Program received signal: �EXC_BAD_ACCESS�? Post: 302524558

Sponsored Content

Top Forums Programming Program received signal: �EXC_BAD_ACCESS�? Post 302524558 by achenle on Monday 23rd of May 2011 08:45:20 PM

05-23-2011

Registered User

Quote:

Originally Posted by Corona688

Code:

char *string1;

This is a character pointer. On a 32-bit system, it takes 4 bytes, on a 64-bit system, 8 bytes. When I type in 'slartibartfast', where is it going to put it?

Inside the pointer? No, not enough room, and besides -- that's not how pointers work. The idea of a pointer is that it points to the memory you want to use, right?

So what memory have you got the pointer pointing to? Nothing? Uh-oh.

That leaves it at a random garbage value. Since pointers have no magic power of predicting what you want to do to them, it doesn't create memory for you to put things in and the pointer remains at what it started at -- some random garbage value. So scanf tries to store it in some undefined location in memory which naturally crashes

You should make the pointer actually point to something if you expect it to work. char string1[128]; or char *string1=malloc(128);

A string of characters such as "ABCD" is a character array. That we all know.

But an array evaluates to the address of it's first element, so when you see "ABCD" in an expression, it is effectively treated as a char *.

So the statement

Code:

char *string = "ABCD"

is perfectly valid. The pointer "string" is a char * value that is assigned the address of the first element of the "ABCD" array.

The OP's problem is he's trying to concatenate another string on the end of a static, constant array - his strcat() call is trying to write to the memory immediately following where his "tar czvf YourNewFile.tar.gz " string is stored.

And that appears to be read-only memory. Which is better than nuking whatever data is there.

achenle

View Public Profile for achenle

Find all posts by achenle

10 More Discussions You Might Find Interesting

1. Programming

Program received signal SIGABRT, Aborted.

I ran degugger in C++ and the followings are the message I got: Program received signal SIGABRT, Aborted. 0x002a57a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2 (gdb) info s #0 0x002a57a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2 #1 0x002e97f5 in raise () from /lib/tls/libc.so.6...

2. Programming

Program received signal SIGSEGV, Segmentation fault.

Dear all, I used debugger from C++ and these are the message I got: Program received signal SIGSEGV, Segmentation fault. 0x00323fc0 in free () from /lib/tls/libc.so.6 (gdb) info s #0 0x00323fc0 in free () from /lib/tls/libc.so.6 #1 0x00794fa1 in operator delete () from...

3. Forum Support Area for Unregistered Users & Account Problems

no email received

I have tried to register and got a message saying an email would be sent but no email has turned up. Could you try again please?

4. AIX

Received signal #11, SIGSEGV [default] on AIX 6.1

Hello, One of our customer is getting segmentation fault when he runs his shell script which invokes our executable on AIX 6.1. On AIX 5.3, there were no issues. Here is the truss output. 811242: __loadx(0x0A040000, 0xF0D3A26C, 0x00000000, 0x00000009, 0x00000000) = 0xF026E884...

5. AIX

nim: error signal number 2 received

Hi to all, i am trying to make mksysb backup of a NIM client machine from NIM master and while i am reading that the backup is done successfully i get an error message below and it doesnt exit the smit screen. also the status of the command appears to be running. is there anybody who knows why...

6. Programming

Please help:program hang stuck there signal handling on POSIX Message Queue UNIX C programming

in a single main() function,so need signal handling. Use Posix Message Queue IPC mechanism , can ignore the priority and other linked list message,to implement the scenario: client:Knock Knock server:who's there client: Eric Server:Eric,Welcome. client:exit all process terminated ...

7. Programming

Why do I receive Program received signal SIGABRT, Aborted?

Im using gdb and when a user disconnects from my server I receive a message Program received signal SIGABRT, Aborted. 0x7ffe0304 in ?? () I was hoping someone here might have a explination for this message in gdb

8. Forum Support Area for Unregistered Users & Account Problems

No activation email received

I have tried to register today with the username BatterBits, but have not received the activation email I do not live in any of the restricted countries - unless the UK has suddenly become a threat! I'd be grateful if you would assist. many thanks Ian

9. UNIX for Beginners Questions & Answers

Error received

I have a program that i need to get done that gets the person's name and his grade then prints it in this order "name-grade-gradeletter" so i wrote this code: #!/bin/bash while :; do read -p "Enter the person's name: " name read -p "Enter the grade of the person: " grade case $grade in )...

10. Shell Programming and Scripting

Any help gratefully received

Multiple questions coming your way. A little back ground info as to why I am back to basics. A dear friend of mine passed away recently and as a request by him I have promised to keep his project alive. The problem I have it was being handed over when he was in the last weeks of his life and...

LEARN ABOUT REDHAT

droplang

DROPLANG(1)						  PostgreSQL Client Applications					       DROPLANG(1)

NAME

       droplang - remove a PostgreSQL procedural language

SYNOPSIS

       droplang [ connection-options... ] langname [ dbname ]

       droplang [ connection-options... ]  --list | -l dbname

DESCRIPTION

       droplang is a utility for removing an existing programming language from a PostgreSQL database.	droplang can drop any procedural language,
       even those not supplied by the PostgreSQL distribution.

       Although backend programming languages can be removed directly using several SQL commands, it is recommended to	use  droplang  because	it
       performs a number of checks and is much easier to use. See DROP LANGUAGE [drop_language(7)] for more.

OPTIONS

       droplang accepts the following command line arguments:

       langname
	      Specifies the name of the backend programming language to be removed.

       [-d] dbname

       [--dbname] dbname
	      Specifies  from which database the language should be removed.  The default is to use the database with the same name as the current
	      system user.

       -e

       --echo Displays SQL commands as they are executed.

       -l

       --list Shows a list of already installed languages in the target database (which must be specified).

       droplang also accepts the following command line arguments for connection parameters:

       -h host

       --host host
	      Specifies the host name of the machine on which the server is running. If host begins with a slash, it is used as the directory  for
	      the Unix domain socket.

       -p port

       --port port
	      Specifies the Internet TCP/IP port or local Unix domain socket file extension on which the server is listening for connections.

       -U username

       --username username
	      User name to connect as

       -W

       --password
	      Force password prompt.

ENVIRONMENT

       PGDATABASE

       PGHOST

       PGPORT

       PGUSER Default connection parameters.

DIAGNOSTICS

       Most error messages are self-explanatory. If not, run droplang with the --echo option and see under the respective SQL command for details.
       Check also under psql(1) for more possibilities.

NOTES

       Use createlang(1) to add a language.

EXAMPLES

       To remove pltcl:

       $ droplang pltcl dbname

SEE ALSO

       createlang(1), DROP LANGUAGE [drop_language(7)]

Application							    2002-11-22							       DROPLANG(1)