        !           434:   if (initialized)
        !           435: #endif
        !           436:     for (envp = environ; *envp; envp++)
        !           437:       Vprocess_environment = Fcons (build_string (*envp),
        !           438:                                    Vprocess_environment);
        !           439: #endif /* MAINTAIN_ENVIRONMENT */
        !           440: }
        !           441: 
        !           442: syms_of_callproc ()
        !           443: {
        !           444:   DEFVAR_LISP ("shell-file-name", &Vshell_file_name,
        !           445:     "*File name to load inferior shells from.\n\
        !           446: Initialized from the SHELL environment variable.");
        !           447: 
        !           448:   DEFVAR_LISP ("exec-path", &Vexec_path,
        !           449:     "*List of directories to search programs to run in subprocesses.\n\
        !           450: Each element is a string (directory name) or nil (try default directory).");
        !           451: 
        !           452:   DEFVAR_LISP ("exec-directory", &Vexec_directory,
        !           453:     "Directory that holds programs that come with GNU Emacs,\n\
        !           454: intended for Emacs to invoke.");
        !           455: 
        !           456: #ifndef MAINTAIN_ENVIRONMENT
        !           457:   DEFVAR_LISP ("process-environment", &Vprocess_environment,
        !           458:     "List of strings to append to environment of subprocesses that are started.\n\
        !           459: Each string should have the format ENVVARNAME=VALUE.");
        !           460: #endif
        !           461: 
        !           462:   defsubr (&Scall_process);
        !           463:   defsubr (&Scall_process_region);
        !           464: }

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