On Tue, Feb 15, 2005 at 07:18:48AM -0800, Steve Iribarne wrote:
> 1. Does anyone know of a good library that I can build my app with that
> I can do a quick stack trace and dump those results somewhere.
Glibc include the backtrace*() family of functions, see "info libc".
Here's an excerpt:
- Function: int backtrace (void **BUFFER, int SIZE)
The `backtrace' function obtains a backtrace for the current
thread, as a list of pointers, and places the information into
BUFFER. The argument SIZE should be the number of `void *'
elements that will fit into BUFFER. The return value is the
actual number of entries of BUFFER that are obtained, and is at
most SIZE.
- Function: char ** backtrace_symbols (void *const *BUFFER, int SIZE)
The `backtrace_symbols' function translates the information
obtained from the `backtrace' function into an array of strings.
The argument BUFFER should be a pointer to an array of addresses
obtained via the `backtrace' function, and SIZE is the number of
entries in that array (the return value of `backtrace').
- Function: void backtrace_symbols_fd (void *const *BUFFER, int SIZE,
int FD)
The `backtrace_symbols_fd' function performs the same translation
as the function `backtrace_symbols' function. Instead of returning
the strings to the caller, it writes the strings to the file
descriptor FD, one per line. It does not use the `malloc'
function, and can therefore be used in situations where that
function might fail.
pstack(1) will print a stack backtrace of a running process.
Coretrace is a small backtrace program for core dumps,
http://www.arbetsmyra.dyndns.org/coretrace/
> 2. Can someone tell me how to make the coredump happen in a "known"
> good location.
My /etc/sysctl.conf looks like:
# Controls where core dumps are stored and how they are named.
# See linux/Documentation/sysctl/kernel.txt for details.
kernel.core_pattern = /extra_disk/core/%e:%t:%s:%h:%u:%g:%p
kernel.suid_dumpable = 2
The suid_dumpable sysctl is from a patch posted by Alan Cox to the lkml,
http://marc.theaimsgroup.com/?l=linux-kernel&m=109647550421014&w=2
-Bill
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