112 lines
3.1 KiB
Groff
112 lines
3.1 KiB
Groff
.\" Copyright (c) 2006 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Joseph Koshy ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 9, 2006
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.Os
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.Dt ELF 3
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.Sh NAME
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.Nm elf_cntl
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.Nd control an elf file descriptor
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.Sh LIBRARY
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.Lb libelf
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.Sh SYNOPSIS
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.In libelf.h
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.Ft int
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.Fn elf_cntl "Elf *elf" "Elf_Cmd cmd"
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.Sh DESCRIPTION
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Function
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.Fn elf_cntl
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controls the ELF library's subsequent use of the file descriptor
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used to create ELF descriptor
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.Ar elf .
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.Pp
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Argument
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.Ar cmd
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informs the library of the action to be taken:
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.Bl -tag -width "ELF_C_FDDONE"
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.It Dv ELF_C_FDDONE
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This value instructs the ELF library not to perform any further
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I/O on the file descriptor associated with argument
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.Ar elf .
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For ELF descriptors opened with mode
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.Ar ELF_C_WRITE
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or
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.Ar ELF_C_RDWR
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subsequent
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.Fn elf_update
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operations on the descriptor will fail.
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.It Dv ELF_C_FDREAD
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This value instructs the ELF library to read in all necessary
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data associated with ELF descriptor
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.Ar elf
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into memory so that the underlying file descriptor can be
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safely closed with command
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.Dv ELF_C_FDDONE .
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.El
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.Pp
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Argument
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.Ar elf
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must be an ELF descriptor associated with a file system object
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(e.g., an
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.Xr ar 1
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archive, an ELF file, or other data file).
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.Sh IMPLEMENTATION NOTES
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Due to use of
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.Xr mmap 2
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internally, this function is a no-op for for ELF objects opened in
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.Dv ELF_C_READ
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mode.
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.Sh RETURN VALUES
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Function
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.Fn elf_cntl
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returns 0 on success, or -1 if an error was detected.
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.Sh ERRORS
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.Bl -tag -width "[ELF_E_RESOURCE]"
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.It Bq Er ELF_E_ARCHIVE
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Argument
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.Ar elf
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is a descriptor for an archive member.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar elf
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was NULL.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar cmd
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was not recognized.
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.It Bq Er ELF_E_MODE
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An
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.Dv ELF_C_FDREAD
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operation was requested on an ELF descriptor opened
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for writing.
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.El
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.Sh SEE ALSO
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.Xr elf 3 ,
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.Xr elf_begin 3 ,
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.Xr elf_end 3 ,
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.Xr elf_next 3 ,
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.Xr elf_update 3 ,
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.Xr gelf 3
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