PHP-FPM implementation Process Source analysis

Author: zhanhailiang Date: 2015-03-09

SAPI\FPM\FPM\FPM_MAIN.C: @main;

2. Fcgi_init ()->fcgi_setup_signals (); Set up the signal processing method;

   Sigaction (SIGUSR1, &new_sa, NULL);
   Sigaction (SIGTERM, &new_sa, NULL);
   Sigaction (Sigpipe, NULL, &old_sa);

4. Sapi_startup (&cgi_sapi_module);
   ->sapi_globals_ctor (&sapi_globals); Initialize global variables;
   ->reentrancy_startup ();

6. FCGI_FD = Fpm_run (&max_requests); Process initialization, calling fork () to create a process

8. Fcgi_init_request (&request, FCGI_FD); Request initialization;

10. while (Fcgi_accept_request (&request) >= 0) {
    5.1. Init_request_info; Request initialization; SG (request_info), SG (sapi_headers)
    5.2. Fpm_request_info ();
    5.3. Php_request_startup (Tsrmls_c);
    Php_start_sapi (); Request global variable initialization;
    Sapi_activate (Tsrmls_c); Request HTTP header information initialization;
    Php_hash_environment (Tsrmls_c); Request environment variable initial listening; such as $_get,$_post,$_env,$_server,$_cookie,$_files is in this step to start; $_request based on Jit_initialization to determine whether real-time initialization is required;
    5.4. Fpm_status_handle_request (Tsrmls_c);
    5.5. Php_fopen_primary_script (&file_handle tsrmls_cc); Open the script;
    5.5. fpm_request_executing ();
    5.7. Php_execute_script (&file_handle tsrmls_cc); Execute the script;
    5.8. Fpm_request_end (Tsrmls_c);
    5.9. Php_request_shutdown ((void *) 0); The request ends, releasing the requested resource in the request life cycle;

12. Fcgi_shutdown (); Release a persisted resource for the request

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