uselib(2)

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 load
16       is  found  in  the  library itself. The library can have any recognized
17       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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28       EACCES The library specified by library does not have read  or  execute
29              permission,  or  the  caller does not have search permission for
30              one of the directories in the path prefix.  (See also path_reso‐
31              lution(2).)
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33       ENFILE The  system  limit  on  the  total number of open files has been
34              reached.
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36       ENOEXEC
37              The file specified by library is  not  an  executable  of  known
38              type, e.g., does not have the correct magic numbers.
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CONFORMING TO

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

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