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Top Forums Programming Problem shmat in HP-UX Titanium ia64. EINVAL Error Post 302340263 by dairby on Monday 3rd of August 2009 06:07:19 AM
Old 08-03-2009
Problem shmat in HP-UX Titanium ia64. EINVAL Error

I have a process that needs two active connections to the same zone of shared memory simultaneously.

The firs conection works ok, 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)

Steps: Iīm going to shared a integer.
1š.- Create shared memory OK:
iIdentificador = shmget(5000,sizeof(int),IPC_CREAT | 0777); //In the original source the key is not hardcode...

2š.-Connection 1 and view the integer shared. Works OK:
piIntegerShared_1=(int *)shmat(iIdentificador,NULL,0))
printf("\n\t =>Dato compartido [%ld]\n",*piIntegerShared_1);

3š.-Connection 2: ERROR !!!:
if((piIntegerShared_2=(int *)shmat(iIdentificador,NULL,0))==(void*)-1)
printf("\n\n\t ERROR shmat memoria2 [%d] [%s]",errno,strerror(errno));

Output: ERROR shmat memoria2 [22] [Invalid argument]

The connection 2 only works ok, if i before delete the connection 1 with:
shmdt(piIntegerShared_1);

Which is the problem in the step 3?
In Sun,AIX and Digital, i donīt have this problem all connection works ok. Only in HP-UX (Itanium - ia64) 11i Version 2: August 2003

Thanks,
David

Last edited by dairby; 08-03-2009 at 11:59 AM..
 

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SHMAT(2)						      BSD System Calls Manual							  SHMAT(2)

NAME
shmat, shmdt -- map/unmap shared memory SYNOPSIS
#include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> void * shmat(int shmid, void *shmaddr, int shmflg); int shmdt(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
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
shmctl(2), shmget(2), mmap(2) BSD
August 17, 1995 BSD

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