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 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 arguments 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
/src/libmach

SEE ALSO
mach((3)), mach-file((3)), mach-map((3))

BUGS
The interface needs to be changed to support multiple threads, each with its own register set.