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521. String Capabilities
. Next: 8.3 Ncurses - Introduction Up: 8.2.4 Termcap Capabilities Previous: Numeric Capabilities . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node96.html -- 2.4 Кб -- 18.04.1999
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522. Boolean Capabilities
Next: Numeric Capabilities Up: 8.2.4 Termcap Capabilities Previous: 8.2.4 Termcap Capabilities . 5i Printer will not echo on screen . am Automatic margins which means automatic line wrap . ... da Display retained above screen . ... eo A space erases all characters at cursor position . ... hc This is a hardcopy terminal . ... mi Cursor movement works in insert mode . ms Cursor movement works in standout/underline mode . ... xt Teleray glitch, destructive tabs and odd standout mode . ...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node94.html -- 4.0 Кб -- 18.04.1999
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523. Command Line Syntax
. Next: Writing strings to the Up: shmtool: An interactive shared Previous: Background . Writing strings to the segment . Retrieving strings from the segment . Changing the Permissions (mode) . Deleting the segment . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node75.html -- 2.8 Кб -- 18.04.1999
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524. Writing strings to the segment
. Next: Retrieving strings from the Up: Command Line Syntax Previous: Command Line Syntax . shmtool w "text" . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node76.html -- 2.4 Кб -- 18.04.1999
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525. Retrieving strings from the segment
. Next: Changing the Permissions (mode) Up: Command Line Syntax Previous: Writing strings to the . shmtool r . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node77.html -- 2.4 Кб -- 18.04.1999
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526. Changing the Permissions (mode)
. Next: Deleting the segment Up: Command Line Syntax Previous: Retrieving strings from the . shmtool m (mode) . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node78.html -- 2.4 Кб -- 18.04.1999
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527. Deleting the segment
. Next: Examples Up: Command Line Syntax Previous: Changing the Permissions (mode) . shmtool d . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node79.html -- 2.4 Кб -- 18.04.1999
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528. Examples
. Next: The Source Up: shmtool: An interactive shared Previous: Deleting the segment . shmtool w test shmtool w "This is a test" shmtool r shmtool d shmtool m 660 . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node80.html -- 2.4 Кб -- 18.04.1999
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529. The Source
Next: 7 Sound Programming Up: shmtool: An interactive shared Previous: Examples . ... S'); /* Open the shared memory segment - create if necessary */ if(( shmid = shmget(key, SEGSIZE, IPC_CREAT|IPC_EXCL|0666)) == -1) { printf ( Shared memory segment exists - opening as client\n ); /* Segment probably already exists - try as a client */ if(( shmid = shmget(key, SEGSIZE, 0)) == -1) { perror( shmget ); exit(1); } } else { printf ( Creating new shared memory ...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node81.html -- 5.2 Кб -- 18.04.1999
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530. Basic Concepts
Next: Internal and User Data Up: 6.4.4 Shared Memory Previous: 6.4.4 Shared Memory . Shared memory can best be described as the mapping of an area (segment) of memory that will be mapped and shared by more than one process. ... Instead, information is mapped directly from a memory segment, and into the addressing space of the calling process. A segment can be created by one process, and subsequently written to and read from by any number of processes. ... Fri Mar 29 14:43:04 EST 1996 ...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node66.html -- 2.8 Кб -- 18.04.1999
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531. Internal and User Data Structures
. Next: Kernel shmid_ds structure Up: 6.4.4 Shared Memory Previous: Basic Concepts . Let's briefly look at data structures maintained by the kernel for shared memory segments. Kernel shmid_ds structure . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node67.html -- 2.6 Кб -- 18.04.1999
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532. Kernel shmid_ds structure
... One shmid data structure for each shared memory segment in the system. */ struct shmid_ds { struct ipc_perm shm_perm; /* operation perms */ int shm_segsz; /* size of segment (bytes) */ time _t shm_atime; /* last attach time */ time _t shm_dtime; /* last detach time */ time _t shm_ctime; /* last change time */ unsigned short shm_cpid; /* pid of creator */ unsigned short shm_lpid; /* ... Time the last process attached the segment. shm_dtime . ...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node68.html -- 4.9 Кб -- 18.04.1999
