Advanced Programming in the UNIX® Environment

ptg10805159 Section 1.4 Files and Directories 7 the comments initalics.The dollar sign that precedes our input is the prompt tha ...

ptg10805159 8 UNIX System Overview Chapter 1 Working Directory Every process has aworking directory,sometimes called thecurrent ...

ptg10805159 Section 1.5 Input and Output 9 #include "apue.h" #define BUFFSIZE 4096 int main(void) { int n; char buf[BUFFSIZE]; w ...

ptg10805159 10 UNIX System Overview Chapter 1 StandardI/O The standardI/O functions provide a buffered interface to the unbuffer ...

ptg10805159 Section 1.6 Programs and Processes 11 Processes and Process ID An executing instance of a program is called aprocess ...

ptg10805159 12 UNIX System Overview Chapter 1 #include "apue.h" #include <sys/wait.h> int main(void) { char buf[MAXLINE]; ...

ptg10805159 Section 1.6 Programs and Processes 13 and returns 0 to the child. Becauseforkcreates a new process, we say that it i ...

ptg10805159 14 UNIX System Overview Chapter 1 Threads and Thread IDs Usually,aprocess has only one thread of control — one set o ...

ptg10805159 Section 1.7 Error Handling 15 extern int *__errno_location(void); #define errno (*__errno_location()) Thereare two r ...

ptg10805159 16 UNIX System Overview Chapter 1 Note that we pass the name of the program—argv[0],whose value is./a.out—as the arg ...

ptg10805159 Section 1.8 User Identification 17 Client versions of Mac OS X ship with the superuser account disabled; server vers ...

ptg10805159 18 UNIX System Overview Chapter 1 Supplementar y Group IDs In addition to the group ID specified in the passwordfile ...

ptg10805159 Section 1.9 Signals 19 11 lines to the program in Figure1.7 gives us the version in Figure1.10. (The11 new lines are ...

ptg10805159 20 UNIX System Overview Chapter 1 1.10 Time Values Historically,UNIX systems have maintained two different time valu ...

ptg10805159 Section 1.11System Calls and Library Functions 21 1.11 System Calls and LibraryFunctions All operating systems provi ...

ptg10805159 22 UNIX System Overview Chapter 1 application code memory allocation functionmalloc sbrk system call kernel user pro ...

ptg10805159 Section 1.12 Summary 23 application code Clibrary functions system calls kernel user process Figure 1.12 Difference ...

ptg10805159 24 UNIX System Overview Chapter 1 The next chapter is about standardization of the UNIX System and the effect of wor ...

ptg10805159 2 UNIX Standardiza tion and Implementa tions 2.1 Introduction Much work has gone into standardizing the UNIX program ...

ptg10805159 26 UNIX Standardization and Implementations Chapter 2 The C standardisnow maintained and developed by the ISO/IEC in ...