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Annotation of 43BSD/contrib/emacs/src/callproc.c, revision 1.1

1.1     ! root        1: /* Synchronous subprocess invocation for GNU Emacs.
        !             2:    Copyright (C) 1985 Richard M. Stallman.
        !             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: #include "lisp.h"
        !            38: #include "commands.h"
        !            39: #include "buffer.h"
        !            40: #include "paths.h"
        !            41: 
        !            42: #define max(a, b) ((a) > (b) ? (a) : (b))
        !            43: 
        !            44: Lisp_Object Vexec_path, Vexec_directory;
        !            45: 
        !            46: Lisp_Object Vshell_file_name;
        !            47: 
        !            48: #ifdef BSD4_1
        !            49: /* Set nonzero when a synchronous subprocess is made,
        !            50:    and set to zero again when it is observed to die.
        !            51:    We wait for this to be zero in order to wait for termination.  */
        !            52: int synch_process_pid;
        !            53: #endif /* BSD4_1 */
        !            54: 
        !            55: Lisp_Object
        !            56: call_process_cleanup (fdpid)
        !            57:      Lisp_Object fdpid;
        !            58: {
        !            59:   Lisp_Object fd, pid;
        !            60:   fd = Fcar (fdpid);
        !            61:   pid = Fcdr (fdpid);
        !            62:   close (XFASTINT (fd));
        !            63:   kill (XFASTINT (pid), SIGKILL);
        !            64:   return Qnil;
        !            65: }
        !            66: 
        !            67: DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0,
        !            68:   "Call PROGRAM in separate process.\n\
        !            69: Program's input comes from file INFILE (nil means /dev/null).\n\
        !            70: Insert output in BUFFER before point; t means current buffer;\n\
        !            71:  nil for BUFFER means discard it; 0 means discard and don't wait.\n\
        !            72: Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
        !            73: Remaining arguments are strings passed as command arguments to PROGRAM.\n\
        !            74: This function waits for PROGRAM to terminate;\n\
        !            75: if you quit, the process is killed.")
        !            76:   (nargs, args)
        !            77:      int nargs;
        !            78:      Lisp_Object *args;
        !            79: {
        !            80:   Lisp_Object display, buffer, tem, tem1;
        !            81:   int fd[2];
        !            82:   int filefd;
        !            83:   int pid;
        !            84:   register int nread;
        !            85:   char buf[1024];
        !            86:   int count = specpdl_ptr - specpdl;
        !            87:   register int i;
        !            88:   register unsigned char **new_argv
        !            89:     = (unsigned char **) alloca ((max (2, nargs - 2)) * sizeof (char *));
        !            90:   struct buffer *old = bf_cur;
        !            91: 
        !            92:   tem = args[0];
        !            93:   CHECK_STRING (tem, 0);
        !            94: 
        !            95:   if (nargs <= 1 || NULL (args[1]))
        !            96:     args[1] = build_string ("/dev/null");
        !            97:   else
        !            98:     tem = args[1],
        !            99:     args[1] = Fexpand_file_name (tem, bf_cur->directory);
        !           100:   tem = args[1];
        !           101:   CHECK_STRING (tem, 1);
        !           102: 
        !           103:   if (nargs <= 2 || NULL (args[2]))
        !           104:     buffer = Qnil;
        !           105:   else if (EQ (args[2], Qt))
        !           106:     buffer = Qt;
        !           107:   else if (XFASTINT (args[2]) == 0)
        !           108:     buffer = args[2];
        !           109:   else
        !           110:     {
        !           111:       tem = args[2];
        !           112:       buffer = Fget_buffer (tem);
        !           113:       CHECK_BUFFER (buffer, 2);
        !           114:     }
        !           115: 
        !           116:   display = nargs >= 3 ? args[3] : Qnil;
        !           117: 
        !           118:   for (i = 4; i < nargs; i++)
        !           119:     {
        !           120:       tem = args[i];
        !           121:       CHECK_STRING (tem, i);
        !           122:       new_argv[i - 3] = XSTRING (args[i])->data;
        !           123:     }
        !           124:   /* Program name is first command arg */
        !           125:   new_argv[0] = XSTRING (args[0])->data;