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533. SYSTEM CALL: shmget()
Next: SYSTEM CALL: shmat() Up: 6.4.4 Shared Memory Previous: Kernel shmid_ds structure . ... SYSTEM CALL: shmget(); PROTOTYPE: int shmget ( key_t key, int size, int shmflg ); RETURNS: shared memory segment identifier on success -1 on error: errno = EINVAL (Invalid segment size specified) EEXIST (Segment exists, cannot create) EIDRM (Segment is marked for deletion, or was removed) ENOENT (Segment does not exist) EACCES (Permission denied) ENOMEM (Not enough memory to create segment) NOTES: . ...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node69.html -- 6.0 Кб -- 18.04.1999
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534. SYSTEM CALL: shmat()
Next: SYSTEM CALL: shmctl() Up: 6.4.4 Shared Memory Previous: SYSTEM CALL: shmget() . SYSTEM CALL: shmat(); PROTOTYPE: int shmat ( int shmid, char *shmaddr, int shmflg); RETURNS: address at which segment was attached to the process, or -1 on error: errno = EINVAL (Invalid IPC ID value or attach address passed) ENOMEM (Not enough memory to attach segment) EACCES (Permission denied) NOTES: . ... char *attach_segment( int shmid ) { return(shmat(shmid, 0, 0)); } . ...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node70.html -- 4.0 Кб -- 18.04.1999
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535. SYSTEM CALL: shmctl()
... SYSTEM CALL: shmctl(); PROTOTYPE: int shmctl ( int shmqid, int cmd, struct shmid_ds *buf ); RETURNS: 0 on success -1 on error: errno = EACCES (No read permission and cmd is IPC_STAT) EFAULT (Address pointed to by buf is invalid with IPC_SET and IPC_STAT commands) EIDRM (Segment was removed during retrieval) EINVAL (shmqid invalid) EPERM (IPC_SET or IPC_RMID command was issued, but calling process does not have write (alter) access to the segment) NOTES: . ... IPC_SET . ... Marks a segment for...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node71.html -- 4.1 Кб -- 18.04.1999
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536. SYSTEM CALL: shmdt()
Next: shmtool: An interactive shared Up: 6.4.4 Shared Memory Previous: SYSTEM CALL: shmctl() . SYSTEM CALL: shmdt(); PROTOTYPE: int shmdt ( char *shmaddr ); RETURNS: -1 on error: errno = EINVAL (Invalid attach address passed) . After a shared memory segment is no longer needed by a process, it should be detached by calling this system call. As mentioned earlier, this is not the same as removing the segment from the kernel! ... Fri Mar 29 14:43:04 EST 1996 ...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node72.html -- 3.0 Кб -- 18.04.1999
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537. shmtool: An interactive shared memory manipulator
. Next: Background Up: 6.4.4 Shared Memory Previous: SYSTEM CALL: shmdt() . Background . Command Line Syntax . Writing strings to the segment . Retrieving strings from the segment . Changing the Permissions (mode) . Deleting the segment . Examples . The Source . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node73.html -- 3.2 Кб -- 18.04.1999
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538. Background
. Next: Command Line Syntax Up: shmtool: An interactive shared Previous: shmtool: An interactive shared . Our final example of System V IPC objects will be shmtool , which is a command line tool for creating, reading, writing, and deleting shared memory segments. Once again, like the previous examples, the segment is created during any operation, if it did not previously exist. Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node74.html -- 2.6 Кб -- 18.04.1999
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539. Background
Next: Command Line Syntax Up: semtool: An interactive semaphore Previous: semtool: An interactive semaphore . The semtool program relies on command line arguments to determine its behavior. This is what makes it especially useful when called from a shell script. All of the capabilities are provided, from creating and manipulating, to changing the permissions and finally removing a semaphore set. ... Fri Mar 29 14:43:04 EST 1996 ...
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node55.html -- 2.7 Кб -- 18.04.1999
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540. Command Line Syntax
. Next: Creating a Semaphore Set Up: semtool: An interactive semaphore Previous: Background . Creating a Semaphore Set . Locking a Semaphore . Unlocking a Semaphore . Changing the Permissions (mode) . Deleting a Semaphore Set . Converted on: . Fri Mar 29 14:43:04 EST 1996
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Ссылки http://itpm.msu.su/LDP/lpg-0.4/node56.html -- 2.9 Кб -- 18.04.1999
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