Php-fpm Execution Process source code analysis, php-fpm source code analysis

Php-fpm Execution Process source code analysis, php-fpm source code analysis

Author: zhanhailiang Date:

Sapi \ fpm \ fpm_main.c: @ main;

1. Fcgi_init ()-> fcgi_setup_signals (); set the signal processing method;

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

2. Sapi_startup (& cgi_sapi_module );
   -> Sapi_globals_ctor (& sapi_globals); initialize the global variable;
   -> Reentrancy_startup ();

3. Fcgi_fd = fpm_run (& max_requests); process initialization, call fork () to create a process

4. Fcgi_init_request (& request, fcgi_fd); request initialization;

5. 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); initial listener to request environment variables; for example, $ _ GET, $ _ POST, $ _ ENV, $ _ SERVER, $ _ COOKIE, $ _ FILES is implemented in this step. $ _ REQUEST determines whether real-time Initialization is required based on jit_initialization;
   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 and the resources applied in the request lifecycle are released;

6. Fcgi_shutdown (); release the applied persistent Resource