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

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.Dd May 11, 2016
.Dt PLOOKUP_BY_ADDR 3PROC
.Os
.Sh NAME
.Nm Plookup_by_addr ,
.Nm Pxlookup_by_addr ,
.Nm Pxlookup_by_addr_resolved ,
.Nm Plookup_by_name ,
.Nm Pxlookup_by_name
.Nd lookup symbols in a process
.Sh SYNOPSIS
.Lb libproc
.In libproc.h
.Ft int
.Fo Plookup_by_addr
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fa "char *buf"
.Fa "size_t size"
.Fa "Gelf_Sym *symp"
.Fc
.Ft int
.Fo Pxlookup_by_addr
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fa "char *buf"
.Fa "size_t size"
.Fa "Gelf_Sym *symp"
.Fa "prsyminfo_t *sip"
.Fc
.Ft int
.Fo Pxlookup_by_addr_resolved
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fa "char *buf"
.Fa "size_t size"
.Fa "Gelf_Sym *symp"
.Fa "prsyminfo_t *sip"
.Fc
.Ft int
.Fo Plookup_by_name
.Fa "struct ps_prochandle *P"
.Fa "const char *object"
.Fa "const char *symbol"
.Fa "GElf_Sym *symp"
.Fc
.Ft int
.Fo Pxlookup_by_name
.Fa "struct ps_prochandle *P"
.Fa "Lmid_t lmid"
.Fa "const char *object"
.Fa "const char *symbol"
.Fa "GElf_Sym *symp"
.Fa "prsyminfo_t *sip"
.Fc
.Sh DESCRIPTION
The
.Fn Plookup_by_addr ,
.Fn Pxlookup_by_addr ,
.Fn Pxlookup_by_addr_resolved ,
.Fn Plookup_by_name ,
and
.Fn Pxlookup_by_name
functions look up symbol information in the process handle
.Fa P
and fill in the ELF symbol information in
.Fa symp
with the found symbol.
Symbols may be looked up both by address and name.
.Pp
The
.Fn Plookup_by_addr
function looks up symbol information corresponding to the address
.Fa addr .
If found, up to
.Fa size
bytes of the symbol's name, including the null terminator will be filled
in to the buffer
.Fa buf .
.Pp
The
.Fn Pxlookup_by_addr
function is identical to the
.Fn Plookup_by_addr
function, except that it also fills in the structure
.Fa sip
with additional information.
The definition of the
.Sy prsyminfo_t
is found in
.Xr libproc 3LIB .
.Pp
The
.Fn Pxlookup_by_addr_resolved
function is similar to the
.Fn Pxlookup_by_addr
function; however, it attempts to resolve the paths present in the
.Sy prsyminfo_t
to an absolute path on the file system.
.Pp
The
.Fn Plookup_by_name
function attempts to look up a symbol based on its name.
The
.Fa object
argument allows the caller to specify a specific object that was mapped
in by the run-time link-editor to search for
.Fa symbol
in.
The system provides three special values which may be passed in for
.Fa object .
The value
.Dv PR_OBJ_EXEC
refers to the executable's object (a.out).
The value
.Dv PR_OBJ_LDSO
refers to the object
.Sy ld.so.1 .
The value
.Dv PR_OBJ_EVERY
indicates that every object should be searched.
.Pp
The
.Fn Pxlookup_by_name
function is similar to the
.Fn Plookup_by_name
function; however, it allows a link-map identifier,
.Fa lmid ,
to be specified and also provides additional information about the
symbol in the form of the
.Sy prsyminfo_t
.Fa sip .
The specification of
.Fa lmid
restricts the search for the object named
.Fa object
and symbol named
.Fa symbol
to the specified link-map.
.Pp
There are three special link-map identifiers that may be passed in.
The symbol
.Dv PR_LMID_EVERY
indicates that every link-map should be searched.
The symbol
.Dv LM_ID_BASE
indicates that the base link-map, the one that is used for the
executable should be searched.
Finally, the symbol
.Dv LM_ID_LDSO
refers to the link-map that is used by the run-time link editor, ld.so.1.
The
.Fn Plookup_by_name
function behaves like
.Fn Pxlookup_by_name
when the
.Dv PR_LMID_EVERY
argument is passed to
.Fa lmid ,
indicating that every link-map should be searched.
.Sh RETURN VALUES
Upon successful completion, the
.Fn Plookup_by_addr ,
.Fn Pxlookup_by_addr ,
.Fn Pxlookup_by_addr_resolved ,
.Fn Plookup_by_name ,
and
.Fn Pxlookup_by_name
functions return
.Sy 0
and fill in the symbol information.
Otherwise,
.Sy -1
is returned to indicate that the symbol could not be found.
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
See
.Sy LOCKING
in
.Xr libproc 3LIB .
.Sh SEE ALSO
.Xr elf 3ELF ,
.Xr gelf 3ELF ,
.Xr libproc 3LIB ,
.Xr proc 4