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Unix Programming FAQ (v1.24) About this FAQ
1.1 Creating new processes: fork() 1.1.1 What does fork() do? 1.1.2 What's the difference between fork() and vfork()? 1.1.3 Why use _exit rather than exit in the child branch of a fork? 1.2 Environment variables 1.2.1 How can I get/set an environment variable from a program? 1.2.2 How can I read the whole environment? 1.3 How can I sleep for less than a second? 1.4 How can I get a finer-grained version of alarm()? 1.5 How can a parent and child process communicate? 1.6 How do I get rid of zombie processes? 1.6.1 What is a zombie? 1.6.2 How do I prevent them from occuring? 1.7 How do I get my program to act like a daemon? 1.8 How can I look at process in the system like ps does? 1.9 Given a pid, how can I tell if it's a running program? 1.10 What's the return value of system/pclose/waitpid? 1.11 How do I find out about a process' memory usage? 1.12 Why do processes never decrease in size? 1.13 How do I change the name of my program (as seen by 'ps')? 1.14 How can I find a process' executable file? 1.14.1 So where do I put my configuration files then?
2.1 How to manage multiple connections? 2.1.1 How do I use select()? 2.1.2 How do I use poll()? 2.1.3 Can I use SysV IPC at the same time as select or poll? 2.2 How can I tell when the other end of a connection shuts down? 2.3 Best way to read directories? 2.4 How can I find out if someone else has a file open? 2.5 How do I 'lock' a file? 2.6 How do I find out if a file has been updated by another process? 2.7 How does the 'du' utility work? 2.8 How do I find the size of a file? 2.9 How do I expand '~' in a filename like the shell does? 2.10 What can I do with named pipes (FIFOs)? 2.10.1 What is a named pipe? 2.10.2 How do I create a named pipe? 2.10.3 How do I use a named pipe? 2.10.4 Can I use a named pipe across NFS? 2.10.5 Can multiple processes write to the pipe simultaneously? 2.10.6 Using named pipes in applications
3.1 How can I make my program not echo input? 3.2 How can I read single characters from the terminal? 3.3 How can I check and see if a key was pressed? 3.4 How can I move the cursor around the screen? 3.5 What are pttys? 3.6 How to handle a serial port or modem?
4.1 How can I tell how much memory my system has? 4.2 How do I check a user's password? 4.2.1 How do I get a user's password? 4.2.2 How do I get shadow passwords by uid? 4.2.3 How do I verify a user's password?
5.1 How do I compare strings using wildcards? 5.1.1 How do I compare strings using filename patterns? 5.1.2 How do I compare strings using regular expressions? 5.2 What's the best way to send mail from a program? 5.2.1 The simple method: /bin/mail 5.2.2 Invoking the MTA directly: /usr/lib/sendmail 5.2.2.1 Supplying the envelope explicitly 5.2.2.2 Allowing sendmail to deduce the recipients
6.1 How can I debug the children after a fork? 6.2 How to build library from other libraries? 6.3 How to create shared libraries / dlls? 6.4 Can I replace objects in a shared library? 6.5 How can I generate a stack dump from within a running program?
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