Download Advanced UNIX Programming by Warren W Gay PDF

By Warren W Gay

ISBN-10: 067231990X

ISBN-13: 9780672319907

Complex UNIX Programming is going past the basics of UNIX programming and provides info and methods the readers must extend their wisdom base. Designed for pro UNIX programmers, this e-book builds at the abilities and information the reader already possesses. It contains assurance of net tactics, interprocess keep watch over, dossier method manipulation, synchronization, and masses extra.

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Flags for open(2) The second argument to open(2) can consist of several flag bits. 1. 1. FreeBSD open(2) Flag Bits Flag O_RDONLY O_WRONLY O_RDWR O_NONBLOCK O_APPEND O_CREAT O_TRUNC O_EXCL O_SHLOCK O_EXLOCK Description Open for read only Open for write only Open for read and write Do not block on open Append with each write Create file if necessary Truncate file to 0 bytes Error if creating and the file already exists Atomically obtain a shared lock Atomically obtain an exclusive lock The flag O_NONBLOCK causes the open(2) call not to block while waiting for the device to be ready.

The values -1 and 4183 both provided a meaningful clue to a programming problem with a message of the form Unknown error: 4183. Had this program used the sys_errlist[] array instead, a program abort may have occurred. Applying strerror(3) Correctly One important thing to note about using the strerror(3) function is that the pointer returned by this function is only valid until the next call to the same function is made. The following code is incorrect: char *eptr1 = strerror(EIO); char *eptr2 = strerror(ENOENT); /*** value of eptr1 is now invalid ***/ printf("Msg1='%s', msg2='%s'\n",eptr1,eptr2); ***/ /*** INCORRECT This code is not acceptable because by the time strerror(3) is called the second time and its return value is assigned to eptr2, the pointer value eptr1 is rubbish.

Fp ) { /* Did the open fail? \n", sys_errlist[errno], /* The error message text */ pathname); /* The file being opened */ exit(13); } This example shows a typical format for error messages from UNIX programs. This typical format used can be summarized as Explanation of error code: Explanation of the operation being attempted Notice that this convention contradicts the format used by the perror(3) function. Using sys_nerr to Range Check Errors The largest error code that is provided for in the sys_errlist[] array is given by the external integer value of sys_nerr minus one.

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Advanced UNIX Programming by Warren W Gay


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