Differences between version 3 and revision by previous author of CoreDump.
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| Newer page: | version 3 | Last edited on Sunday, March 7, 2004 3:54:52 pm | by JohnMcPherson | Revert |
| Older page: | version 2 | Last edited on Sunday, March 7, 2004 3:13:58 pm | by AristotlePagaltzis | Revert |
@@ -1,17 +1,15 @@
-Under [Unix] style [OperatingSystem]s
, when a program is terminated abnormaly
([SIGSEGV], [SIGABRT], etc.) and permissions allow (the current working directory
is writable, [
ulimit(1)]
s permit), the [Kernel] dumps
a copy of the program's address space, as well as the state of all the registers and any other state that's required to a file, usually called __
core__
or __
core.''programname''__.
-
-Programs such as gdb(1) can then parse these core files and give you some indication about ''why'' the program crashed
.
+Under [Unix] style operating systems
, when a program faults in some way
([SIGSEGV],[SIGABRT],etc..
.) and permissions allow (the [PWD]
is writable, ulimit(1)'
s permit), then
the kernel will write out
a copy of the program's address space, as well as the state of all the registers and any other state that's required to a file, usually called "
core"
or "
core.''programname''"
.
+Programs such as gdb(1) can then parse these core files and give you some indication about /why/ the program crashed.
strings core | grep ^_=
-
or
-
file core
-
will usually tell you what program caused the core file. You can then use
+ gdb ''program'' core
-
gdb ''program''
core
+gdb has several commands you can use to inspect the
core file, however the most useful of them is
+ (gdb) bt full
-gdb has several commands you can use to inspect the core file, however the most useful of them is __bt full__, which provides a "full backtrace". That is
usually enough information for
a programmer to
figure out why the program crashed.
+this will
usually display
enough information that
a programmer can
figure out why the program crashed. When emailing a bug report to a programmer about a program that crashed, including a full backtrace (as per the previous command) will greatly improve the chances that the programmer will be able to find and fix the bug you encountered
.
-Doing this when emailing a bug report about a program that crashed will greatly improve
the chances that the programmer will be able to find
and fix the bug you encountered
.
+See
the DeBugging page for more information
and hints about gdb
.
