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Full Discussion: Search the symbol table of a child process
Top Forums Programming Search the symbol table of a child process Post 303034389 by Corona688 on Wednesday 24th of April 2019 11:21:24 AM
Old 04-24-2019
Quote:
Originally Posted by alphakili
Now, I simply do not get: How does that give me access to the symbols of the execve process?
It doesn't. The child is supposed to print its own symbols.

Either that, or you go whole-hog and attach a debugger. Probably much easier to use gdb than build it yourself.
This User Gave Thanks to Corona688 For This Post:
alphakili
 

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LEARN ABOUT NETBSD

dbsym

DBSYM(8)						    BSD System Manager's Manual 						  DBSYM(8)

NAME

     dbsym -- copy kernel symbol table into db_symtab space

SYNOPSIS

     dbsym [-v] [-b bfdname] kernel

DESCRIPTION

     dbsym is used to copy the symbol table in a newly linked kernel into the db_symtab array (in the data section) so that the ddb(4) kernel
     debugger can find the symbols.  This program is only used on systems for which the boot program does not load the symbol table into memory
     with the kernel.  The space for these symbols is reserved in the data segment using a config option like:

     options	    SYMTAB_SPACE=72000

     The size of the db_symtab array (the value of SYMTAB_SPACE) must be at least as large as the kernel symbol table.	If insufficient space is
     reserved, dbsym will refuse to copy the symbol table.

     To recognize kernel executable format, the -b flag specifies BFD name of kernel.

     If the -v flag is given, dbsym will print out status information as it is copying the symbol table.

     Note that debugging symbols are not useful to the ddb(4) kernel debugger, so to minimize the size of the kernel, one should either compile
     the kernel without debugging symbols (no -g flag) or use the strip(1) command to strip debugging symbols from the kernel before dbsym is used
     to copy the symbol table.	The command

     strip -d netbsd

     will strip out debugging symbols.

SEE ALSO

     strip(1), ddb(4)

BSD
								 November 9, 2001							       BSD
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