diff options
Diffstat (limited to 'web/apache/service.txx')
| -rw-r--r-- | web/apache/service.txx | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/web/apache/service.txx b/web/apache/service.txx index 961c19b..1d0693a 100644 --- a/web/apache/service.txx +++ b/web/apache/service.txx @@ -2,11 +2,10 @@ // copyright : Copyright (c) 2014-2016 Code Synthesis Ltd // license : MIT; see accompanying LICENSE file -#include <unistd.h> // getppid() -#include <signal.h> // kill(), SIGTERM - +#include <httpd.h> // APEXIT_CHILDSICK #include <http_log.h> // APLOG_* +#include <cstdlib> // exit() #include <utility> // move() #include <exception> @@ -65,16 +64,23 @@ namespace web { l.write (nullptr, 0, func_name.c_str (), APLOG_EMERG, e.what ()); - // Terminate the root apache process. Indeed we can only try to - // terminate the process, and most likely will fail in a production - // environment, where the apache root process usually runs under root, - // and worker processes run under some other user. This is why the - // implementation should consider the possibility of not being - // initialized at the time of HTTP request processing. In such a case - // it should respond with an internal server error (500 HTTP status), - // reporting misconfiguration. + // Terminate the worker apache process. APEXIT_CHILDSICK indicates to + // the root process that the worker have exited due to a resource + // shortage. In this case the root process limits the rate of forking + // until situation is resolved. + // + // If the root process fails to create any worker process on startup, + // the behaviour depends on the Multi-Processing Module enabled. For + // mpm_worker_module and mpm_event_module the root process terminates. + // For mpm_prefork_module it keeps trying to create the worker process + // at one-second intervals. + // + // If the root process loses all it's workers while running (for + // example due to the MaxRequestsPerChild directive), and fails to + // create any new ones, it keeps trying to create the worker process + // at one-second intervals. // - kill (getppid (), SIGTERM); + std::exit (APEXIT_CHILDSICK); } catch (...) { @@ -84,9 +90,9 @@ namespace web APLOG_EMERG, "unknown error"); - // Terminate the root apache process. + // Terminate the worker apache process. // - kill (getppid (), SIGTERM); + std::exit (APEXIT_CHILDSICK); } } |