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Full Discussion: Teach me about dynamic libraries
Operating Systems Solaris Teach me about dynamic libraries Post 302983383 by DerfMan on Monday 10th of October 2016 08:29:06 PM
Old 10-10-2016
Teach me about dynamic libraries
Hi all,
new guy here, first post, with a question.

My background : some linux experience, moved over to OmniOS with Napp-it front end for a home NAS server, but getting more familiar with CLU.

Situation : I built APCUPSD to interface with my UPS. During the configure I specified the following flags:
Code:
./configure \
  --prefix=/usr/local \
  --sbindir=/usr/local/sbin \
  --sysconfdir=/etc/apcupsd \
  --mandir=/usr/local/share/man \
  --with-log-dir=/var/log \
  --disable-cgi \
  --enable-usb

The make and install went fine, but on trying to load the daemon I get the following error.

Code:
#/etc/init.d/apcupsd start
Starting apcupsd power management ...ld.so.1: apcupsd: fatal: libusb.so.1: open failed: No such file or directory
/etc/init.d/apcupsd: line 24: 15893: Killed
        Failed.

The file does exist, but I guess it isn't where it is supposed to be.
Code:
# find / -name libusb.so.1
find: ‘/proc/16084/fd/5': No such file or directory
find: ‘/proc/16084/path/5': No such file or directory
/usr/sfw/lib/libusb.so.1

I was able to solve this by exporting the path
Code:
# export LD_LIBRARY_PATH=/usr/sfw/lib/

Then the daemon worked.

However, whenever the machine reboots, the daemon will fail to load since I need to manually first re-export the path. I feel like manually remembering to do this every reboot is not the correct solution, and just a work-around.

First steps to solution
I'm trying to follow Sun's documentation on "4.3 Setting Library Search Paths and Order" [ I cannot post a direct link yet but google search should point to the doc if you are interested ]

However, I'm not really understanding the differences between dynamic and static linking.

QUESTION

My main question is "how do I solve the problem of LDD finding libusb.so.1 in /usr/sfw/lib/ when a reboot occurs so the APCUPSD daemon auto-starts".

A follow up for my own edification would be to explain dynamic vs static library linking. Do I need to re-compile APCUPSD with flags that point to libusb.so.1? Should I make a sym link pointing to libusb.so.1 in the directory that ldd normally searches?

Thanks in advance for all the help!
 

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LEARN ABOUT CENTOS

libusb

libusb(3LIB)                                                    Interface Libraries                                                   libusb(3LIB)

NAME

       libusb - user-space USB device management library

SYNOPSIS

       cc [ flag... ] -I/usr/sfw/include file... -L/usr/sfw/lib -R/usr/sfw/lib 
       -lusb  [ library... ]
       #include <usb.h>

DESCRIPTION

       The libusb library contains interfaces for managing USB devices without a kernel driver.  It is an open-source API supported on Linux, Mac-
       OS X, and NetBSD. See http://libusb.sourceforge.net.

       The current implementation is version 0.1.8 of the libusb API.

       Complete documentation for this library can be found at /usr/sfw/share/doc/libusb/libusb.txt.

INTERFACES

       The shared object libusb.so.1 provides the following public interfaces. See intro(3) for additional information  on  shared  object  inter-
       faces.

       usb_bulk_read                 usb_bulk_write
       usb_claim_interface           usb_clear_halt
       usb_close                     usb_control_msg
       usb_find_busses               usb_find_devices
       usb_get_busses                usb_get_descriptor_by_endpoint
       usb_get_descriptor            usb_get_string
       usb_get_string_simple         usb_init
       usb_interrupt_read            usb_interrupt_write
       usb_open                      usb_release_interface
       usb_reset                     usb_resetep
       usb_set_altinterface          usb_set_configuration
       usb_set_debug                 usb_strerror

FILES

       /usr/sfw/lib/libusb.so.1        shared object

       /usr/sfw/lib/libusb_plugins     implementation-specific libusb modules

       /usr/sfw/bin/libusb-config      script to determine linking environment

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWlibusb,   SUNWlibusbut,  |
       |                             |SUNWlibugenusb               |
       +-----------------------------+-----------------------------+
       |Interface Stability          |External                     |
       +-----------------------------+-----------------------------+
       |MT-Level                     |Unsafe                       |
       +-----------------------------+-----------------------------+

SEE ALSO

       intro(3), attributes(5)

       http://libusb.sourceforge.net

SunOS 5.10                                                          14 Oct 2004                                                       libusb(3LIB)
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