        !           126:   new_argv[i - 3] = 0;
        !           127: 
        !           128:   filefd = open (XSTRING (args[1])->data, O_RDONLY, 0);
        !           129:   if (filefd < 0)
        !           130:     {
        !           131:       tem = args[1];
        !           132:       report_file_error ("Opening process input file", Fcons (tem, Qnil));
        !           133:     }
        !           134:   /* Search for program; barf if not found.  */
        !           135:   tem1 = args[0];
        !           136:   openp (Vexec_path, tem1, "", &tem, 1);
        !           137:   if (NULL (tem))
        !           138:     {
        !           139:       close (filefd);
        !           140:       report_file_error ("Searching for program", Fcons (tem1, Qnil));
        !           141:     }
        !           142:   new_argv[0] = XSTRING (tem)->data;
        !           143: 
        !           144:   if (XTYPE (buffer) == Lisp_Int)
        !           145:     fd[1] = open ("/dev/null", 0), fd[0] = -1;
        !           146:   else
        !           147:     {
        !           148:       pipe (fd);
        !           149:       set_exclusive_use (fd[0]);
        !           150:     }
        !           151: 
        !           152:   pid = vfork();
        !           153: #ifdef BSD4_1
        !           154:   /* cause SIGCHLD interrupts to look for this pid. */
        !           155:   synch_process_pid = pid;
        !           156: #endif /* BSD4_1 */
        !           157: 
        !           158:   if (!pid)
        !           159:     child_setup (filefd, fd[1], fd[1], new_argv);
        !           160: 
        !           161:   close (filefd);
        !           162:   close (fd[1]);
        !           163: 
        !           164:   if (pid < 0)
        !           165:     {
        !           166:       close (fd[0]);
        !           167:       report_file_error ("Doing vfork", Qnil);
        !           168:     }
        !           169: 
        !           170:   if (XTYPE (buffer) == Lisp_Int)
        !           171:     {
        !           172: #ifndef subprocesses
        !           173:       wait_without_blocking ();
        !           174: #endif subprocesses
        !           175:       return Qnil;
        !           176:     }
        !           177: 
        !           178:   record_unwind_protect (call_process_cleanup,
        !           179:                         Fcons (make_number (fd[0]), make_number (pid)));
        !           180: 
        !           181: 
        !           182:   if (XTYPE (buffer) == Lisp_Buffer)
        !           183:     Fset_buffer (buffer);
        !           184: 
        !           185:   immediate_quit = 1;
        !           186:   QUIT;
        !           187:   while ((nread = read (fd[0], buf, sizeof buf)) > 0)
        !           188:     {
        !           189:       immediate_quit = 0;
        !           190:       if (!NULL (buffer))
        !           191:        InsCStr (buf, nread);
        !           192:       if (!NULL (display) && INTERACTIVE)
        !           193:        DoDsp (1);
        !           194:       immediate_quit = 1;
        !           195:       QUIT;
        !           196:     }
        !           197: 
        !           198:   /* Wait for it to terminate, unless it already has.  */
        !           199:   wait_for_termination (pid);
        !           200: 
        !           201:   immediate_quit = 0;
        !           202: 
        !           203:   SetBfp (old);
        !           204: 
        !           205:   unbind_to (count);
        !           206: 
        !           207:   return Qnil;
        !           208: }
        !           209: 
        !           210: child_setup (in, out, err, new_argv)
        !           211:      int in, out, err;
        !           212:      char **new_argv;
        !           213: {
        !           214:   int pid = getpid();
        !           215:   register int i;
        !           216:   unsigned char *temp;
        !           217: 
        !           218:   child_setup_tty (out);
        !           219: 
        !           220:   setpriority (PRIO_PROCESS, pid, 0);
        !           221: 
        !           222:   if (XTYPE (bf_cur->directory) == Lisp_String)
        !           223:     {
        !           224:       temp = (unsigned char *) alloca (XSTRING (bf_cur->directory)->size + 2);
        !           225:       bcopy (XSTRING (bf_cur->directory)->data, temp,
        !           226:             XSTRING (bf_cur->directory)->size);
        !           227:       i = XSTRING (bf_cur->directory)->size;
