Changes between Version 49 and Version 50 of io_operations


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Timestamp:
Jan 19, 2018, 1:30:39 PM (4 years ago)
Author:
alain
Comment:

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  • io_operations

    v49 v50  
    142142'''1)''' The TXT[0] terminal is reserved for the kernel. It is normally used by the kernel to display log and/or debug messages. It can only be used by the user processes for debug, through some specific system calls such as the panic() or display_xxx() functions, that should not be used in normal exploitation.
    143143
    144 '''2)''' The other (NB_TXT_CHANNELS - 1) terminals TXT[i] are shared resources used by user processes. During kernel initialization,  ALMOS-MKH creates the first INIT user process, that creates itself (NB_TXT_CHANNELS -1) KSH user processes (one shell per user text terminal). All processes created by a KSH[i] process share the same TXT[i] terminal as the parent process, and belong to the same group of process.  
    145  
     144'''2)''' The other (NB_TXT_CHANNELS - 1) terminals TXT[i] are shared resources used by user processes. During kernel initialization,  ALMOS-MKH creates the first INIT user process, that creates itself (NB_TXT_CHANNELS -1) KSH user processes (one shell per user text terminal). All processes created by a KSH[i] process share the same TXT[i] terminal as the parent process, and belong to the same group of process.
     145
    146146'''3)''' In the present implementation, the INIT process and the the KSH[i] processes are never deleted : they do not call the exit() scale, and cannot be killed.
    147147
     
    152152'''6)''' The control characters (ctrlC , ctrlZ) typed in a TXT_RX[i] terminal are only routed to the foreground process attached to this terminal.
    153153
    154 '''7)''' When a new process is launched in a KSH (using the ''load''command), it becomes the TXT terminal owner, and run in foreground, unless it is launched with the ''&'' attribute on command line. When a child process is directly created by a parent process (using the ''fork()'' syscall), it does not get the the TXT terminal ownership, and run in background.
     154'''7)''' When a new process is launched in a KSH (using the ''load'' command), it becomes the TXT terminal owner, and run in foreground, unless it is launched with the ''&'' attribute on command line. When a child process is directly created by a parent process (using the ''fork()'' syscall), it does not get the the TXT terminal ownership, and run in background.
    155155 
    156156== I) Hardware Specific  ==