MACH-CMD(3) MACH-CMD(3)
NAME
attachargs, attachcore, attachdynamic, attachproc,
proctextfile - debugging processes and core files
SYNOPSIS
#include <u.h>
#include <libc.h>
#include <mach.h>
int attachcore(Fhdr *hdr)
int attachproc(int pid)
int attachdynamic(void)
char* proctextfile(int pid)
int attachargs(int argc, char **argv, int omode)
extern Fhdr* symhdr;
extern char* symfil;
extern Map* symmap;
extern Fhdr* fhdrlist;
extern Fhdr* corhdr;
extern char* corfil;
extern Map* cormap;
extern int corpid;
extern Regs* correg;
DESCRIPTION
These routines provide access to the objects a typical
debugger manipulates: an executable binary, some number of
shared libraries, a memory image in the form of a core dump
or active process, and a register set.
The maintained state is:
symhdr
The file header for the main binary.
symfil
The file name of the main binary.
symmap
The memory map of the main binary.
fhdrlist
A linked list (via the Fhdr.next fields) of all
Page 1 Plan 9 (printed 12/22/24)
MACH-CMD(3) MACH-CMD(3)
currently open headers (see symopen in mach-symbol(3)).
When dynamically linked objects have been attached,
they are present in this linked list, and therefore
included in searches by indexsym, lookupsym, and
findsym (see mach-symbol(3)).
corhdr
The file header for the core dump, if any.
corfil
The file name of the core dump, if any.
cormap
The memory map of the core dump or attached process.
corpid
The process id of the attached process, if any.
correg
The register set of the core dump or attached process.
If these fields are not valid, they are zeroed.
Attachcore and attachproc attach to an opened core file or
an executing process. They set corhdr, corfil, cormap,
corpid, and correg.
Proctextfile returns the name of the main binary for the
process with id pid.
Attachdynamic requires that the memory image already be
attached. It reads the dynamic linker's internal run-time
data structures and then opens all the dynamic objects that
are currently loaded.
Attachargs uses all of these functions while parsing an
argument vector as would be passed to a debugger like db(1)
or acid(1). It expects a list of executable files, core dump
files, or process ids, given in any order. If extra argu-
ments are given (for example, more than one executable, or
both a core dump and a process id), they are ignored and
diagnostics are printed to standard error. If arguments are
missing (for example, the process id is given without an
executable file), attachargs fills them in as best it can.
SOURCE
/usr/local/plan9/src/libmach
SEE ALSO
mach(3), mach-file(3), mach-map(3)
BUGS
The interface needs to be changed to support multiple
Page 2 Plan 9 (printed 12/22/24)
MACH-CMD(3) MACH-CMD(3)
threads, each with its own register set.
Page 3 Plan 9 (printed 12/22/24)