Advanced UNIX Programming - download pdf or read online

By Warren W Gay

ISBN-10: 067231990X

ISBN-13: 9780672319907

Complex 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 booklet builds at the talents and information the reader already possesses. It comprises assurance of web methods, interprocess keep an eye on, dossier process manipulation, synchronization, and masses extra.

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Notice also that the first letter of the ls(1) output is the letter p. This is how FIFO file system objects can be identified. 2BSD implementations of UNIX circa 1982. Sockets permit processes on one UNIX host to communicate over a network with processes on a remote host. Sockets can also be used to communicate with other processes within the same host. ) Local sockets can also exist within the file system. This is the type of socket that can be used only between processes within the same host.

Sometimes those steps can cause the value of errno to be lost. The following example illustrates this: */ int z; int fd; /* status code */ /* open file descriptor */ z = write(fd,buf,n); if ( z == -1 ) { unlink(pathname); /* Write some data */ /* Did this write fail? */ /* Yes, delete half baked file fprintf(stderr,"%s: write error on %s\n", strerror(errno), pathname); In this example, the program insists on calling unlink(2) first to remove the file that the write has failed to write to. It then reports the error, after the file has been deleted.

H> int close(int d); The open(2) call accepts a C string that represents the pathname of the file system object to be opened, some flags, and optionally some permission bits in the mode argument. The return value is either -1 (with errno) if the call fails or a file descriptor value that starts at the value zero. Note The handling of errno is covered in Chapter 3, "Error Handling and Reporting," if you need to know more about this variable. The returned file descriptor is always the lowest unused file descriptor number.

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Advanced UNIX Programming by Warren W Gay

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