一年后，我問了這個問題，我似乎找到了答案。

(gdb) bt

#0 close () at ../sysdeps/unix/syscall-template.S:84

#1 0x0000000000a40dff in fcgi_close (req=0x1dae3c0, force=0, destroy=1) at /home/dinosaur/Downloads/php-7.2.2/main/fastcgi.c:1311

#2 0x0000000000a41a0d in fcgi_finish_request (req=0x1dae3c0, force_close=0) at /home/dinosaur/Downloads/php-7.2.2/main/fastcgi.c:1670

#3 0x0000000000a4d3b3 in sapi_cgi_deactivate () at /home/dinosaur/Downloads/php-7.2.2/sapi/fpm/fpm/fpm_main.c:828

#4 0x00000000008bcf35 in sapi_deactivate () at /home/dinosaur/Downloads/php-7.2.2/main/SAPI.c:532

#5 0x00000000008afa0e in php_request_shutdown (dummy=0x0) at /home/dinosaur/Downloads/php-7.2.2/main/main.c:1913

#6 0x0000000000a50614 in main (argc=1, argv=0x7ffc8b6936e8) at /home/dinosaur/Downloads/php-7.2.2/sapi/fpm/fpm/fpm_main.c:1994

當php-fpm啟動時，在初始化之后，它會在while循環中處理每個請求

while (fcgi_accept_request(request) >= 0) {

...

php_execute_script(&file_handle); // zend engine compile and run the opcode

...

php_request_shutdown((void *) 0); // close connection

}

在功能fcgi_accept_request中，套接字fd為4

1411 req->fd = accept(listen_socket, (struct sockaddr *)&sa, &len);

(gdb) n

1414 client_sa = sa;

Breakpoint 6, fcgi_accept_request (req=0x1dae3c0) at /home/dinosaur/Downloads/php-7.2.2/main/fastcgi.c:1414

1414 client_sa = sa;

(gdb) p req->fd

$18 = 4

當關閉時，它關閉套接字fd 4

Breakpoint 4, fcgi_close (req=0x1dae3c0, force=0, destroy=1) at /home/dinosaur/Downloads/php-7.2.2/main/fastcgi.c:1272

1272 {

(gdb) p req->fd

$19 = 4

結論

所以，我認為在php7中，請求完成后fpm關閉，因此它不是持久連接？

總結

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