Daemon Daemon function

#include <unistd.h>

int daemon (int nochdir,int noclose)

When creating sprite processes, it is often necessary to modify the working directory of the sprite process to the "/" root directory
and redirect the standard input, output, and error output to/dev/null

The daemon function is to modify the root directory to the working directory when the parameter nochdir is 0 o'clock.
Noclose for 0 o'clock, do input, output and error output redirect to/dev/null

Execution successful return 0
Error returned-1

/dev/null is a character device, always filled with dissatisfaction, there will be no data generated. is a black hole.

Daemon Daemon function