added -b/--batch cmd option (__unix__ only) to detach xschem completely from console

doc/manpages/xschem.1.in

@@ -38,6 +38,10 @@ hierarchical representation of circuits with a top down approach.
 Print help and exit.
 .TP
 
+.B -n, --batch
+Detach xschem from console.
+.TP
+
 .B -n, --netlist
 Do a netlist of the given schematic cell.
 .TP

doc/xschem_man/run_xschem.html

@@ -47,6 +47,7 @@ user:~$ xschem .../xschem_library/examples/0_examples_top.sch
 usage: xschem [options] [schematic | symbol ]
 Options:
   -h  --help           Print this help.
+  -b  --batch          Detach Xschem from console.
   -n  --netlist        Do a netlist of the given schematic cell.
   -v  --version        Print version information and exit.
   -V  --vhdl           Set netlist type to VHDL.

src/globals.c

@@ -268,7 +268,7 @@ struct wireentry *wiretable[NBOXES][NBOXES];
 struct instentry *insttable[NBOXES][NBOXES];
 size_t get_tok_value_size;
 size_t get_tok_size;
-
+int batch_mode = 0; /* no tcl console if set; batch mode */
 
 #ifdef HAS_CAIRO
 cairo_surface_t *sfc, *save_sfc;

src/main.c

@@ -26,10 +26,10 @@
 #endif
 
 void sig_handler(int s){
-  #ifndef IN_MEMORY_UNDO
+#ifndef IN_MEMORY_UNDO
   char emergency_prefix[PATH_MAX];
   const char *emergency_dir;
-  #endif
+#endif
 
   /* 20150410 */
   if(s==SIGINT) {
@@ -37,7 +37,7 @@ void sig_handler(int s){
     return;
   }
 
-  #ifndef IN_MEMORY_UNDO
+#ifndef IN_MEMORY_UNDO
   /* 20180923 no more mkdtemp */
   my_snprintf(emergency_prefix, S(emergency_prefix), "xschem_emergencysave_%s_", 
            skip_dir(schematic[currentsch]));
@@ -51,7 +51,7 @@ void sig_handler(int s){
     fprintf(errfp, "rename dir %s to %s failed\n", undo_dirname, emergency_dir);
   }
   fprintf(errfp, "EMERGENCY SAVE DIR: %s\n", emergency_dir);
-  #endif
+#endif
   fprintf(errfp, "\nFATAL: signal %d\n", s);
   fprintf(errfp, "while editing: %s\n", skip_dir(schematic[currentsch]));
   exit(EXIT_FAILURE);
@@ -84,6 +84,30 @@ int main(int argc, char **argv)
   if(debug_var>=1 && !has_x) 
     fprintf(errfp, "main(): no DISPLAY set, assuming no X available\n");
 
+/* detach from console (fork a child and close std file descriptors) */
+#ifdef __unix__
+  if(batch_mode) {
+    pid_t pid = fork();
+    if(pid < 0) {
+      fprintf(errfp, "main(): fork() failed\n");
+      exit(EXIT_FAILURE);
+    }
+    if(pid == 0) {
+      /* The child becomes the daemon. */
+      /* Detach all standard I/O descriptors */
+      close(0); /* stdin */
+      close(1); /* stdout */
+      close(2); /* stderr */
+      setsid(); /* new session */
+      /* Ok, now detached */
+    }
+    else {
+      /* terminate parent */
+      exit(0);
+    }
+  }
+#endif
+
   if(has_x) Tk_Main(1, argv, Tcl_AppInit);
   else     Tcl_Main(1, argv, Tcl_AppInit);
   return 0;

src/options.c

@@ -129,6 +129,9 @@ void check_opt(char *opt, char *optval, int type)
         dbg(1, "process_options(): set netlist type to verilog\n");
         netlist_type=CAD_VERILOG_NETLIST;
 
+    } else if( (type == SHORT && *opt == 'b') || (type == LONG && !strcmp("batch", opt)) ) {
+        batch_mode = 1;
+
     } else if( (type == SHORT && *opt == 'v') || (type == LONG && !strcmp("version", opt)) ) {
         print_version();
 

src/xinit.c

@@ -1454,7 +1454,11 @@ int Tcl_AppInit(Tcl_Interp *inter)
  /* */
 
 
- if(!no_readline) {
+ if(
+#ifdef __unix__
+    !batch_mode && 
+#endif
+    !no_readline) {
    tcleval( "if {![catch {package require tclreadline}]} "
       "{::tclreadline::readline customcompleter  completer; ::tclreadline::Loop }" ) ;
  }

src/xschem.h

@@ -674,7 +674,7 @@ extern double mx_double_save, my_double_save; /*  20070322 */
 extern struct instentry *insttable[NBOXES][NBOXES];
 extern size_t get_tok_value_size;
 extern size_t get_tok_size;
-
+extern int batch_mode; /* no TCL console */
 /*  functions */
 extern void dbg(int level, char *fmt, ...);
 extern void here(void);

src/xschem.help

@@ -1,6 +1,7 @@
 usage: xschem [options] [schematic | symbol ]
 Options:
   -h  --help           Print this help.
+  -b  --batch          Detach Xschem from console.
   -n  --netlist        Do a netlist of the given schematic cell.
   -v  --version        Print version information and exit.
   -V  --vhdl           Set netlist type to VHDL.