05-27-2008
But sometimes I need to load a shared object and call the function.
In that case the function will be opened and prints messages (log messages) on the terminal.
Loading shared library using dlopen(),locating the function in so using dlsym and executing the function.
Here is the problem.
int (*abc)(int , int)
handle=dlopen("shareobject.so", RTLD_NOW);
abc =dlsym(handle,"fw");
//Executing function "fw" like
(*abc)(x,y)
In this case I need to capture the output only from the last statement.
9 More Discussions You Might Find Interesting
1. Solaris
Hi.
My E250 server (Solaris 8) running oracle database gets hangup in between. I checked the logs in /var/adm/messages but could not find anything related to this. can anyone help me out?
bala (3 Replies)
Discussion started by: balaji_prk
3 Replies
2. UNIX for Advanced & Expert Users
Hi,
I am trying to attach tape drive to sun V890 running Solaris 9 on it.
I have installed HBA(qlogic) in slot 1 of 0-8 slots and booted the system. I do not see HBAin prtdiag output. The tape drive is not attached to HBA. The tape drive I am going to attach is Sony AIT3.
1.How can I make... (3 Replies)
Discussion started by: sriny
3 Replies
3. UNIX for Advanced & Expert Users
Hi friends..
I am using the below command to search few files from many folders which is under one folder..
i mean let say the path is A/B/C...and inside C...i have 1-10 folder...
the below command is working fine....
for i in 1 3 5 7; do
find /A/B/C/${i} -name "*.txt" -o -name "*.csv"... (3 Replies)
Discussion started by: sapan123
3 Replies
4. Red Hat
abb 117.96.113.21
cgg 101.2.104.42
cgg 110.227.247.236
desk 203.20.35.28
png 1.39.242.241
png 1.39.242.241
rzx 101.2.104.42
rzx 115.246.160.36
abb 49.138.242.187
how to find the count of this file wtrto ip
thnx in advance (4 Replies)
Discussion started by: himanshu1.singh
4 Replies
5. Shell Programming and Scripting
Hi
I have a file containing
DE 3'UTR in Homo sapiens alpha-1-B glycoprotein (A1BG), mRNA.
SQ Sequence 216 BP; 37 A; 58 C; 69 G; 52 T; 0 other;
DE 3'UTR in Homo sapiens alpha-1-B glycoprotein (A1BG), mRNA.
SQ Sequence 1844 BP; 358 A; 483 C; 434 G; 569 T; 0 other;
DE 3'UTR in Homo... (1 Reply)
Discussion started by: jyotirmoy21
1 Replies
6. Shell Programming and Scripting
Hi friends,
I need urgent help here:
Issue:
I need to create shell script that will find the files & throw an error through job (autosys) when file not found.
Daily we use to receive 3 files from a system.
Obstacles:
1) All 3 files names are same.
2) Timestamp is same.
3)... (1 Reply)
Discussion started by: tush
1 Replies
7. Shell Programming and Scripting
Hi geeks,
I'm trying to write a below script, but it throws an error, please check and correct me.
#!/bin/bash
#The below script will extract the string error1 error2 and error3 and also it will count and list the occurrence
count1='grep -i "error1" test.txt | wc -l'
count2='grep -i "error2"... (4 Replies)
Discussion started by: naren nandale
4 Replies
8. Shell Programming and Scripting
Hello All,
I want to use scp for copying multiple files ( files locations are stored in an array ) from remote server from different locations without prompting password every time . I will supply password once and it should be able to copy every file mentioned in an array.
eg :-
array have ... (1 Reply)
Discussion started by: manpav
1 Replies
9. Shell Programming and Scripting
I am trying to write a shell script which takes an input file as an arguement in the terminal e.g. bash shellscriptname.sh input.txt. I would like for the file to be read line by line each time checking if the .txt file contains certain words or letters(validating the syntax). If the line being... (1 Reply)
Discussion started by: Gurdza32
1 Replies
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)