\" $NetBSD: elf_rand.3,v 1.6 2024/03/03 17:37:33 christos Exp $
\"
\" Copyright (c) 2006,2008 Joseph Koshy. All rights reserved.
\"
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\" modification, are permitted provided that the following conditions
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\" 2. Redistributions in binary form must reproduce the above copyright
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\" 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)
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\" Id: elf_rand.3 3957 2022-03-12 14:11:52Z jkoshy
\"
Dd June 17, 2006
Dt ELF_RAND 3
Os
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
Fa archive
to be adjusted so that the next call to
Xr elf_begin 3
will provide access to the archive member at byte offset
Fa offset
in the archive.
Argument
Fa 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
Fa 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
Fa archive
was null.
It Bq Er ELF_E_ARGUMENT
Argument
Fa archive
was not a descriptor for an
Xr ar 1
archive.
It Bq Er ELF_E_ARCHIVE
Argument
Fa 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
