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Document the new PT_LWPINFO request. In fact, the request is so new

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it hasn't even been implemented yet. I just wanted to be the first
to try a new approach to development ;-)
This commit is contained in:
Marcel Moolenaar 2004-07-12 04:43:58 +00:00
parent eba90ac75f
commit b41e0f0f56
1 changed files with 19 additions and 0 deletions
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19
lib/libc/sys/ptrace.2
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@ -278,6 +278,25 @@ it loads the traced process's debug registers from the
.In machine/reg.h )
pointed to by
.Fa addr .
.It Dv PT_LWPINFO
This request can be used to obtain information about the kernel thread,
also known as light-weight process, that caused the traced process to stop.
The
.Fa addr
argument specifies a pointer to a
.Vt "struct ptrace_lwpinfo" ,
which is defined as follows:
.Bd -literal
struct ptrace_lwpinfo {
lwpid_t pl_lwpid; /* LWP described. */
int pl_event; /* Event received. */
};
.Ed
.Pp
The
.Fa data
argument is to be set to the size of the structure known to the caller.
This allows the structure to grow without affecting older programs.
.El
.Pp
Additionally, machine-specific requests can exist.