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.Dd May 11, 2016
.Dt PROC_ARG_PSINFO 3PROC
.Os
.Sh NAME
.Nm proc_arg_psinfo ,
.Nm proc_arg_xpsinfo
.Nd process ps information utility function
.Sh SYNOPSIS
.Lb libproc
.In libproc.h
.Ft pid_t
.Fo proc_arg_psinfo
.Fa "const char *arg"
.Fa "int oflag"
.Fa "psinfo_t *psp"
.Fa "int *perr"
.Fc
.Ft pid_t
.Fo proc_arg_xpsinfo
.Fa "const char *arg"
.Fa "int oflag"
.Fa "psinfo_t *psp"
.Fa "int *perr"
.Fa "const char **lwps"
.Fc
.Sh DESCRIPTION
The
.Fn proc_arg_psinfo
and
.Fn proc_arg_xpsinfo
functions are utility functions which process an argument that may
refer to a currently active process or core file and attempts to obtain the
.Xr ps 1
information from the process or core and fills it into
.Fa psp .
.Pp
The string
.Fa arg
contains the name of something to try and open. How it is interpreted
depends on the value of
.Fa oflag .
The following values may be passed in as a bitwise-exclusive-OR for
.Fa oflag :
.Bl -tag -width Dv -offset indent
.It Dv PR_ARG_PIDS
Allows
.Fa arg
to specify process IDs and /proc arguments.
.It Dv PR_ARG_CORES
Allows
.Fa arg
to specify core files.
.It PR_ARG_ANY
Encompasses all of the previous opens.
.El
.Pp
The argument
.Fa perr
must be a
.Pf non- Dv NULL
pointer and in the event that the
.Fn proc_arg_psinfo
or
.Fn proc_arg_xpsinfo
functions fail, then
.Fa perr
will be updated with a more detailed error number.
.Pp
If the
.Fa lwps
argument is
.Pf non- Dv NULL ,
then if there is a thread specification present in
.Fa arg ,
it will be validated to see if it is a valid range and then a pointer to
the start of the thread specification will be stored in
.Fa lwps .
For more information on determining process range validity, see
.Xr proc_lwp_range_valid 3PROC
for more information on valid and invalid tread specifications.
.Sh RETURN VALUES
Upon successful completion, the
.Fn proc_arg_psinfo
and
.Fn proc_arg_xpsinfo
functions return the process identifier and fill in
.Fa psp
with the ps information of the process. Otherwise,
.Sy -1
is returned and
.Fa perr
is filled in with the error's details.
.Sh ERRORS
For a full list of additional errors, see the
.Sy ERRORS
section in
.Xr Pgrab_core 3PROC .
.Bl -tag -width Er
.It Er G_BADLWPS
.Fa arg
contains an invalid thread specification.
.It Er G_NOCORE
.Dv PR_ARG_CORES
was set and no core file could be found corresponding to
.Fa arg .
.It Er G_NOPROC
.Dv PR_ARG_PIDS
was set and no process could be found corresponding to
.Fa arg .
.It Er G_NOPROCORCORE
Both
.Dv PR_ARG_CORES
and
.Dv PR_ARG_NOPROC
were set and no process or core file could be found corresponding to
.Fa arg .
.El
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
.Sy MT-Safe
.Sh SEE ALSO
.Xr ps 1 ,
.Xr libproc 3LIB ,
.Xr Pgrab 3PROC ,
.Xr Pgrab_core 3PROC ,
.Xr Prelease 3PROC ,
.Xr proc_lwp_range_valid 3PROC ,
.Xr proc 4