Linux - NewbieThis Linux forum is for members that are new to Linux.
Just starting out and have a question?
If it is not in the man pages or the how-to's this is the place!
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
Can anyone tell me what area I should be looking in to solve a permission denied error when creating a POSIX semaphore?
I understand that the error means:
the semaphore already exists, and the permissions specified are denied OR the semaphore does not exist, and the permissions specified to create it are denied.
I have three Linux machines, all built with the RHEL 4 distro, using gcc -lrt to link and have the same user id & group id set.
(All three machines are from different vendors, not that the HW probably matters?).
I can create semaphores on two of the machines but not on the third. I am using the same code (NFS mounted machines). What could be set different on the machines that would cause the EACCES (permission denied) error on only one of them???Where/what exactly am I being denied permission to?
if (mySem == SEM_FAILED)
/* Check the error value */
if (errno == EACCES)
/* Permission is denied */
printf("Error: EACCESS Permission denied\n");
/* Show the other error */
printf("Some other error");
/* return; */
/* Process created the semaphore */
printf("Sample data written\n");
printf("Value of mySem=%d \n", a1);
** End seminit.c