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Full Discussion: Problem shmat in HP-UX Titanium ia64. EINVAL Error
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 10:59 AM..
 

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LEARN ABOUT FREEBSD

shmdt

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

NAME

     shmat, shmdt -- attach or detach shared memory

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #include <sys/ipc.h>
     #include <sys/shm.h>

     void *
     shmat(int shmid, const void *addr, int flag);

     int
     shmdt(const void *addr);

DESCRIPTION

     The shmat() system call attaches the shared memory segment identified by shmid to the calling process's address space.  The address where the
     segment is attached is determined as follows:

     o	 If addr is 0, the segment is attached at an address selected by the kernel.

     o	 If addr is nonzero and SHM_RND is not specified in flag, the segment is attached the specified address.

     o	 If addr is specified and SHM_RND is specified, addr is rounded down to the nearest multiple of SHMLBA.

     The shmdt() system call detaches the shared memory segment at the address specified by addr from the calling process's address space.

RETURN VALUES

     Upon success, shmat() returns the address where the segment is attached; otherwise, -1 is returned and errno is set to indicate the error.

     The shmdt() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS

     The shmat() system call will fail if:

     [EINVAL]		No shared memory segment was found corresponding to shmid.

     [EINVAL]		The addr argument was not an acceptable address.

     The shmdt() system call will fail if:

     [EINVAL]		The addr argument does not point to a shared memory segment.

SEE ALSO

     shmctl(2), shmget(2)

BSD
								  August 2, 1995							       BSD
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