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write_child

Syntax

 
#include <debug/dbgcom.h>

void write_child (unsigned child_addr, void *buf, unsigned len);

Description

This function transfers len bytes from the buffer pointed to by buf in the debugger's data segment to the memory of the debugged process starting at the address child_addr. It is used primarily to insert a breakpoint instruction into the debugged process (to trigger a trap when the debuggee's code gets to that point). The companion function read_child (see section read_child) is usually called before write_child to save the original code overwritten by the breakpoint instruction.

Return Value

The function return zero if it has successfully transferred the data, non-zero otherwise (e.g., if the address in child_addr is outside the limits of the debuggee's code segment.

Portability

ANSI/ISO C No
POSIX No


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  Copyright 2004   by DJ Delorie     Updated Apr 2004