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#Write() system call
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wary moon
On linux 0 is usually standard input (stdin), 1 stadndard output (stdout) and 2 standard error (stderr).
slow hedge
It can be something other than those
A descriptor is just a number which is unique within the process, which corresponds to something controlled by the OS.
Each program starts with some number of descriptors open. This is determined by the parent process.
Under normal circumstances, every program starts with three descriptors open already: 0, 1, and 2. But you can open more if you chose to, using the open() call.
winter junco
!solved
ember muralBOT
Write() system call