Thanks! -> -----Original Message----- -> From: Bill Rugolsky Jr. [mailto:brugolsky@xxxxxxxxxxxxxxxxxxxxxxxxx] -> Sent: Tuesday, February 15, 2005 7:51 AM -> To: Steve Iribarne -> Cc: kernel newbies -> Subject: Re: Core dump question -> -> 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 -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
