Allows a program to be executed as a Unix daemon, running in the background and detached from the terminal, ensuring continued operation even after logging out.
If you are in search of a dependable daemon program, look no further than Unix Network Programming by W. Richard Stevens. This book defines daemon as a program that executes in the background without an associated terminal or login shell. It either waits for a specific event to occur or performs scheduled tasks.
When you start a typical daemon program, it will perform several tasks. First, it will close all open file descriptors, including the standard input, standard output, and standard error. Then, it will change its working directory to the root file system, ensuring it does not consume other file systems.
Next, the program will reset the umask value, run in the background, and disassociate itself from its process group, isolating itself from signals like HUP. Additionally, it will ignore all terminal I/O signals and disassociate itself from the control terminal.
Most daemon programs are self-sufficient. There may be times, though, when you come across one that is not. In those cases, you can use Daemonize to force the program to run as a true Unix daemon, enabling seamless background execution.
When you start a typical daemon program, it will perform several tasks. First, it will close all open file descriptors, including the standard input, standard output, and standard error. Then, it will change its working directory to the root file system, ensuring it does not consume other file systems.
Next, the program will reset the umask value, run in the background, and disassociate itself from its process group, isolating itself from signals like HUP. Additionally, it will ignore all terminal I/O signals and disassociate itself from the control terminal.
Most daemon programs are self-sufficient. There may be times, though, when you come across one that is not. In those cases, you can use Daemonize to force the program to run as a true Unix daemon, enabling seamless background execution.
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