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authorUlrich Drepper <drepper@redhat.com>1998-03-18 17:57:13 +0000
committerUlrich Drepper <drepper@redhat.com>1998-03-18 17:57:13 +0000
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Update.
1998-03-18 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/memory.texi (Heap Consistency Checking): Document MALLOC_CHECK_. Based on a text by Wolfram Gloger. 1998-03-18 17:11 Zack Weinberg <zack@rabi.phys.columbia.edu> * manual/Makefile: Add missing rules. 1998-03-18 Ulrich Drepper <drepper@cygnus.com> * timezone/Makefile (generated): Define to remove all stamp files. * sysdeps/generic/strsep.c: Also undefine __strsep. * string/strdup.c: Undefine __strdup and strdup first. * string/strndup.c: Likewise. * string/bits/string2.h: Correct strtok_r and strsep. Add strndup optimization. * sysdeps/generic/strsep.c: Little optimization.
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@@ -611,6 +611,20 @@ The block was already freed.
@end table
@end deftp
+Another possibility to check for and guard against bugs in the use of
+@code{malloc}, @code{realloc} and @code{free} is to set the environment
+variable @code{MALLOC_CHECK_}. When @code{MALLOC_CHECK_} is set, a
+special (less efficient) implementation is used which is designed to be
+tolerant against simple errors, such as double calls of @code{free} with
+the same argument, or overruns of a single byte (off-by-one bugs). Not
+all such errors can be proteced against, however, and memory leaks can
+result. If @code{MALLOC_CHECK_} is set to @code{0}, any detected heap
+corruption is silently ignored; if set to @code{1}, a diagnostic is
+printed on @code{stderr}; if set to @code{2}, @code{abort} is called
+immediately. This can be useful because otherwise a crash may happen
+much later, and the true cause for the problem is then very hard to
+track down.
+
@node Hooks for Malloc
@subsection Storage Allocation Hooks
@cindex allocation hooks, for @code{malloc}