12-18-2012
10 More Discussions You Might Find Interesting
1. Programming
i just finished a project for a c++ class that i wrote at home on my computer, compiled with gcc. when i brought the code into school it would not compile, it would complain that cannot call main() function. at school we use ancient borland c++ from 1995. anyway my program has 20 different... (3 Replies)
Discussion started by: norsk hedensk
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2. Shell Programming and Scripting
Ok, I have written a main script which checks a directory contents every 30 secs then sleeps. The subscript does a usermod, if the user is logged on, it sleeps for 30 secs and then trys again over and over again.
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3. Programming
What is the sytax to return an int from C program main back to calling shell?
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4. Shell Programming and Scripting
Hi,
I have a menu driven script that does various tasks, I want to be able to call functions directly from within other unix scripts from my menu script. Is this possible? (12 Replies)
Discussion started by: LiquidChild
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5. Shell Programming and Scripting
Hi,
I have a K shell
a.ksh
function abc {
// Some logic
}
In
b.ksh
i have included the a.ksh
./a.ksh
I want to call the abc function from this b.ksh script.
Thanks
Vijay (2 Replies)
Discussion started by: vijaykrc
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6. UNIX for Dummies Questions & Answers
hi everyone ,
i want to read an option and depending on the option call the program .For ex
#! /bin/ksh
export JAVA_HOME=/home/oracle/jdk1.6.0_20
echo " Please enter mod-modeler, dev - sqldeveloper"
read choice
if ; then
echo ' SQL DEVELOPER IS STARTING NOW ... '
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Discussion started by: kdev
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7. Shell Programming and Scripting
I am trying to understand a program in a book and this program suppose to call other programs which are in the same folder, the other programs are called 'lu' and 'add' but for some reason when it gets to the last line of each case to call these programs there is an error message saying
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8. Shell Programming and Scripting
Greetings,
I m wondering if it's possible do do the following :
I have a simple function called "FindMoveDelete" which does the following :
FindMoveDelete()
{
find . -iname "$FILENAME*.ext" -exec mv {} "$PATH/$VAR" \; &&
find . -maxdepth 1 -type d -iname "$FILENAME*" -exec rm -rf {}... (6 Replies)
Discussion started by: Sekullos
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9. Homework & Coursework Questions
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
I need help moving working code into library function called obj13-lib.pl and call the same function in obj13-2.pl
I am a Linux newbie and this certificate is my first step... (0 Replies)
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10. Shell Programming and Scripting
I'm trying to call some functions in the background so that I can multitask in this script. Not working so hot. The functions I call don't ever seem to get called. I'm doing it the exact same way in another script and it's working like a champ so I'm very confused. Here's a pretty simple repro:
... (7 Replies)
Discussion started by: stonkers
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DLSYM(3) Linux Programmer's Manual DLSYM(3)
NAME
dlsym, dlvsym - obtain address of a symbol in a shared object or executable
SYNOPSIS
#include <dlfcn.h>
void *dlsym(void *handle, const char *symbol);
#define _GNU_SOURCE
#include <dlfcn.h>
void *dlvsym(void *handle, char *symbol, char *version);
Link with -ldl.
DESCRIPTION
The function dlsym() takes a "handle" of a dynamic loaded shared object returned by dlopen(3) along with a null-terminated symbol name, and
returns the address where that symbol is loaded into memory. If the symbol is not found, in the specified object or any of the shared
objects that were automatically loaded by dlopen(3) when that object was loaded, dlsym() returns NULL. (The search performed by dlsym() is
breadth first through the dependency tree of these shared objects.)
Since the value of the symbol could actually be NULL (so that a NULL return from dlsym() need not indicate an error), the correct way to
test for an error is to call dlerror(3) to clear any old error conditions, then call dlsym(), and then call dlerror(3) again, saving its
return value into a variable, and check whether this saved value is not NULL.
There are two special pseudo-handles that may be specified in handle:
RTLD_DEFAULT
Find the first occurrence of the desired symbol using the default shared object search order. The search will include global sym-
bols in the executable and its dependencies, as well as symbols in shared objects that were dynamically loaded with the RTLD_GLOBAL
flag.
RTLD_NEXT
Find the next occurrence of the desired symbol in the search order after the current object. This allows one to provide a wrapper
around a function in another shared object, so that, for example, the definition of a function in a preloaded shared object (see
LD_PRELOAD in ld.so(8)) can find and invoke the "real" function provided in another shared object (or for that matter, the "next"
definition of the function in cases where there are multiple layers of preloading).
The _GNU_SOURCE feature test macro must be defined in order to obtain the definitions of RTLD_DEFAULT and RTLD_NEXT from <dlfcn.h>.
The function dlvsym() does the same as dlsym() but takes a version string as an additional argument.
RETURN VALUE
On success, these functions return the address associated with symbol. On failure, they return NULL; the cause of the error can be diag-
nosed using dlerror(3).
VERSIONS
dlsym() is present in glibc 2.0 and later. dlvsym() first appeared in glibc 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+------------------+---------------+---------+
|Interface | Attribute | Value |
+------------------+---------------+---------+
|dlsym(), dlvsym() | Thread safety | MT-Safe |
+------------------+---------------+---------+
CONFORMING TO
POSIX.1-2001 describes dlsym(). The dlvsym() function is a GNU extension.
NOTES
History
The dlsym() function is part of the dlopen API, derived from SunOS. That system does not have dlvsym().
EXAMPLE
See dlopen(3).
SEE ALSO
dl_iterate_phdr(3), dladdr(3), dlerror(3), dlinfo(3), dlopen(3), ld.so(8)
COLOPHON
This page is part of release 4.15 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 https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 DLSYM(3)