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Des processus et démons sous Unix/Linux Jérémy Lecour — PastisRb et PLUG — avril 2014

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Jesse Storimer jstorimer.com

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Kernel et appels systèmes

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Kernel Matériel Logiciel

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processus Les processus

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ont un id Les processus processus

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ont un parent Les processus processus

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ont des ressources ouvertes Les processus processus

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ont des limites de ressources Les processus processus

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ont un environnement Les processus processus

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ont des arguments Les processus processus

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ont un nom Les processus processus

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ont des codes de retour Les processus processus

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peuvent fourcher Les processus processus

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peuvent virer Zombie Les processus processus

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recevoir des signaux Les processus processus

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processus Signal Value Action Comment ------------------------------------------------------------------------- SIGHUP 1 Term Hangup detected on controlling terminal or death of controlling process SIGINT 2 Term Interrupt from keyboard SIGQUIT 3 Core Quit from keyboard SIGILL 4 Core Illegal Instruction SIGABRT 6 Core Abort signal from abort(3) SIGFPE 8 Core Floating point exception SIGKILL 9 Term Kill signal SIGSEGV 11 Core Invalid memory reference SIGPIPE 13 Term Broken pipe: write to pipe with no readers SIGALRM 14 Term Timer signal from alarm(2) SIGTERM 15 Term Termination signal SIGUSR1 30,10,16 Term User-defined signal 1 SIGUSR2 31,12,17 Term User-defined signal 2 SIGCHLD 20,17,18 Ign Child stopped or terminated SIGCONT 19,18,25 Cont Continue if stopped SIGSTOP 17,19,23 Stop Stop process SIGTSTP 18,20,24 Stop Stop typed at tty SIGTTIN 21,21,26 Stop tty input for background process SIGTTOU 22,22,27 Stop tty output for background process

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peuvent communiquer Les processus processus

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Qu’est-ce qu’un démon

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1. exit if fork 2. Process.setsid 3. exit if fork 4. Dir.chdir "/" 5. STDIN.reopen "/dev/null" 6. STDOUT.reopen "/dev/null", "a" 7. STDERR.reopen "/dev/null", "a"

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1. exit if fork 2. Process.setsid 3. exit if fork 4. Dir.chdir "/" 5. STDIN.reopen "/dev/null" 6. STDOUT.reopen "/dev/null", "a" 7. STDERR.reopen "/dev/null", "a"

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1. exit if fork 2. Process.setsid 3. exit if fork 4. Dir.chdir "/" 5. STDIN.reopen "/dev/null" 6. STDOUT.reopen "/dev/null", "a" 7. STDERR.reopen "/dev/null", "a"

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1. exit if fork 2. Process.setsid 3. exit if fork 4. Dir.chdir "/" 5. STDIN.reopen "/dev/null" 6. STDOUT.reopen "/dev/null", "a" 7. STDERR.reopen "/dev/null", "a"

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1. exit if fork 2. Process.setsid 3. exit if fork 4. Dir.chdir "/" 5. STDIN.reopen "/dev/null" 6. STDOUT.reopen "/dev/null", "a" 7. STDERR.reopen "/dev/null", "a"

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1. exit if fork 2. Process.setsid 3. exit if fork 4. Dir.chdir "/" 5. STDIN.reopen "/dev/null" 6. STDOUT.reopen "/dev/null", "a" 7. STDERR.reopen "/dev/null", "a"

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Merci

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jeremy.lecour@gmail.com @jlecour jeremy.wordpress.com github.com/jlecour