author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 19 Aug 2010 11:33:45 +0300 | |
branch | RCL_3 |
changeset 54 | 4332f0f7be53 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/** @file ../include/sys/shm.h |
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@internalComponent |
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*/ |
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/** @fn shmget(key_t key, int size, int shmflg) |
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@param key |
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@param size |
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@param shmflg |
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@return Upon successful completion, shmget returns the positive integer identifier of a shared memory segment. |
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Otherwise, -1 is returned and errno set to indicate the error. |
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@code |
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SHM_R Read access for user. |
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SHM_W Write access for user. |
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( SHM_R>>3 ) |
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Read access for group. |
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( SHM_W>>3 ) |
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Write access for group. |
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( SHM_R>>6 ) |
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Read access for other. |
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( SHM_W>>6 ) |
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Write access for other. |
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@endcode |
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Based on the values of key and shmflg, shmget returns the identifier of a newly created or previously existing shared |
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memory segment. The key |
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is analogous to a filename: it provides a handle that names an |
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IPC object. |
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There are three ways to specify a key: IPC_PRIVATE may be specified, in which case a new IPC object |
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will be created. An integer constant may be specified. |
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If no IPC object corresponding |
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to key is specified and the IPC_CREAT bit is set in shmflg, a new one will be created. The ftok may be used to generate a key from a pathname. |
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@code |
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The mode of a newly created IPC object is determined by OR 'ing the following constants into the shmflg argument: SHM_R Read access for user. SHM_W Write access for user. ( SHM_R>>3 ) Read access for group. ( SHM_W>>3 ) Write access for group. ( SHM_R>>6 ) Read access for other. ( SHM_W>>6 ) Write access for other. |
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@endcode |
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When creating a new shared memory segment, size indicates the desired size of the new segment in bytes. |
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The size |
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of the segment may be rounded up to a multiple convenient to the |
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kernel (i.e., the page size). |
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Examples: |
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@code |
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#include <sys/ipc.h> |
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#include <sys/shm.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <errno.h> |
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#define SHM_SEG_SIZE 1024 |
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int main(void) |
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{ |
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int shm_id; |
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int perm; |
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/* |
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* Create a shared memory segment |
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*/ |
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perm = SHM_R | SHM_W; |
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if ((shm_id = shmget(IPC_PRIVATE, SHM_SEG_SIZE, |
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IPC_CREAT | IPC_EXCL | perm)) |
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== -1) { |
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printf("Shared memory create failed with errno %d", errno); |
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return -1; |
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} |
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return 0; |
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} |
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@endcode |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn shmat(int shmid, const void *shmaddr, int shmflg) |
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@param shmid |
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@param shmaddr |
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@param shmflg |
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Note: This description also covers the following functions - |
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shmdt() |
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|
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@return Upon success, shmat returns the address where the segment is attached; otherwise, -1 |
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is returned and errno is set to indicate the error. The shmdt function returns the value 0 if successful; otherwise the |
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value -1 is returned and errno is set to indicate the error. |
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The shmat system call |
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attaches the shared memory segment identified by shmid to the calling process's address space. |
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The address where the segment |
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is attached is determined as follows: If shmaddr is 0, the segment is attached at an address selected by the |
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kernel. If shmaddr is nonzero and SHM_RND is not specified in shmflg, the segment is attached the specified address. (a nonzero addr is not supported) If addr is specified and SHM_RND is specified, addr is rounded down to the nearest multiple of SHMLBA.(a nonzero addr is not supported) |
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The shmdt system call |
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detaches the shared memory segment at the address specified by shmaddr from the calling process's address space. |
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Examples: |
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@code |
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#include <sys/ipc.h> |
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#include <sys/shm.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <errno.h> |
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|
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#define SHM_SEG_SIZE 1024 |
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|
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int main(void) |
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{ |
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int shm_id; |
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char *shm_addr; |
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/* |
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* Create a shared memory segment |
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*/ |
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if ((shm_id = shmget(IPC_PRIVATE, SHM_SEG_SIZE, |
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IPC_CREAT | IPC_EXCL | 0666)) |
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== -1) { |
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printf("Shared memory create failed with errno %d", errno); |
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return -1; |
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} |
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/* |
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* Attach the shared memory segment to the |
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* process address space |
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*/ |
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if((shm_addr = (char *)shmat(shm_id, NULL, 0)) == (void *)-1) { |
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printf("Shared memory attach failed with errno %d", errno); |
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return -1; |
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} |
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/* |
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* Copy data to shared memory segment |
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*/ |
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strcpy(shm_addr, "some_random_data"); |
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/* |
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* Detach the shared memory segment |
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*/ |
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if(shmdt(shm_addr) == -1) { |
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printf("Shared memory detach failed with errno %d", errno); |
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} |
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/* |
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* Remove the shared memory segment |
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*/ |
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if(shmctl(shm_id, IPC_RMID, NULL) == -1) { |
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printf("Shared memory destroy failed with errno %d", errno); |
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} |
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return 0; |
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} |
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|
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@endcode |
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|
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|
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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155 |
|
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/** @fn shmdt(const void *shmaddr) |
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@param shmaddr |
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Refer to shmat() for the documentation |
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|
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|
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|
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|
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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|
