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Patch from AEB: improved DESCRIPTION; clarified distinction between 

EACCES and ENOEXEC.
This commit is contained in:
Michael Kerrisk 2005-04-04 13:10:49 +00:00
parent dd1b9170eb
commit 1dba3c20aa
1 changed files with 36 additions and 10 deletions
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42
man2/uselib.2
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@ -25,18 +25,22 @@
.\" Modified by Michael Haardt <michael@moria.de>
.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1996-10-22 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 2004-06-23 by Michael Kerrisk <mtk-manpages@gmx.net>
.\" Modified 2004-06-23 by Michael Kerrisk <mtk16@ext.canterbury.ac.nz>
.\" Modified 2005-01-09 by aeb
.\"
.TH USELIB 2 2004-06-23 "Linux 2.6.7" "Linux Programmer's Manual"
.TH USELIB 2 2005-01-09 "Linux 2.6.10" "Linux Programmer's Manual"
.SH NAME
uselib \- select shared library
uselib \- load shared library
.SH SYNOPSIS
.B #include <unistd.h>
.sp
.BI "int uselib(const char *" library );
.SH DESCRIPTION
\fBuselib\fP selects the shared library binary that will be used by
the calling process.
The system call \fBuselib\fP serves to load
a shared library to be used by the calling process.
It is given a pathname. The address where to load is found
in the library itself. The library can have any recognized
binary format.
.SH "RETURN VALUE"
On success, zero is returned. On error, \-1 is returned, and
.I errno
@ -52,8 +56,9 @@ the following may also be returned:
.B EACCES
The library specified by
.I library
is not readable, or the caller does not have search permission
for one of the directories in the path prefix. (See also
does not have read or execute permission, or the caller does not have
search permission for one of the directories in the path prefix.
(See also
.BR path_resolution (2).)
.TP
.B ENFILE
@ -62,10 +67,30 @@ The system limit on the total number of open files has been reached.
.B ENOEXEC
The file specified by
.I library
is not executable, or does not have the correct magic numbers.
is not an executable of known type,
e.g., does not have the correct magic numbers.
.SH "CONFORMING TO"
\fBuselib()\fP is Linux specific, and should not be used in programs
intended to be portable.
.SH NOTES
\fBuselib()\fP was used by early libc startup code to load
the shared libraries with names found in an array of names
in the binary.
.LP
.\" libc 4.3.1f - changelog 1993-03-02
Since libc 4.3.2, startup code tries to prefix these names
with "/usr/lib", "/lib" and "" before giving up.
.\" libc 4.3.4 - changelog 1993-04-21
In libc 4.3.4 and later these names are looked for in the directories
found in LD_LIBRARY_PATH, and if not found there,
prefixes "/usr/lib", "/lib" and "/" are tried.
.LP
From libc 4.4.4 on only the library "/lib/ld.so" is loaded,
so that this dynamic library can load the remaining libraries needed
(again using this call).
This is also the state of affairs in libc5.
.LP
glibc2 does not use this call.
.SH "SEE ALSO"
.BR ar (1),
.BR gcc (1),
@ -73,5 +98,6 @@ intended to be portable.
.BR ldd (1),
.BR mmap (2),
.BR open (2),
.BR dlopen (3),
.BR capability (7),
.BR ld.so (8)