08-03-2009
I donīt know if iīm usuing MPAS process. How can I know it ?
---------- Post updated at 04:33 PM ---------- Previous update was at 04:04 PM ----------
Resolved problem:
cc DemoIPC.c -o -N DemoIPC
DemoIPC
chatr +as mpas DemoIPC
Thanks.
10 More Discussions You Might Find Interesting
1. HP-UX
I have installed an application that runs correctly for root but not other users. The application generates an error that indicates users don't have permission to attach to shared memory. A daemon process creates the shared memory segment. I've checked every permission I can think of but nothing... (2 Replies)
Discussion started by: km4hr
2 Replies
2. Programming
The first shmat in my program cannot fetch the start address of the shared memory.
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
int main(int argc,char *argv) {
int pid;
key_t mykey;
int shmid;
long *shm;
long *shm2;
... (3 Replies)
Discussion started by: yong
3 Replies
3. UNIX for Dummies Questions & Answers
I've been searching and cannot seem to find anywhere online a link to a manual for Glance.
Does anyone have a link to this? I searched in here already and the links I found on a post from 2002 were dead.
And more to the point, do you know if you can use Glance to see Disk I/O per logical... (2 Replies)
Discussion started by: LisaS
2 Replies
4. AIX
Hi,
I got this error from AIX 4.3.3/db2 7:
* %SHAREMEM-F-SHMAT Error getting PUTPARM shared memory address , shmid=23029 *
* 3630, errno=13
Anybody who know how to fix this?
Thanks in advance,
itik (1 Reply)
Discussion started by: itik
1 Replies
5. UNIX for Advanced & Expert Users
I have a process that need two active connections to the same zone of shared memory. But when i do the second call to shmat it give me error 22 (EINVAL). Only works ok the second call to shmat if i disconnect the first connection (shmdt)
In Sun,AIX and Digital, i donīt have this problem.
... (7 Replies)
Discussion started by: dairby
7 Replies
6. SuSE
Dear Experts,
i am trying to find whether the given name is file or a directory
dirp = opendir(dirname);
direntp = readdir(dirp);
if(direntp->d_type & DT_DIR)
{
printf("\n is a dirctory");
}
else
{
//dir_or_file = Mtrue;
printf("\n not a directory");
}
it always... (9 Replies)
Discussion started by: vin_pll
9 Replies
7. Emergency UNIX and Linux Support
Hi all,
I'm trying to install of Gbrowse recently. Unfortunately, I stuck at the step to install GD which are prerequisite for Gbrowse installation.
I got try to install it, but it seems like got a lot of error message occurred :(
And still can't fix the problem yet.
I'm using ia64 linux... (10 Replies)
Discussion started by: patrick87
10 Replies
8. Programming
request_irq always returns EINVAL
What am I doing wrong here ?
int mydrvr_open(struct inode *inode, struct file *filp)
{
int ret;
printk("<1> \nModule Opened!");
//disable_irq(4);
//free_irq(4, NULL);
ret = request_irq(4, &imr_interrupt_handler,IRQF_SHARED,... (0 Replies)
Discussion started by: dragonpoint
0 Replies
9. Programming
Hi,
I'm using Ubuntu 10.04 on a 64bit machine.
In my shmat() call, I want to assign fixed memory address to shmaddr variable. I have no idea which address value to give. Some where in the net I read we can make use of sysproc info to know the user space addresses, but could not figure out how... (1 Reply)
Discussion started by: sajjar
1 Replies
10. Emergency UNIX and Linux Support
Hi,
I have a dell T3500 running redhat 4 U8 with a X-Fi Titanium sound card. However alsaconf cant seem to see it. It shows up in lspci:
uname -a
Linux swlin114 2.6.9-89.0.23.ELsmp #1 SMP Fri Mar 5 23:27:13 EST 2010 x86_64 x86_64 x86_64 GNU/Linux
01:00.0 Audio device: Creative Labs... (2 Replies)
Discussion started by: chris.lewis28
2 Replies
SHMAT(2) BSD System Calls Manual SHMAT(2)
NAME
shmat, shmdt -- map/unmap shared memory
SYNOPSIS
#include <sys/shm.h>
void *
shmat(int shmid, const void *shmaddr, int shmflg);
int
shmdt(const void *shmaddr);
DESCRIPTION
shmat() maps the shared memory segment associated with the shared memory identifier shmid into the address space of the calling process. The
address at which the segment is mapped is determined by the shmaddr parameter. If it is equal to 0, the system will pick an address itself.
Otherwise, an attempt is made to map the shared memory segment at the address shmaddr specifies. If SHM_RND is set in shmflg, the system will
round the address down to a multiple of SHMLBA bytes (SHMLBA is defined in <sys/shm.h> ). A shared memory segment can be mapped read-only by
specifying the SHM_RDONLY flag in shmflg. shmdt() unmaps the shared memory segment that is currently mapped at shmaddr from the calling
process' address space. shmaddr must be a value returned by a prior shmat() call. A shared memory segment will remain existant until it is
removed by a call to shmctl(2) with the IPC_RMID command.
RETURN VALUES
shmat() returns the address at which the shared memory segment has been mapped into the calling process' address space when successful,
shmdt() returns 0 on successful completion. Otherwise, a value of -1 is returned, and the global variable errno is set to indicate the error.
ERRORS
The shmat() system call will fail if:
[EACCES] The calling process has no permission to access this shared memory segment.
[EINVAL] shmid is not a valid shared memory identifier. shmaddr specifies an illegal address.
[EMFILE] The number of shared memory segments has reached the system-wide limit.
[ENOMEM] There is not enough available data space for the calling process to map the shared memory segment.
The shmdt() system call will fail if:
[EINVAL] shmaddr is not the start address of a mapped shared memory segment.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
The include files <sys/types.h> and <sys/ipc.h> are necessary for both functions.
SEE ALSO
mmap(2), shmctl(2), shmget(2), compat(5)
BSD
August 17, 1995 BSD