By Kay A. Robbins
Robbins and Robbins (both machine technology, U. of Texas, San Antonio) disguise layout and implementation of trustworthy UNIX software program on Linux, Solaris, Mac OS X, and different POSIX-based structures during this replace of Kay Robbins' functional UNIX Programming (1996). The textual content introduces the necessities of UNIX programming with brief code snippets and sensible examples and routines utilizing the most recent UNIX criteria. themes contain conversation, concurrency, multithreading, records, indications, semaphores, and POSIX threads. This variation good points new chapters on the net, UDP, and server functionality.
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Extra resources for Unix Systems Programming: Communication, Concurrency, and Threads
Example text
10. Consider whether a function is ever called recursively or from a signal handler or from a thread. Functions with variables of static storage class may not behave in the desired way. ) 11. Analyze the consequences of interruptions by signals. 12. Carefully consider how the entire program terminates. 6 Argument Arrays A command line consists of tokens (the arguments) that are separated by white space: blanks, tabs or a backslash (\) at the end of a line. Each token is a string of characters containing no white space unless quotation marks are used to group tokens.
If the utility argument is given, use system to execute utility after the environment has been appropriately changed. Otherwise, print the changed environment to standard output, one entry per line. 4. One way to change the current environment in a program is to overwrite the value of the environ external variable. If you are completely replacing the old environment (-i option), count the number of name=value pairs, allocate enough space for the argument array (don't forget the extra NULL entry), copy the pointers from argv into the array, and set environ.
Analyze the consequences of interruptions by signals. 12. Carefully consider how the entire program terminates. 6 Argument Arrays A command line consists of tokens (the arguments) that are separated by white space: blanks, tabs or a backslash (\) at the end of a line. Each token is a string of characters containing no white space unless quotation marks are used to group tokens. When a user enters a command line corresponding to a C executable program, the shell parses the command line into tokens and passes the result to the program in the form of an argument array.