1.\" $OpenBSD: prebind.8,v 1.1 2006/05/12 23:20:52 deraadt Exp $ 2.\" 3.\" Copyright (c) 2006 Dale Rahn <drahn@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd May 1, 2006 18.Dt PREBIND 8 19.Os 20.Sh NAME 21.Nm prebind 22.Nd cache symbol lookup information to speed up dynamic linking 23.Sh SYNOPSIS 24.Nm prebind 25.Op Fl mv 26.Op Ar file/dir ... 27.Sh DESCRIPTION 28.Nm 29parses each of the specified files or directories and processes each ELF file 30(ELF file found in the directory) and the associated 31.Dv DT_NEEDED 32libraries, 33and writes symbol resolution hint information to each binary and library. 34.Pp 35.Nm 36will add data to the programs specified and any libraries they reference 37to speed up dynamic linking. 38Since version information is stored in the libraries to validate the 39prebind info, running 40.Nm 41on a subset of programs it was previously 42run on will invalidate the prebind info for those excluded binaries. 43The 44.Fl m 45option will preserve the old prebind info in any library if present. 46.Pp 47The options are as follows: 48.Bl -tag -width Ds 49.It Fl m 50Merge into existing prebound libraries. 51This prebinds new binaries without modifying or updating the libraries 52(if prebind data is present), allowing old prebound binaries to continue 53to use the old prebind data. 54.It Fl v 55Be verbose when running 56.Nm : 57prints out information about the file/library that is being processed. 58.El 59.Sh SEE ALSO 60.Xr ld.so 1 , 61.Xr prebind_strip 8 62.Sh STANDARDS 63None 64.Sh HISTORY 65The 66.Nm 67utility first appeared in 68.Ox 4.0 . 69.Nm 70is based loosely on Prelinking, however prelink removes the security 71feature of libraries appearing in random order on each invocation, thus 72it was incompatible with 73.Ox Ns 's 74goals. 75.Nm 76was written as an attempt to improve the speed of dynamic linking 77without the penalty of loss of security features. 78.Sh BUGS 79Prebind uses a lot of memory depending on how many files/libraries 80are being processed. 81Handling of binaries where a required library has been removed is poor. 82