HP-UX Reference (11i v1 05/09) - 2 System Calls (vol 5)

ptrace(2) ptrace(2)

main()

{

event_len = sizeof(ptrace_event_t);

state_len = sizeof(ptrace_state_t);

event_addr = calloc(event_len, 1);

state_addr = calloc(state_len, 1);

buf_addr = calloc(MAXPATH, 1);

pipe(filed);

switch (pid = fork()) {

case -1:

exit(1);

case 0:

child();

break;

default:

parent();

break;

}

ERRORS

If ptrace() fails, errno is set to one of the following values.

[EACCES] The executable image of the process being attached resides across an interruptible

NFS mount.

[EIO] request is an illegal number.

[EIO] The PT_SETTRC request is used with a data argument that is less than zero or not a

multiple of four, or data is not word-aligned.

[EIO] Attempting to write to a memory segment of the traced process that is not writable,

or attempting to write to page 0, or the request argument is out of range.

[EIO] The PT_CONTIN request is being used with an invalid data argument (signal

number).

[EIO] Attempting to write to the user area via the PT_WUAREA request.

[EPERM] The speciﬁed process cannot be attached for tracing.

[EPERM] The process pid is already being traced or pid refers to the calling process itself.

[ESRCH] pid identiﬁes a process to be traced that does not exist or has not executed a

ptrace() with request PT_SETTRC .