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|
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/** @fn shmctl(int shmid, int cmd, struct shmid_ds *buf) |
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@param shmid |
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@param cmd |
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@param buf |
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@return The shmctl function returns the value 0 if successful; otherwise the |
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value -1 is returned and errno is set to indicate the error. |
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|
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@code |
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IPC_STAT Fetch the segment's struct shmid_ds , |
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storing it in the memory pointed to by buf. |
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IPC_SET Changes the shm_perm.uid, shm_perm.gid, and shm_perm.mode members of the segment's struct shmid_ds to match those of the struct pointed to by buf. |
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IPC_RMID Removes the segment from the system. |
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The removal will not take |
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effect until all processes having attached the segment have exited; |
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however, once the IPC_RMID operation has taken place, no further |
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processes will be allowed to attach the segment. |
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|
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@endcode |
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|
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Performs the action specified by cmd on the shared memory segment identified by shmid: |
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|
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IPC_STAT Fetch the segment's struct shmid_ds , |
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storing it in the memory pointed to by buf. |
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IPC_SET Changes the shm_perm.uid, shm_perm.gid, and shm_perm.mode members of the segment's struct shmid_ds to match those of the struct pointed to by buf. |
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IPC_RMID Removes the segment from the system. |
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|
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The removal will not take |
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effect until all processes having attached the segment have exited; |
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however, once the IPC_RMID operation has taken place, no further |
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processes will be allowed to attach the segment. |
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|
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The shmid_ds |
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structure is defined as follows: |
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@code |
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struct shmid_ds { |
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struct ipc_perm shm_perm; /* operation permission structure */ |
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int shm_segsz; /* size of segment in bytes */ |
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pid_t shm_lpid; /* process ID of last shared memory op */ |
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pid_t shm_cpid; /* process ID of creator */ |
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short shm_nattch; /* number of current attaches */ |
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time_t shm_atime; /* time of last shmat() */ |
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time_t shm_dtime; /* time of last shmdt() */ |
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time_t shm_ctime; /* time of last change by shmctl() */ |
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void *shm_internal; /* sysv stupidity */ |
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}; |
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@endcode |
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|
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Examples: |
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@code |
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#include <sys/ipc.h> |
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#include <sys/shm.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <errno.h> |
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|
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#define SHM_SEG_SIZE 1024 |
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|
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int main(void) |
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{ |
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int shm_id; |
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char *shm_addr; |
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/* |
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* Create a shared memory segment |
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*/ |
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if ((shm_id = shmget(IPC_PRIVATE, SHM_SEG_SIZE, |
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IPC_CREAT | IPC_EXCL | 0666)) |
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== -1) { |
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printf("Shared memory create failed with errno %d", errno); |
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return -1; |
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} |
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/* |
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* Attach the shared memory segment to the |
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* process address space |
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*/ |
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if((shm_addr = (char *)shmat(shm_id, NULL, 0)) == (void *)-1) { |
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printf("Shared memory attach failed with errno %d", errno); |
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return -1; |
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} |
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/* |
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* Copy data to shared memory segment |
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*/ |
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strcpy(shm_addr, "some_random_data"); |
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/* |
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* Detach the shared memory segment |
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*/ |
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if(shmdt(shm_addr) == -1) { |
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printf("Shared memory detach failed with errno %d", errno); |
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} |
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/* |
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* Remove the shared memory segment |
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*/ |
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if(shmctl(shm_id, IPC_RMID, NULL) == -1) { |
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printf("Shared memory destroy failed with errno %d", errno); |
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} |
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return 0; |
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} |
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|
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@endcode |
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|
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|
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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|
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|
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/** @struct shmid_ds |
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|
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Defines a shared memory region |
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|
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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|
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/** @var shmid_ds::shm_perm |
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inode's device |
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*/ |
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|
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/** @var shmid_ds::shm_segsz |
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size of segment in bytes |
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*/ |
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|
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/** @var shmid_ds::shm_lpid |
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process ID of last shared memory op |
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*/ |
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|
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/** @var shmid_ds::shm_cpid |
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process ID of creator |
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*/ |
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|
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/** @var shmid_ds::shm_nattch |
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number of current attaches |
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*/ |
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|
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/** @var shmid_ds::shm_atime |
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time of last shmat() |
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*/ |
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|
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/** @var shmid_ds::shm_dtime |
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time of last shmdt() |
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*/ |
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|
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/** @var shmid_ds::shm_ctime |
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time of last change by shmctl() |
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*/ |
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|
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/** @var shmid_ds::shm_internal |
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sysv stupidity |
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*/ |
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/** @def SHM_RDONLY |
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Attach read-only (else read-write) |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def SHM_RND |
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Round attach address to SHMLBA |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @def SHMLBA |
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Segment low boundary address multiple |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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