Problem shmat in HP-UX. EINVAL Error


 
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Old 08-03-2009
We load in memory oracle tables. To read the tables, they have associate several indexes. so we have several shared memory segment:
1..n Data Segment
1..n Indexex Segment (1xIndex)
1 Control Segment: To control de access of the table in memory.

One process can need read the same table with different index. (similar to SQL access). And so i need one instance (connection to data segment) for each different index access.

The index segment connection will be different, but the data segment will be the same. It was the problem.





, And these tables can be read by different indexes,
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SHMAT(2)						      BSD System Calls Manual							  SHMAT(2)

NAME
shmat, shmdt -- map/unmap shared memory LIBRARY
Standard C Library (libc, -lc) 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 in existence 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
shmat() will fail if: [EACCES] The calling process has no permission to access this shared memory segment. [ENOMEM] There is not enough available data space for the calling process to map the 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. shmdt() will fail if: [EINVAL] shmaddr is not the start address of a mapped shared memory segment. SEE ALSO
ipcrm(1), ipcs(1), mmap(2), shmctl(2), shmget(2) STANDARDS
The shmat and shmdt system calls conform to X/Open System Interfaces and Headers Issue 5 (``XSH5''). HISTORY
Shared memory segments appeared in the first release of AT&T System V UNIX. BSD
June 17, 2002 BSD

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