NAME

explain_ptrace_or_die - process trace and report errors

SYNOPSIS

#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);

DESCRIPTION

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.

RETURN VALUE

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.

EXAMPLE

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);

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

EXAMPLE

SEE ALSO

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