SIMPLE SOLUTIONS

USELIB(2) - man page online | system calls

Load shared library.

Chapter
2015-12-28
USELIB(2)                           Linux Programmer's Manual                           USELIB(2)

NAME uselib - load shared library
SYNOPSIS #include <unistd.h> int uselib(const char *library);
DESCRIPTION The system call uselib() 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.
RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS In addition to all of the error codes returned by open(2) and mmap(2), the following may also be returned: EACCES The library specified by library does not have read or execute permission, or the caller does not have search permission for one of the directories in the path pre‐ fix. (See also path_resolution(7).) ENFILE The system-wide limit on the total number of open files has been reached. ENOEXEC The file specified by library is not an executable of a known type; for example, it does not have the correct magic numbers.
CONFORMING TO uselib() is Linux-specific, and should not be used in programs intended to be portable.
NOTES uselib() was used by early libc startup code to load the shared libraries with names found in an array of names in the binary. Since libc 4.3.2, startup code tries to prefix these names with "/usr/lib", "/lib" and "" before giving up. 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. 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. glibc2 does not use this call.
SEE ALSO ar(1), gcc(1), ld(1), ldd(1), mmap(2), open(2), dlopen(3), capabilities(7), ld.so(8)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
Linux 2015-12-28 USELIB(2)
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uselib(2) referred by syscalls(2)
refer to capabilities(7) | dlopen(3) | gcc-5(1) | i686-linux-gnu-ar(1) | ld.so(8) | ldd(1) | mmap(2) | open(2) | path_resolution(7)