The Linux Programming Interface: a linux and unix system Programming Handbook
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USERS AND GROUPS 153 8.1 The Password File: /etc/passwd ................................................................................... 153 8.2 The Shadow Password File: /etc/shadow ...................................................................... 155 8.3 The Group File: /etc/group......................................................................................... 155 8.4 Retrieving User and Group Information ........................................................................ 157 8.5 Password Encryption and User Authentication............................................................... 162 8.6 Summary.................................................................................................................. 166 8.7 Exercises .................................................................................................................. 166 9 PROCESS CREDENTIALS 167 9.1 Real User ID and Real Group ID.................................................................................. 167 9.2 Effective User ID and Effective Group ID....................................................................... 168 9.3 Set-User-ID and Set-Group-ID Programs ........................................................................ 168 9.4 Saved Set-User-ID and Saved Set-Group-ID ................................................................... 170 9.5 File-System User ID and File-System Group ID................................................................ 171 9.6 Supplementary Group IDs .......................................................................................... 172 9.7 Retrieving and Modifying Process Credentials............................................................... 172 9.7.1 Retrieving and Modifying Real, Effective, and Saved Set IDs ...................... 172 9.7.2 Retrieving and Modifying File-System IDs ................................................. 178 9.7.3 Retrieving and Modifying Supplementary Group IDs ................................. 178 9.7.4 Summary of Calls for Modifying Process Credentials ................................. 180 9.7.5 Example: Displaying Process Credentials ................................................. 182 9.8 Summary.................................................................................................................. 183 9.9 Exercises .................................................................................................................. 184 tải về 6.93 Mb. Chia sẻ với bạn bè của bạn:
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