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.\" Copyright (c) 2011 Kai Wang
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $Id: dwarf_get_cie_info.3 2071 2011-10-27 03:20:00Z jkoshy $
.\"
.Dd May 29, 2011
.Os
.Dt DWARF_GET_CIE_INFO 3
.Sh NAME
.Nm dwarf_get_cie_info
.Nd retrieve information associated with a CIE descriptor
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_get_cie_info
.Fa "Dwarf_Cie cie"
.Fa "Dwarf_Unsigned *cie_byte_len"
.Fa "Dwarf_Small *version"
.Fa "char **augmentation"
.Fa "Dwarf_Unsigned *caf"
.Fa "Dwarf_Unsigned *daf"
.Fa "Dwarf_Half *ra"
.Fa "Dwarf_Ptr *init_inst"
.Fa "Dwarf_Unsigned *inst_len"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_get_cie_info
retrieves the information associated with a given CIE descriptor.
.Pp
Argument
.Ar cie
should reference a valid DWARF CIE descriptor, such as would be
returned by function
.Xr dwarf_get_cie_of_fde 3 .
.Pp
Argument
.Ar cie_byte_len
should point to a location that will hold the length in bytes of
the CIE descriptor itself.
.Pp
Argument
.Ar version
should point to a location that will hold the version number of
the CIE descriptor.
.Pp
Arugment
.Ar augmentation
should point to a location that will be set to a pointer to a
NUL-terminated string containing augmentation data encoded as UTF-8.
.Pp
Argument
.Ar caf
should point to a location that will hold the code alignment
factor recorded in the CIE descriptor.
.Pp
Arugment
.Ar daf
should point to a location that will hold the data alignment
factor recorded in the CIE descriptor.
.Pp
Argument
.Ar ra
should point to a location that will hold the return address
recorded in the CIE descriptor.
.Pp
Argument
.Ar init_inst
should point to a location that will be set to a pointer to an array
of bytes containing the initial instructions associated with the CIE
descriptor.
.Pp
Argument
.Ar inst_len
should point to a location that will hold the length in bytes
of the initial instructions returned in argument
.Ar init_inst .
.Pp
If argument
.Ar err
is not NULL, it will be used to store error information in case of an
error.
.Sh RETURN VALUES
Function
.Fn dwarf_get_cie_info
returns
.Dv DW_DLV_OK
when it succeeds.
In case of an error, it returns
.Dv DW_DLV_ERROR
and sets the argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_get_cie_info
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
One of the arguments
.Ar cie ,
.Ar cie_byte_len ,
.Ar version ,
.Ar augmentation ,
.Ar caf ,
.Ar daf ,
.Ar ra ,
.Ar init_inst
or
.Ar inst_len
was NULL.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_get_cie_index 3 ,
.Xr dwarf_get_cie_of_fde 3 ,
.Xr dwarf_get_fde_at_pc 3 ,
.Xr dwarf_get_fde_info_for_all_regs 3 ,
.Xr dwarf_get_fde_info_for_all_regs3 3 ,
.Xr dwarf_get_fde_info_for_cfa_reg3 3 ,
.Xr dwarf_get_fde_info_for_reg 3 ,
.Xr dwarf_get_fde_info_for_reg3 3 ,
.Xr dwarf_get_fde_instr_bytes 3 ,
.Xr dwarf_get_fde_list 3 ,
.Xr dwarf_get_fde_list_eh 3 ,
.Xr dwarf_get_fde_n 3 ,
.Xr dwarf_get_fde_range 3
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