By Warren W Gay
Complicated UNIX Programming is going past the basics of UNIX programming and offers details and methods the readers must extend their wisdom base. Designed for pro UNIX programmers, this e-book builds at the abilities and data the reader already possesses. It contains assurance of web techniques, interprocess regulate, dossier approach manipulation, synchronization, and lots more and plenty extra.
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Extra info for Advanced UNIX Programming (Sams White Book Series)
When opening a file in order to overwrite it, you can specify the O_TRUNC flag. This causes the file to be emptied prior to open(2) returning successfully. Any prior content of the file is lost. 4 Release and cause certain flock(2) semantics to be applied. Chapter 5, "File Locking," will cover the topic of locking files under UNIX. Closing Files Automatically All files are closed when the current process terminates. However, by default they remain open across calls to the execve(2) function. If you need the open file descriptor to close prior to executing a new program (with execve(2)), then you should apply a call to fcntl(2) using the F_SETFD operation.
This is the type of socket that can be used only between processes within the same host. 5432 $ The example shows that the ls(1) command identifies the socket with the starting letter s. Sockets that connect to remote systems, however, do not appear anywhere in the file system. Symbolic Links UNIX has supported linked files for quite some time. However, the symbolic link is a relatively new concept by UNIX standards. " Normally, files can be linked only when both links are contained on the same file system.
Often this is a value that is greater than or equal to zero. For example, the UNIX open(2) call returns a file descriptor number that can be zero or greater. For pointer return values, a successful return value is normally a non-null pointer. An example is the fopen(3) function, which returns a pointer to a FILE object. As noted previously, under unusual circumstances the null pointer can indicate a successful return from certain exceptional functions (recall shmat(2)). For this reason, the best programming practice is for the programmer to test for failure indication upon return from a function.
Advanced UNIX Programming (Sams White Book Series) by Warren W Gay