Added more detail on exit handlers.

Minor wording fixes.

man3/exit.3

@@ -20,7 +20,7 @@
 .\" Formatted or processed versions of this manual, if unaccompanied by
 .\" the source, must acknowledge the copyright and authors of this work.
 .\"
-.TH EXIT 3  2001-11-17 "" "Linux Programmer's Manual"
+.TH EXIT 3  2007-06-12 "Linux" "Linux Programmer's Manual"
 .SH NAME
 exit \- cause normal process termination
 .SH SYNOPSIS
@@ -50,8 +50,23 @@ to register an additional
 function to be executed during exit processing;
 the new registration is added to the front of the list of functions
 that remain to be called.)
+If one of these functions does not return
+(e.g., it calls
+.BR _exit (2),
+or kills itself with a signal),
+then none of the remaining functions is called,
+and further exit processing (in particular, flushing of
+.BR stdio (3)
+streams) is abandoned.
+If a function has been registered multiple times using
+.BR atexit (3)
+or
+.BR on_exit (3),
+then it is called as many times as it was registered.
 .LP
-All open streams are flushed and closed.
+All open
+.BR stdio (3)
+streams are flushed and closed.
 Files created by
 .BR tmpfile (3)
 are removed.
@@ -81,7 +96,7 @@ or
 .BR longjmp (3).
 .LP
 The use of EXIT_SUCCESS and EXIT_FAILURE is slightly more portable
-(to non-Unix environments) than that of 0 and some non-zero value
+(to non-Unix environments) than the use of 0 and some non-zero value
 like 1 or \-1.
 In particular, VMS uses a different convention.
 .LP