119 lines
3.1 KiB
Groff
119 lines
3.1 KiB
Groff
.\" Copyright (c) 2006,2008 Joseph Koshy. 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 Joseph Koshy ``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 Joseph Koshy 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: elf_rand.3 189 2008-07-20 10:38:08Z jkoshy $
|
|
.\"
|
|
.Dd June 17, 2006
|
|
.Os
|
|
.Dt ELF_RAND 3
|
|
.Sh NAME
|
|
.Nm elf_rand
|
|
.Nd provide sequential access to the next archive member
|
|
.Sh LIBRARY
|
|
.Lb libelf
|
|
.Sh SYNOPSIS
|
|
.In libelf.h
|
|
.Ft off_t
|
|
.Fn elf_rand "Elf *archive" "off_t offset"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn elf_rand
|
|
function causes the ELF descriptor
|
|
.Ar archive
|
|
to be adjusted so that the next call to
|
|
.Xr elf_begin 3
|
|
will provide access to the archive member at byte offset
|
|
.Ar offset
|
|
in the archive.
|
|
Argument
|
|
.Ar offset
|
|
is the byte offset from the start of the archive to the beginning of
|
|
the archive header for the desired member.
|
|
.Pp
|
|
Archive member offsets may be retrieved using the
|
|
.Xr elf_getarsym 3
|
|
function.
|
|
.Sh RETURN VALUES
|
|
Function
|
|
.Fn elf_rand
|
|
returns
|
|
.Ar offset
|
|
if successful or zero in case of an error.
|
|
.Sh EXAMPLES
|
|
To process all the members of an archive use:
|
|
.Bd -literal -offset indent
|
|
off_t off;
|
|
Elf *archive, *e;
|
|
\&...
|
|
cmd = ELF_C_READ;
|
|
archive = elf_begin(fd, cmd, NULL);
|
|
while ((e = elf_begin(fd, cmd, archive)) != (Elf *) 0)
|
|
{
|
|
... process `e' here ...
|
|
elf_end(e);
|
|
|
|
off = ...new value...;
|
|
if (elf_rand(archive, off) != off) {
|
|
... process error ...
|
|
}
|
|
}
|
|
elf_end(archive);
|
|
.Ed
|
|
.Pp
|
|
To rewind an archive, use:
|
|
.Bd -literal -offset indent
|
|
Elf *archive;
|
|
\&...
|
|
if (elf_rand(archive, SARMAG) != SARMAG) {
|
|
... error ...
|
|
}
|
|
.Ed
|
|
.Sh ERRORS
|
|
Function
|
|
.Fn elf_rand
|
|
may fail with the following errors:
|
|
.Bl -tag -width "[ELF_E_RESOURCE]"
|
|
.It Bq Er ELF_E_ARGUMENT
|
|
Argument
|
|
.Ar archive
|
|
was null.
|
|
.It Bq Er ELF_E_ARGUMENT
|
|
Argument
|
|
.Ar archive
|
|
was not a descriptor for an
|
|
.Xr ar 1
|
|
archive.
|
|
.It Bq Er ELF_E_ARCHIVE
|
|
Argument
|
|
.Ar offset
|
|
did not correspond to the start of an archive member header.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr ar 1 ,
|
|
.Xr elf 3 ,
|
|
.Xr elf_begin 3 ,
|
|
.Xr elf_end 3 ,
|
|
.Xr elf_getarsym 3 ,
|
|
.Xr elf_next 3 ,
|
|
.Xr gelf 3
|