*** common/exf.c.orig	Mon Aug 15 14:01:57 1994
--- common/exf.c	Mon Aug 15 14:18:31 1994
***************
*** 601,606 ****
--- 601,620 ----
  		return (1);
  	}
  
+ #if __linux__
+ 	/*
+ 	 * In libc 4.5.x, fdopen(fd, "w") clears the O_APPEND flag (if set).
+ 	 * This bug is fixed in libc 4.6.x.
+ 	 *
+ 	 * This code works around this problem for libc 4.5.x users.
+ 	 * Note that this code is harmless if you're using libc 4.6.x.
+ 	 */
+ 	if (LF_ISSET(FS_APPEND) && lseek(fd, (off_t)0, SEEK_END) < 0) {
+ 		msgq(sp, M_SYSERR, name);
+ 		return (1);
+ 	}
+ #endif
+ 
  	/* Use stdio for buffering. */
  	if ((fp = fdopen(fd, "w")) == NULL) {
  		(void)close(fd);
*** PORT/db/recno/rec_open.c.orig	Mon Aug 15 14:02:13 1994
--- PORT/db/recno/rec_open.c	Mon Aug 15 14:16:57 1994
***************
*** 160,168 ****
--- 160,187 ----
  				SET(t, R_EOF);
  			else {
  				t->bt_msize = sb.st_size;
+ #if !__linux__
+ /*
+  * On Linux 1.1.35 and earlier, read only private mappings cause write only
+  * and read/write opens to fail with errno=ETXTBSY, so for those older
+  * versions of the kernel, this mmap() call should be commented out.
+  * This bug is fixed on 1.1.36 and later.
+  *
+  * Also, as of Linux 1.1.44, mmap() does not work together with the buffer
+  * cache.  The specific problem is changes made to a file via write() do
+  * not appear in memory mapped pages of that file, which causes confusing
+  * things to happen if you write out the file you're editing without
+  * quitting vi and try to GNU grep for the change you just wrote out.
+  * Since GNU grep uses mmap(), it grabs the memory mapped pages that vi is
+  * holding open due to this mmap() call, and ends up not seeing the change
+  * you wrote out because the memory mapped pages are out of date.
+  *
+  * So, until mmap() is fixed, we will avoid it here and use the slow method.
+  */
  				if ((t->bt_smap = mmap(NULL, t->bt_msize,
  				    PROT_READ, MAP_PRIVATE, rfd,
  				    (off_t)0)) == (caddr_t)-1)
+ #endif
  					goto slow;
  				t->bt_cmap = t->bt_smap;
  				t->bt_emap = t->bt_smap + sb.st_size;