shmat() sending signal 11

Posted by Sachin Chourasiya on Stack Overflow See other posts from Stack Overflow or by Sachin Chourasiya
Published on 2010-05-11T13:41:00Z Indexed on 2010/05/11 13:44 UTC
Read the original article Hit count: 153

Filed under:

shmat

|

signals

Please let me know when a call to shmat function can raise a signal 11.

  if ((shmId=shmget(shmKey, 0, 0)) <= 0)  {
     printf( "shmget(0x%x)", shmKey);
     return 0;
  }

  printf( "queueOpen - Key 0x%x gives ID %d", shmKey, shmId);

  qh = shmat(shmId, 0, SHM_RND);

I am getting a signal 11 by the code above. Please help

© Stack Overflow or respective owner

Related posts about shmat

shmat() sending signal 11

as seen on Stack Overflow - Search for 'Stack Overflow'
Please let me know when a call to shmat function can raise a signal 11. if ((shmId=shmget(shmKey, 0, 0)) <= 0) { printf( "shmget(0x%x)", shmKey); return 0; } printf( "queueOpen - Key 0x%x gives ID %d", shmKey, shmId); qh = shmat(shmId, 0, SHM_RND); I am getting a signal… >>> More
How to access variables in shared memory

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to create a shared memory segment containing three integers and an array. The segment is created and a pointer is attached, but when I try to access the values of the variables (whether changing, printing, etc.) I get a segmentation fault. Here is the code I tried: #include <stdio… >>> More
How do you detach an array of strings from shared memory? C

as seen on Stack Overflow - Search for 'Stack Overflow'
I have: int array_id; char* records[10]; // get the shared segment if ((array_id = shmget(IPC_PRIVATE, 1, 0666)) == -1) { perror("Array Creating"); } // attach records[0] = (char*) shmat(array_id, (void*)0, 0); if ((int) *records == -1) { perror("Array Attachment"); } which works… >>> More
How to force two process to run on the same CPU?

as seen on Stack Overflow - Search for 'Stack Overflow'
Context: I'm programming a software system that consists of multiple processes. It is programmed in C++ under Linux. and they communicate among them using Linux shared memory. Usually, in software development, is in the final stage when the performance optimization is made. Here I came to a big… >>> More
Can shared memory be read and validated without mutexes?

as seen on Stack Overflow - Search for 'Stack Overflow'
On Linux I'm using shmget and shmat to setup a shared memory segment that one process will write to and one or more processes will read from. The data that is being shared is a few megabytes in size and when updated is completely rewritten; it's never partially updated. I have my shared memory segment… >>> More

Related posts about signals

Is 37 Signals business advice applicable only to those with a captivated audience already eg courtes

as seen on Stack Overflow - Search for 'Stack Overflow'
I think that most of the advice that comes from 37 Signals is fascinating. I ask this question as i can't help also thinking that the some of the principals will only pull in customers if you have a fan base to call on such as the Ruby On Rails evangilists? >>> More
Scanf with Signals

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a signal that blocks SIGINT and basically says "Sorry, you can't quit.\n" The issue is this can occur during a scanf. When this occurs during a scanf, scanf takes in the printf as input. How can I do a printf that will cause scanf to basically hit the enter key automatically. I don't care… >>> More
Functions connected to signals in QtScript (on Qt 4.5.2) are not firing

as seen on Stack Overflow - Search for 'Stack Overflow'
I've injected into a proprietary Qt (4.5.2) application, added my own compatible build of QtScript, and have managed to get access to all the signals I need. However, when connecting to them (via QtScript) my functions are never called. I've come up with a few theories for why this is and I've tested… >>> More
MPI signal handling

as seen on Stack Overflow - Search for 'Stack Overflow'
When using mpirun, is it possible to catch signals (for example, the SIGINT generated by ^C) in the code being run? For example, I'm running a parallelized python code. I can except KeyboardInterrupt to catch those errors when running python blah.py by itself, but I can't when doing mpirun -np 1… >>> More
Operating systems theory -- using minimum number of semaphores

as seen on Programmers - Search for 'Programmers'
This situation is prone to deadlock of processes in an operating system and I'd like to solve it with the minimum of semaphores. Basically there are three cooperating processes that all read data from the same input device. Each process, when it gets the input device, must read two consecutive data… >>> More