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E.6.3 Process Internals

The fields of a process (for a complete list, see the definition of struct Lisp_Process in process.h) include:

name
A string, the name of the process.
command
A list containing the command arguments that were used to start this process. For a network or serial process, it is nil if the process is running or t if the process is stopped.
filter
If non-nil, a function used to accept output from the process instead of a buffer.
sentinel
If non-nil, a function called whenever the state of the process changes.
buffer
The associated buffer of the process.
pid
An integer, the operating system's process ID. Pseudo-processes such as network or serial connections use a value of 0.
childp
A flag, t if this is really a child process. For a network or serial connection, it is a plist based on the arguments to make-network-process or make-serial-process.
mark
A marker indicating the position of the end of the last output from this process inserted into the buffer. This is often but not always the end of the buffer.
kill_without_query
If this is non-zero, killing Emacs while this process is still running does not ask for confirmation about killing the process.
raw_status
The raw process status, as returned by the wait system call.
status
The process status, as process-status should return it.
tick
update_tick
If these two fields are not equal, a change in the status of the process needs to be reported, either by running the sentinel or by inserting a message in the process buffer.
pty_flag
Non-nil if communication with the subprocess uses a pty; nil if it uses a pipe.
infd
The file descriptor for input from the process.
outfd
The file descriptor for output to the process.
tty_name
The name of the terminal that the subprocess is using, or nil if it is using pipes.
decode_coding_system
Coding-system for decoding the input from this process.
decoding_buf
A working buffer for decoding.
decoding_carryover
Size of carryover in decoding.
encode_coding_system
Coding-system for encoding the output to this process.
encoding_buf
A working buffer for encoding.
inherit_coding_system_flag
Flag to set coding-system of the process buffer from the coding system used to decode process output.
type
Symbol indicating the type of process: real, network, serial.