You can't just download an ELF file into memory and execute it because an ELF file needs processing to load in the first place. An ELF file has potentially many separate memory segments with different characteristics, not one glob that it just lives in.
Build a shared library, use dlopen, that's what they're there for. Not to mention that how libraries are handled can depend a lot on your architecture and configuration, doing that manually yourself would be very unportable(not to mention reinventing the wheel.)
It handles everything for you, from filename to symbol name in two easy steps. Here's an example:
Last edited by Corona688; 01-07-2010 at 12:39 PM..
Hi All,
I have a requirement to zip and compress files with dynamic names (which includes date and time component in their names) needs to be compressed with same name.
for example I have a file T.30.SLS_ORD.SO.27.2_2_2.20080623.041415.dat which needs to archived as... (1 Reply)
I have a few questions about elf files and how they are executed.
When gcc compiles a elf file it creates an executable. Is this executable then run directly by the hardware or does the kernel get involved, interpret the elf file and place the asm code directly in memory.
Cheers (0 Replies)
Hello guys,
i'm searching for a solution how to download all files from root-directory of an ftp-server through an ftp proxy
getting through the ftp proxy and download one file with get ist no problem, but mget * does nothing!
ftp -n -i -v <<EOF
open proxyHost proxyPort
user... (19 Replies)
Hi every one,
I have the requirement to download the files from FTP and move those files to unix box. Once after coping the files, i need to remove the files in FTP.
I'm a newbie in Unix script. Can you please suggest a script for this.. Thanks in advance.. (2 Replies)
Hi I have to run the script (a part of the code) in a loop for the no of times the files present in the directory, by taking one file and process and next another file.
For example, if we do ls and the result have:
$ls
abc.dat def.dat ghi.dat
The script code should loop for 3... (4 Replies)
hey
i have a text file thats filled with info like this
$ cat /private/var/lib/apt/lists/idwaneo.org_repo_._Packages
Package: org.idwaneo.ldid
Priority: optional
Section: iDWANEO.org
Maintainer: Admin <admin@idwaneo.org>
Architecture: iphoneos-arm
Version: 610-5
Pre-Depends: dpkg... (1 Reply)
Hello I'm having a little difficulty in writing a shell script for a few simple tasks.
First I have two files "file1.txt" and "file2.txt" and I want to read and compare the last line of each file. The files look like this.
File1.txt
File2.txt
After comparing the two lines I would... (2 Replies)
Hi All,
I got struck at the below point where i am unable to get the desired output after forming the dynamic conditions.Below is the design.
1. We are getting inputs from the shell arguments and storing in a variable like below.
CONDITIONS="1=CT,2=US_10,3=CT_US_10"
2. After this i am... (14 Replies)
Discussion started by: cskumar
14 Replies
LEARN ABOUT ULTRIX
getopt
getopt(3) Library Functions Manual getopt(3)Name
getopt - get option letter from argument vector
Syntax
#include <stdio.h>
int getopt (argc, argv, optstring)
int argc;
char **argv;
char *optstring;
extern char *optarg;
extern int optind, opterr;
Description
The subroutine returns the next option letter in argv that matches a letter in optstring. The optstring is a string of recognized option
letters; if a letter is followed by a colon, the option is expected to have an argument that may or may not be separated from it by white
space. The optarg is set to point to the start of the option argument on return from
The function places in optind the argv index of the next argument to be processed. The external variable optind is automatically initial-
ized to 1 before the first call to
When all options have been processed (that is, up to the first non-option argument), returns EOF. The special option -- may be used to
delimit the end of the options; EOF will be returned, and -- will be skipped.
Diagnostics
The function prints an error message on stderr and returns a question mark (?) when it encounters an option letter that is not included in
optstring. Setting opterr to 0 disables this error message.
Examples
The following code fragment shows how one might process the arguments for a command that can take the mutually exclusive options a and b,
and the options f and o, both of which require arguments:
#include <stdio.h>
main (argc, argv)
int argc;
char **argv;
{
int c;
extern int optind, opterr;
extern char *optarg;
.
.
.
.
while ((c = getopt (argc, argv, "abf:o:")) != EOF)
switch (c) {
case 'a':
if (bflg)
errflg++;
else
aflg++;
break;
case 'b':
if (aflg)
errflg++;
else
bproc( );
break;
case 'f':
ifile = optarg;
break;
case 'o':
ofile = optarg;
bufsiza = 512;
break;
case '?':
errflg++;
}
if (errflg) {
fprintf (stderr, "usage: . . . ");
exit (2);
}
for ( ; optind < argc; optind++) {
if (access (argv[optind], 4)) {
.
.
.
}
See Alsogetopt(1)getopt(3)