shm(5)                                                               shm(5)

NAME
     shm - shared memory facility

SYNOPSIS
     #include <sys/shm.h>

DESCRIPTION
     The <sys/shm.h> header defines the following symbolic constants and
     structure:

     Symbolic constants:

     SHMRDONLY      Attach read-only (else read-write).

     SHMLBA          Segment low boundary address multiple.

     SHMRND         Round attach address to SHMLBA.

     The following data types are defined through typedef:

     shmattt        Unsigned integer used for the number of current
                     attaches that must be able to store values at least as
                     large as a type unsigned short.

     The structure shmidds contains the following members:

     struct ipcperm  shmperm       Operation permission structure.

     int              shmsegsz      Size of segment in bytes.

     pidt            shmlpid       Process ID of last shared memory
                                     operation.

     pidt            shmcpid       Process ID of creator.

     shmattt         shmnattch     Number of current attaches.

     timet           shmatime      Time of last shmat().

     timet           shmdtime      Time of last shmdt().

     timet           shmctime      Time of last change by shmctl().

     The pidt, timet, keyt and sizet types are defined as described in
     <sys/types.h>. The following are declared as functions and may also be
     defined as macros:

     void *shmat(int shmid, const void *shmaddr, int shmflg);
     int   shmctl(int shmid, int cmd, struct shmidds *buf);
     int   shmdt(const void *shmaddr);
     int   shmget(keyt key, sizet size, int shmflg);




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shm(5)                                                               shm(5)

     In addition, all of the symbols from <sys/ipc.h> will be defined when
     this header is included.

SEE ALSO
     shmat(2), shmctl(2), shmdt(2), shmget(2), types(5).

















































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