mirror of https://github.com/mkerrisk/man-pages
132 lines
4.2 KiB
Groff
132 lines
4.2 KiB
Groff
.\" Copyright (c) 1992 Drew Eckhardt (drew@cs.colorado.edu), March 28, 1992
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" Modified by Michael Haardt <michael@moria.de>
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.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
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.\" Modified 1996-10-22 by Eric S. Raymond <esr@thyrsus.com>
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.\" Modified 2004-06-23 by Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Modified 2005-01-09 by aeb
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.\"
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.TH USELIB 2 2021-03-22 "Linux" "Linux Programmer's Manual"
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.SH NAME
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uselib \- load shared library
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.SH SYNOPSIS
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.nf
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.B #include <unistd.h>
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.PP
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.BI "int uselib(const char *" library );
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.fi
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.PP
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.IR Note :
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No declaration of this system call is provided in glibc headers; see NOTES.
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.SH DESCRIPTION
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The system call
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.BR uselib ()
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serves to load
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a shared library to be used by the calling process.
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It is given a pathname.
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The address where to load is found
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in the library itself.
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The library can have any recognized
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binary format.
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.SH RETURN VALUE
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On success, zero is returned.
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On error, \-1 is returned, and
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.I errno
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is set to indicate the error.
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.SH ERRORS
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In addition to all of the error codes returned by
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.BR open (2)
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and
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.BR mmap (2),
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the following may also be returned:
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.TP
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.B EACCES
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The library specified by
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.I library
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does not have read or execute permission, or the caller does not have
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search permission for one of the directories in the path prefix.
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(See also
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.BR path_resolution (7).)
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.TP
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.B ENFILE
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The system-wide limit on the total number of open files has been reached.
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.TP
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.B ENOEXEC
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The file specified by
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.I library
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is not an executable of a known type;
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for example, it does not have the correct magic numbers.
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.SH CONFORMING TO
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.BR uselib ()
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is Linux-specific, and should not be used in programs
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intended to be portable.
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.SH NOTES
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This obsolete system call is not supported by glibc.
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No declaration is provided in glibc headers, but, through a quirk of history,
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glibc versions before 2.23 did export an ABI for this system call.
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Therefore, in order to employ this system call,
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it was sufficient to manually declare the interface in your code;
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alternatively, you could invoke the system call using
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.BR syscall (2).
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.PP
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In ancient libc versions (before glibc 2.0),
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.BR uselib ()
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was used to load
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the shared libraries with names found in an array of names
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in the binary.
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.\" .PP
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.\" .\" libc 4.3.1f - changelog 1993-03-02
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.\" Since libc 4.3.2, startup code tries to prefix these names
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.\" with "/usr/lib", "/lib" and "" before giving up.
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.\" .\" libc 4.3.4 - changelog 1993-04-21
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.\" In libc 4.3.4 and later these names are looked for in the directories
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.\" found in
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.\" .BR LD_LIBRARY_PATH ,
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.\" and if not found there,
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.\" prefixes "/usr/lib", "/lib" and "/" are tried.
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.\" .PP
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.\" From libc 4.4.4 on only the library "/lib/ld.so" is loaded,
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.\" so that this dynamic library can load the remaining libraries needed
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.\" (again using this call).
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.\" This is also the state of affairs in libc5.
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.\" .PP
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.\" glibc2 does not use this call.
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.PP
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Since Linux 3.15,
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.\" commit 69369a7003735d0d8ef22097e27a55a8bad9557a
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this system call is available only when the kernel is configured with the
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.B CONFIG_USELIB
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option.
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.SH SEE ALSO
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.BR ar (1),
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.BR gcc (1),
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.BR ld (1),
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.BR ldd (1),
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.BR mmap (2),
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.BR open (2),
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.BR dlopen (3),
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.BR capabilities (7),
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.BR ld.so (8)
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