4.3BSD - /usr/src/new/emacs/src/callproc.c

   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: }

Defined functions

Defined variables

Defined macros