http://www.berklix.com/~jhs/src/bsd/fixes/FreeBSD/ports/gen/print/ghostview/files/patch-ja.REL=ALL.cust_rel

document redisplay on signal hook for wysiwyg

*** ghostview.man.orig	Sat Jul 24 04:29:12 1993
--- ghostview.man	Fri Dec  9 05:36:56 1994
***************
*** 44,49 ****
--- 44,50 ----
  [\-folio] [\-quarto] [\-10x14]
  [\-force] [\-forceorientation] [\-forcemedia]
  [\-[no]openwindows] [\-[no]ncdwm]
+ [\-[no]reopen_sig] [\-[no]pid_report]
  [\-page \fIlabel\fP] [\-\fItoolkitoption\fR\ ...]
  [filename]
  .SH DESCRIPTION
***************
*** 555,560 ****
--- 556,577 ----
  fix-10.
  You should only set this resource if you have the problem.
  The default value is ``false''.
+ .IP "\fBpid_report (\fPclass\fB PidReport)\fP" 1i
+ .\" added by Julian H. Stacey <jhs@
+ Prints the process number on startup. 
+ Usually used with \fBreopen_sig\fP.
+ The default value is ``false''.
+ .IP "\fBreopen_sig (\fPclass\fB ReopenSig)\fP" 1i
+ Accept SIGUSR1 as a signal requesting reopen (& thus redisplay). 
+ Usually used with \fBpid_report\fP.
+ The default value is ``false''.
+ .br
+ These hooks \fBpid_report\fP & \fBreopen_sig\fP
+ were added to work with \fBvi -C\fP.
+ All three together when used correctly, allow for example:
+ a vi edit xterm of a groff source to be run
+ alonside a ghostview display, so that every time the vi file is written,
+ the postscript file is regenerated, & redisplayed automatically.
  .SH GHOSTVIEW WIDGET RESOURCES
  Certain resources in the Ghostview widget may be set by the user.
  These selected resources are presented below.
*** main.c.orig	Sat Jul 24 04:29:12 1993
--- main.c	Sat Dec 10 12:04:40 1994
***************
*** 53,58 ****
--- 53,60 ----
  #include "gv.h"
  #include "ps.h"
  
+ #include <signal.h>
+ 
  extern char *getenv();
  
  static String version = "Ghostview, version 1.5";
***************
*** 129,134 ****
--- 131,140 ----
       XtOffsetOf(AppResources, openwindows), XtRImmediate, (XtPointer)False},
      {"ncdwm", "Ncdwm", XtRBoolean, sizeof(Boolean),
       XtOffsetOf(AppResources, ncdwm), XtRImmediate, (XtPointer)False},
+     {"reopenSig", "ReopenSig", XtRBoolean, sizeof(Boolean),
+      XtOffsetOf(AppResources, reopen_sig), XtRImmediate, (XtPointer)False},
+     {"pidReport", "PidReport", XtRBoolean, sizeof(Boolean),
+      XtOffsetOf(AppResources, pid_report), XtRImmediate, (XtPointer)False},
  };
  
  static XrmOptionDescRec options[] = {
***************
*** 183,188 ****
--- 189,198 ----
      {"-noopenwindows", ".openWindows", XrmoptionNoArg, "False"},
      {"-ncdwm", ".ncdwm", XrmoptionNoArg, "True"},
      {"-noncdwm", ".ncdwm", XrmoptionNoArg, "False"},
+     {"-reopen_sig", ".reopenSig", XrmoptionNoArg, "True"},
+     {"-noreopen_sig", ".reopenSig", XrmoptionNoArg, "False"},
+     {"-pid_report", ".pidReport", XrmoptionNoArg, "True"},
+     {"-nopid_report", ".pidReport", XrmoptionNoArg, "False"},
  };
  
  static XtActionsRec actions[] = {
***************
*** 411,416 ****
--- 421,433 ----
  
      XtGetApplicationResources(toplevel, (XtPointer) &app_res,
  			      resources, XtNumber(resources), NULL, ZERO);
+ 
+     /* Ignore any unexpectedly early SIGUSR1, though as we've not reported
+      * our process id yet, it'll be hard for someone to find, except with
+      * ps(1).
+      */
+     if (app_res.reopen_sig) signal(SIGUSR1,SIG_IGN); 
+ 
      if (s1 = getenv(app_res.printer_variable)) app_res.default_printer = s1;
  
      /* Open Windows sometimes hands me a bad bitmap */
***************
*** 879,884 ****
--- 896,926 ----
      layout_ghostview();
      XtMapWidget(toplevel);
  
+     if (app_res.reopen_sig) 
+ 	{
+ 	signal(SIGUSR1,gv_reopen); 
+ 	/* Set signal handling  before printing process number, so no one
+ 	 * can send a an unexpectd SIGUSR1 that would kill us.
+ 	 * I put off accepting first signal while ghostview is presumably
+ 	 * initialising stuff that maybe needed for the resize function
+ 	 * (that I never wrote, merely grabbed shared use of).
+ 	 # I also presume there's not much advantage to accepting
+ 	 * a SIGUSR1 reopen till now.
+ 	 */
+ 	}
+     if (app_res.pid_report) 
+ 	{
+ 	printf("%d\n",(int)(getpid())); 
+ 	/* Before I added the flush, when I called this from a makefile,
+ 	 * the pid was only printed after 
+ 	 * I selected the file+exit buttons, much too late to be useful 
+ 	 * ghostview had been sitting idle for some time, &
+ 	 * I had wanted to send a SIGUSR1, but could not, cos didnt know
+ 	 * process number.
+ 	 */
+ 	fflush(stdout);
+ 	}
+ 
      show_page(i);
      XtAppMainLoop(app_con);
  
***************
*** 916,921 ****
--- 955,962 ----
  		"    [-force] [-forceorientation] [-forcemedia]\n");
      fprintf(stderr,
  		"    [-[no]openwindows] [-[no]ncdwm]\n");
+     fprintf(stderr,
+ 		"    [-[no]reopen_sig] [-[no]pid_report]\n");
      fprintf(stderr,
  		"    [-page <label>] [toolkitoption]\n");
      fprintf(stderr,
*** gv.h.orig	Sat Jul 24 04:29:12 1993
--- gv.h	Fri Dec  9 04:51:01 1994
***************
*** 42,47 ****
--- 42,49 ----
      Boolean show_date;		/* whether to show date */
      Boolean show_locator;	/* whether to show locator */
      Boolean auto_center;	/* whether to automatically center the page */
+     Boolean reopen_sig;		/* whether to reopen on signal */
+     Boolean pid_report;		/* whether to print pid */
      int wm_horiz_margin;	/* Space taken by window manager */
      int wm_vert_margin;		/* Space taken by window manager */
      int minimum_magstep;	/* smallest magstep allowed */