--- ray/src/util/rpiece.c	1993/01/21 17:46:31	2.15
+++ ray/src/util/rpiece.c	1993/04/16 12:03:59	2.18
@@ -10,6 +10,19 @@ static char SCCSid[] = "$SunId$ LBL";
  
 #include "standard.h"
 #include <fcntl.h>
+
+#ifndef F_SETLKW
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+	fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
+	exit(1);
+}
+
+#else
+
 #include <signal.h>
 #include "color.h"
 #include "view.h"
@@ -26,7 +39,15 @@ static char SCCSid[] = "$SunId$ LBL";
 #define  MAXFORK		0
 #endif
 #endif
-
+					/* protection from SYSV signals(!) */
+#if defined(sgi) || defined(hpux)
+#define guard_io()	sighold(SIGALRM)
+#define unguard()	sigrelse(SIGALRM)
+#endif
+#ifndef guard_io
+#define guard_io()	0
+#define unguard()	0
+#endif
 				/* rpict command */
 char  *rpargv[128] = {"rpict", "-S", "1", "-x", "512", "-y", "512", "-pa", "1"};
 int  rpargc = 9;
@@ -245,7 +266,7 @@ int  *xp, *yp;
 				return(0);
 			}
 		}
-		sprintf(buf, "%d %d\n%d %d\n", hmult, vmult, *xp, *yp);
+		sprintf(buf, "%4d %4d\n%4d %4d\n", hmult, vmult, *xp, *yp);
 		lseek(syncfd, 0L, 0);		/* write new position */
 		write(syncfd, buf, strlen(buf));
 		fls.l_type = F_UNLCK;		/* release sync file */
@@ -338,19 +359,24 @@ int  xpos, ypos;
 		exit(cleanup(1));
 	}
 				/* check header from rpict */
+	guard_io();
 	getheader(fromrp, NULL, NULL);
 	if (!fscnresolu(&hr, &vr, fromrp) || hr != hres | vr != vres) {
 		fprintf(stderr, "%s: resolution mismatch from %s\n",
 				progname, rpargv[0]);
 		exit(cleanup(1));
 	}
+	unguard();
 				/* load new piece into buffer */
-	for (y = 0; y < vr; y++)
+	for (y = 0; y < vr; y++) {
+		guard_io();
 		if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
 			fprintf(stderr, "%s: read error from %s\n",
 					progname, rpargv[0]);
 			exit(cleanup(1));
 		}
+		unguard();
+	}
 #if MAXFORK
 				/* fork so we don't slow rpict down */
 	if ((pid = fork()) > 0) {
@@ -405,3 +431,5 @@ writerr:
 	fprintf(stderr, "%s: write error on file \"%s\"\n", progname, outfile);
 	_exit(1);
 }
+
+#endif