        !           228:       if (temp[i - 1] != '/') temp[i++] = '/';
        !           229:       temp[i] = 0;
        !           230:       chdir (temp);
        !           231:     }
        !           232: 
        !           233:   close (0);
        !           234:   close (1);
        !           235:   close (2);
        !           236: 
        !           237:   dup2 (in, 0);
        !           238:   dup2 (out, 1);
        !           239:   dup2 (err, 2);
        !           240: 
        !           241: #ifdef USG
        !           242:   setpgrp ();                  /* No arguments but equivalent in this case */
        !           243: #else
        !           244:   setpgrp (pid, pid);
        !           245: #endif /* USG */
        !           246:   setpgrp_of_tty (pid);
        !           247: 
        !           248: #ifdef vipc
        !           249:   something missing here;
        !           250: #endif vipc
        !           251: 
        !           252:   execvp (new_argv[0], new_argv);
        !           253:   write (1, "Couldn't exec the program ", 26);
        !           254:   write (1, new_argv[0], strlen (new_argv[0]));
        !           255:   _exit (1);
        !           256: }
        !           257: 
        !           258: DEFUN ("call-process-region", Fcall_process_region, Scall_process_region,
        !           259:   3, MANY, 0,
        !           260:   "Send text from START to END to a process running PROGRAM.\n\
        !           261: Delete the text if DELETE is non-nil.\n\
        !           262: Put output in BUFFER, before point.  nil => discard it, t => current buffer.\n\
        !           263: Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\
        !           264: Remaining args are passed to PROGRAM at startup as command args.\n\
        !           265: This function normally waits for the process to terminate;\n\
        !           266: if you quit, the process is killed.")
        !           267:   (nargs, args)
        !           268:      int nargs;
        !           269:      Lisp_Object *args;
        !           270: {
        !           271:   Lisp_Object filename_string, start, end;
        !           272:   char tempfile[20];
        !           273: 
        !           274:   strcpy (tempfile, "/tmp/emacsXXXXXX");
        !           275:   mktemp (tempfile);
        !           276: 
        !           277:   filename_string = build_string (tempfile);
        !           278:   start = args[0];
        !           279:   end = args[1];
        !           280:   Fwrite_region (start, end, filename_string, Qnil, Qlambda);
        !           281: 
        !           282:   if (!NULL (args[3]))
        !           283:     Fdelete_region (start, end);
        !           284: 
        !           285:   args[3] = filename_string;
        !           286:   Fcall_process (nargs - 2, args + 2);
        !           287:   unlink (tempfile);
        !           288:   return Qnil;
        !           289: }
        !           290: 
        !           291: init_callproc ()
        !           292: {
        !           293:   char *sh;
        !           294: 
        !           295:   Vexec_path = nconc2 (decode_env_path ("PATH", ""),
        !           296:                       decode_env_path ("%$&*#", PATH_EXEC));
        !           297:   Vexec_directory = build_string (PATH_EXEC);
        !           298:   Vexec_directory = concat2 (Vexec_directory, build_string ("/"));
        !           299: 
        !           300:   sh = (char *) getenv ("SHELL");
        !           301:   Vshell_file_name = build_string (sh ? sh : "/bin/sh");
        !           302: }
        !           303: 
        !           304: syms_of_callproc ()
        !           305: {
        !           306:   DefLispVar ("shell-file-name", &Vshell_file_name,
        !           307:     "*File name to load inferior shells from.\n\
        !           308: Initialized from the SHELL environment variable.");
        !           309: 
        !           310:   DefLispVar ("exec-path", &Vexec_path,
        !           311:     "*List of directories to search programs to run in subprocesses.\n\
        !           312: Each element is a string (directory name) or nil (try default directory).");
        !           313: 
        !           314:   DefLispVar ("exec-directory", &Vexec_directory,
        !           315:     "Directory that holds programs that come with GNU Emacs,\n\
        !           316: intended for Emacs to invoke.");
        !           317: 
        !           318:   defsubr (&Scall_process);
        !           319:   defsubr (&Scall_process_region);
        !           320: }

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