1USELIB(2)                  Linux Programmer's Manual                 USELIB(2)
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NAME

6       uselib - load shared library
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SYNOPSIS

9       #include <unistd.h>
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11       int uselib(const char *library);
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DESCRIPTION

14       The  system call uselib() serves to load a shared library to be used by
15       the calling process.  It is given a pathname.   The  address  where  to
16       load  is  found in the library itself.  The library can have any recog‐
17       nized binary format.
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RETURN VALUE

20       On success, zero is returned.  On error, -1 is returned, and  errno  is
21       set appropriately.
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ERRORS

24       In  addition to all of the error codes returned by open(2) and mmap(2),
25       the following may also be returned:
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27       EACCES The library specified by library does not have read  or  execute
28              permission,  or  the  caller does not have search permission for
29              one of the directories in the path prefix.  (See also path_reso‐
30              lution(7).)
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32       ENFILE The  system  limit  on  the  total number of open files has been
33              reached.
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35       ENOEXEC
36              The file specified by library is  not  an  executable  of  known
37              type, e.g., does not have the correct magic numbers.
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CONFORMING TO

40       uselib() is Linux-specific, and should not be used in programs intended
41       to be portable.
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NOTES

44       uselib() was used by  early  libc  startup  code  to  load  the  shared
45       libraries with names found in an array of names in the binary.
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47       Since  libc  4.3.2,  startup  code  tries  to  prefix  these names with
48       "/usr/lib", "/lib" and "" before giving up.  In libc  4.3.4  and  later
49       these names are looked for in the directories found in LD_LIBRARY_PATH,
50       and if not found there, prefixes "/usr/lib", "/lib" and "/" are tried.
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52       From libc 4.4.4 on only the library "/lib/ld.so"  is  loaded,  so  that
53       this  dynamic  library  can  load the remaining libraries needed (again
54       using this call).  This is also the state of affairs in libc5.
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56       glibc2 does not use this call.
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SEE ALSO

59       ar(1), gcc(1), ld(1), ldd(1), mmap(2),  open(2),  dlopen(3),  capabili‐
60       ties(7), ld.so(8)
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COLOPHON

63       This  page  is  part of release 3.25 of the Linux man-pages project.  A
64       description of the project, and information about reporting  bugs,  can
65       be found at http://www.kernel.org/doc/man-pages/.
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69Linux                             2005-01-09                         USELIB(2)
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