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Man Pages
explain_ptrace_or_die(3) FreeBSD Library Functions Manual explain_ptrace_or_die(3)

explain_ptrace_or_die - process trace and report errors

#include <libexplain/ptrace.h>
long explain_ptrace_or_die(int request, pid_t pid, void *addr, void *data);
 
long explain_ptrace_on_error(int request, pid_t pid, void *addr, void *data);

The explain_ptrace_or_die function is used to call the ptrace(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_ptrace(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_ptrace_on_error function is used to call the ptrace(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_ptrace(3) function, but still returns to the caller.
request
The request, exactly as to be passed to the ptrace(2) system call.
pid
The pid, exactly as to be passed to the ptrace(2) system call.
addr
The addr, exactly as to be passed to the ptrace(2) system call.
data
The data, exactly as to be passed to the ptrace(2) system call.

The explain_ptrace_or_die function only returns on success, see ptrace(2) for more information. On failure, prints an explanation and exits, it does not return.
The explain_ptrace_on_error function always returns the value return by the wrapped ptrace(2) system call.

The explain_ptrace_or_die function is intended to be used in a fashion similar to the following example:
long result = explain_ptrace_or_die(request, pid, addr, data);

ptrace(2)
process trace
explain_ptrace(3)
explain ptrace(2) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2010 Peter Miller

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