Login or Register to Ask a Question and Join Our Community


Programming

Program crashes on calling __libc_msgrcv()

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Programming Program crashes on calling __libc_msgrcv()
# 1  
Old 07-19-2011
Program crashes on calling __libc_msgrcv()
Hi,

I am a newbie to linux programming. I have implemented msgqueue in C.
msgrcv() call at the client end is as below:
msgrcv( msgqid, msgptr, msgsize, msgtype, 0 );

My program works fine when msgrcv () from /lib/libc.so.6 is called.
However it crashes when __libc_msgrcv() is called.

I would like to know the difference between msgrcv() and __libc_msgrcv() calls and would like to know under what conditions __libc_msgrcv() would be invoked so that I can recreate the issue.

Thanks in advance for your inputs!!!
# 2  
Old 07-19-2011
Could you please elaborate more, showing the relevant part of your code? __libc_msgrcv and msgrcv are different names for the same function, that in turn is a wrapper to the real system call, named ipc(2) in Linux. (Glibc does this using a GCC extension attribute named "alias"). Normally you should use the standard (system V) name for the function, msgrcv.
# 3  
Old 07-19-2011
Quite often function names that begin with an _ are reserved by the compiler and those that begin with __ by the assembler...so use them carefully as they can cause confusion.
# 4  
Old 07-19-2011
We'll need to see your code to tell you why it's crashing.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

C++ program crashes

Hi, Can anyone tell me why the below program is crashing? and where exactly it is crashing. What is the corrective measure to be taken to make it work fine? #include <iostream> #include <cstring> using namespace std; class CString { char* m_data; public: CString() :... (6 Replies)
Discussion started by: royalibrahim
6 Replies

2. Homework & Coursework Questions

Calling compiled C program with Perl program

Long story short: I'm working inside of a Unix SSH under a bash shell. I have to code a C program that generates a random number. Then I have to call the compiled C program with a Perl program to run the C program 20 times and put all the generated random #s into a text file, then print that text... (1 Reply)
Discussion started by: jdkirby
1 Replies

3. UNIX for Advanced & Expert Users

motif application crashes while calling XtDestroyWidget

Hi All, We have a 32bit Motif Gui application. Now we ported the application from Solaris to Linux and the system is crashing very frequently. On our analysis we could find that this issue happened when we are closing the forms in our application. When the forms are closed we will delete the forms... (0 Replies)
Discussion started by: sanushchacko
0 Replies

4. UNIX for Dummies Questions & Answers

Calling a c program using perl script

On bash I run precompiled c Program as follows: ./create_cust 1 10000 US S > us_cust.csv create_cust is a c program and requires 4 parameters. I am redirecting the output of this program to csv file I need to run this same program in perl I am aware of exec command though not... (7 Replies)
Discussion started by: gkbond
7 Replies

5. Programming

C++ program crashes

Hi, Could anyone tell me the reason why the following program crashes? class A { int x; public: A() { cout << "from A()" << endl; } ~A() { cout << "from ~A()" << endl; } }; class B : public A { public: B() { cout << "from B()"... (2 Replies)
Discussion started by: royalibrahim
2 Replies

6. UNIX for Advanced & Expert Users

calling a Universe program

Can someone offer some technical advice concerning an call to a IBM U2 (Universe) program? When I use the following script from a unix shell, it works fine: $ " xxx.sh " (contains the following --->) 1. cd /links/ACCOUNT1 2. /shapps/ibm/uv/bin/uv "COUNT FILE1" ... (2 Replies)
Discussion started by: smintz
2 Replies

7. UNIX for Advanced & Expert Users

calling program

hi, i have a script.sh on my machine and it used in the system but my question is how can i know the program called this script.sh?? i.e. from where it called and execute?? Many thanks (1 Reply)
Discussion started by: alzuma
1 Replies

8. Shell Programming and Scripting

Calling SHELL script from C program

Hi, I just tried to call a simple script from a pretty simple C program. I could not succeed :-( a message was thrown saying "sh: line 1: "Script name with path": Permission denied" The C program and shell script are below, both are in the same directory and shell script is given... (7 Replies)
Discussion started by: Chanakya.m
7 Replies

9. Programming

AIX 5.3 64-bit program crashes with AIX 5.1

I have an AIX 64-bit program which uses following from AIX5.3 /usr/lib/libc.a(shr_64.o) /usr/lib/libpthread.a(shr_xpg5_64.o) /home/jeet_xp/export/power/usr/lib/libsarpc.a(shr.o) /unix /usr/lib/libcrypt.a(shr_64.o) /usr/lib/libc_r.a(shr_64.o) ... (3 Replies)
Discussion started by: jeet_xp
3 Replies

10. HP-UX

Program crashes with optimization level O2

I am experiencing a difficulty undersatnding why my program (C++, HP UNIX) crashes. It crashes only when I build it with -O (+O2) optimization switch (used in aCC compiler). It works ok with +O0 or +O1 optimization. Also, I see that local variables are shown incorrecly when program is built... (3 Replies)
Discussion started by: Yuriy07
3 Replies
Login or Register to Ask a Question