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Problem shmat in HP-UX. EINVAL Error
Post 302339186 by dairby on Thursday 30th of July 2009 03:31:15 AM
07-30-2009
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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)
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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>
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int pid;
key_t mykey;
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long *shm;
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3. Linux
Hi,
I'm developing a data processing pipeline with multiple stages, with data being moved between the stages using shared memory segments. The size of the data is typically of the order of hundreds of megabytes, and there are typically a few tens of main shared memory segments each of size... (2 Replies)
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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)
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5. Programming
I have a process that needs two active connections to the same zone of shared memory simultaneously.
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int mydrvr_open(struct inode *inode, struct file *filp)
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Hi,
I'm using Ubuntu 10.04 on a 64bit machine.
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8. SuSE
Hi,
My program was running for a whole night. after 12 hours i got an error message "Cannot allocate memory" during the shmat commmand. So can you please let me know what could be the reason? is there any solution?
thanks in advance.
Regards,
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9. Shell Programming and Scripting
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10. Shell Programming and Scripting
Hi
Below script is throwing an error:
repos=root
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root)
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;;
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Error:
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LEARN ABOUT OSX
shmdt
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