Advanced Programming in the UNIX® Environment

ptg10805159 Section 14.3 RecordLocking 487 We previously mentioned two types of locks: a shared read lock (l_type of F_RDLCK)and ...

ptg10805159 488 Advanced I/O Chapter 14 F_SETLKW This command is a blocking version ofF_SETLK.(TheWin the command name meanswait ...

ptg10805159 Section 14.3 RecordLocking 489 Example — Requesting and Releasing a Lock To save ourselves from having to allocate a ...

ptg10805159 490 Advanced I/O Chapter 14 struct flock lock; lock.l_type = type; /* F_RDLCK or F_WRLCK */ lock.l_start = offset; / ...

ptg10805159 Section 14.3 RecordLocking 491 { if (writew_lock(fd, offset, SEEK_SET, 1) < 0) err_sys("%s: writew_lock error", n ...

ptg10805159 492 Advanced I/O Chapter 14 Implied Inheritance and Release of Locks Three rules govern the automatic inheritance an ...

ptg10805159 Section 14.3 RecordLocking 493 Figure14.8 shows the resulting data structures after both the parent and the child ha ...

ptg10805159 494 Advanced I/O Chapter 14 the linked list of locks for the corresponding i-node and releases the locks held by the ...

ptg10805159 Section 14.3 RecordLocking 495 Assuming that we are at end of file when we perform the firstwrite,this operation wil ...

ptg10805159 496 Advanced I/O Chapter 14 We saw in Figure14.2 that Linux 3.2.0 and Solaris 10 provide mandatory recordlocking, bu ...

ptg10805159 Section 14.3 RecordLocking 497 wrote the new contents to a temporary file, removed the original file, and then renam ...

ptg10805159 498 Advanced I/O Chapter 14 pid_t pid; char buf[5]; struct stat statbuf; if (argc != 2) { fprintf(stderr, "usage: %s ...

ptg10805159 Section 14.3 RecordLocking 499 This program creates a file and enables mandatory locking for the file. The program t ...

ptg10805159 500 Advanced I/O Chapter 14 14.4 I/O Multiplexing When we read from one descriptor and write to another, we can use ...

ptg10805159 Section 14.4 I/O Multiplexing 501 network connection is disconnected by thetelnetddaemon), then the child terminates ...

ptg10805159 502 Advanced I/O Chapter 14 I/O multiplexing was provided with theselectfunction in 4.2BSD. This function has always ...

ptg10805159 Section 14.4 I/O Multiplexing 503 tvptr−>tv_sec!= 0 ||tvptr−>tv_usec!= 0 Wait the specified number of seconds ...

ptg10805159 504 Advanced I/O Chapter 14 These interfaces can be implemented as either macros or functions. Anfd_setis set to all ...

ptg10805159 Section 14.4 I/O Multiplexing 505 The reason we have to add 1 to the maximum descriptor number is that descriptors s ...

ptg10805159 506 Advanced I/O Chapter 14 It is important to realize that whether a descriptor is blocking or not doesn’t affect w ...