usr/src/man/man3proc/Paddr_to_map.3proc

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.Dd May 11, 2016
.Dt PADDR_TO_MAP 3PROC
.Os
.Sh NAME
.Nm Paddr_to_map ,
.Nm Paddr_to_text_map ,
.Nm Plmid_to_map ,
.Nm Pname_to_map
.Nd lookup memory map information
.Sh LIBRARY
.Lb libproc
.Sh SYNOPSIS
.In libproc.h
.Ft "const prmap_t *"
.Fo Paddr_to_map
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fc
.Ft "const prmap_t *"
.Fo Paddr_to_text_map
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fc
.Ft "const prmap_t *"
.Fo Plmid_to_map
.Fa "struct ps_prochandle *P"
.Fa "Lmid_t lmid"
.Fa "const char *name"
.Fc
.Ft "const prmap_t *"
.Fo Pname_to_map
.Fa "struct ps_prochandle *P"
.Fa "const char *name"
.Fc
.Sh DESCRIPTION
The
.Fn Paddr_to_map ,
.Fn Paddr_to_text_map ,
.Fn Plmid_to_map ,
and
.Fn Pname_to_map
functions lookup memory map information in the process handle
.Fa P .
The
.Sy prmap_t
structure provides information such as the size, offset, and object of
the mapping and is defined in
.Xr proc 4 .
.Pp
The pointer to the data returned by the library will only be valid for
as long as the handle
.Fa P
is valid.
Any calls to
.Xr Prelease 3PROC
will invalidate the data.
.Pp
The
.Fn Paddr_to_map
function attempts to find the mapping information corresponding to the
address
.Fa addr .
.Pp
The
.Fn Paddr_to_text_map
function is similar to the
.Fn Paddr_to_map
function; however, it only returns successfully if the specified address
corresponds to a text mapping as identified by the run-time link-editor.
One use of this is to ensure that a mapping is actually a text-mapping
before inserting a breakpoint in it.
.Pp
The
.Fn Pname_to_map
function looks up the object named
.Fa name
and returns the corresponding mapping information.
Two special values may be used for name.
The macro
.Dv PR_OBJ_EXEC
refers to the executable object itself and the macro
.Dv PR_OBJ_LDSO refers to the object ld.so.1 .
.Pp
The
.Fn Plmid_to_map
function is similar to
.Fn Pname_to_map .
It allows passing a link-map identifier,
.Fa lmid ,
which constricts the search of the object named with
.Fa name
to that link-map.
The special value of
.Dv PR_LMID_EVERY
may be passed to indicate that every link-map should be searched, which
is equivalent in behavior to the
.Fn Pname_to_map
function.
.Sh RETURN VALUES
Upon successful completion, the
.Fn Paddr_to_map ,
.Fn Paddr_to_text_map ,
.Fn Plmid_to_map ,
and
.Fn Pname_to_map
functions return a pointer to the corresponding mapping information.
If none exists then
.Dv NULL
is returned.
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
See
.Sy LOCKING
in
.Xr libproc 3LIB .
.Sh SEE ALSO
.Xr libproc 3LIB ,
.Xr Prelease 3PROC ,
.Xr proc 4