The Linux Programming Interface: a linux and unix system Programming Handbook
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SYSTEM PROGRAMMING CONCEPTS 43 3.1 System Calls ............................................................................................................... 43 3.2 Library Functions ......................................................................................................... 46 3.3 The Standard C Library; The GNU C Library ( glibc ) ......................................................... 47 3.4 Handling Errors from System Calls and Library Functions.................................................. 48 3.5 Notes on the Example Programs in This Book.................................................................. 50 3.5.1 Command-Line Options and Arguments ..................................................... 50 3.5.2 Common Functions and Header Files......................................................... 51 xii Contents in Detail 3.6 Portability Issues.......................................................................................................... 61 3.6.1 Feature Test Macros ................................................................................ 61 3.6.2 System Data Types.................................................................................. 63 3.6.3 Miscellaneous Portability Issues................................................................. 66 3.7 Summary.................................................................................................................... 68 3.8 Exercise ..................................................................................................................... 68 4 FILE I/O: THE UNIVERSAL I/O MODEL 69 4.1 Overview ................................................................................................................... 69 4.2 Universality of I/O ...................................................................................................... 72 4.3 Opening a File: open() ................................................................................................. 72 4.3.1 The open() flags Argument........................................................................ 74 4.3.2 Errors from open() ................................................................................... 77 4.3.3 The creat() System Call ............................................................................ 78 4.4 Reading from a File: read() ........................................................................................... 79 4.5 Writing to a File: write() ............................................................................................... 80 4.6 Closing a File: close() ................................................................................................... 80 4.7 Changing the File Offset: lseek() .................................................................................... 81 4.8 Operations Outside the Universal I/O Model: ioctl() ....................................................... 86 4.9 Summary.................................................................................................................... 86 4.10 Exercises .................................................................................................................... 87 tải về 6.93 Mb. Chia sẻ với bạn bè của bạn:
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