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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
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+  "This License" refers to version 3 of the GNU Affero General Public License.
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

Makefile

@@ -0,0 +1,7 @@
+all:
+	+make -C src
+
+.PHONY: clean
+
+clean:
+	make -C src clean

README.txt

@@ -0,0 +1,4 @@
+make
+PY_ENTRYPOINT='foo' spawn-fcgi -d . -n src/pyfcgi -p 9000 -a 127.0.0.1
+
+TODO: write a readme

foo.py

@@ -0,0 +1,12 @@
+import sys
+import os
+import time
+
+def entrypoint():
+	sys.stderr.write('Called ! req by %s' % os.getenv('REQUEST_METHOD'))
+	sys.stderr.flush()
+	env = "foo"
+	env = ', '.join(os.environ.keys())
+	msg = "Content-Type: text/html\r\n\r\nHello world !(%0.2f)\nenv : %s" % (time.time(), env)
+	sys.stdout.write(msg)
+	sys.stdout.flush()

includes_python3.7m.patch

@@ -0,0 +1,45 @@
+diff -rupN python3.7m/bytesobject.h python3.7m_patched/bytesobject.h
+--- python3.7m/bytesobject.h	2019-06-30 07:43:17.201934475 +0200
++++ python3.7m_patched/bytesobject.h	2019-06-29 20:16:35.360347551 +0200
+@@ -52,9 +52,9 @@ PyAPI_FUNC(PyObject *) PyBytes_FromStrin
+ PyAPI_FUNC(PyObject *) PyBytes_FromString(const char *);
+ PyAPI_FUNC(PyObject *) PyBytes_FromObject(PyObject *);
+ PyAPI_FUNC(PyObject *) PyBytes_FromFormatV(const char*, va_list)
+-                                Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
++                                Py_GCC_ATTRIBUTE((format(__printf__, 1, 0)));
+ PyAPI_FUNC(PyObject *) PyBytes_FromFormat(const char*, ...)
+-                                Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
++                                Py_GCC_ATTRIBUTE((format(__printf__, 1, 2)));
+ PyAPI_FUNC(Py_ssize_t) PyBytes_Size(PyObject *);
+ PyAPI_FUNC(char *) PyBytes_AsString(PyObject *);
+ PyAPI_FUNC(PyObject *) PyBytes_Repr(PyObject *, int);
+diff -rupN python3.7m/pyerrors.h python3.7m_patched/pyerrors.h
+--- python3.7m/pyerrors.h	2019-06-30 07:43:17.201934475 +0200
++++ python3.7m_patched/pyerrors.h	2019-06-29 20:16:35.360347551 +0200
+@@ -494,9 +494,9 @@ PyAPI_FUNC(int) PyUnicodeTranslateError_
+ 
+ #include <stdarg.h>
+ PyAPI_FUNC(int) PyOS_snprintf(char *str, size_t size, const char  *format, ...)
+-                        Py_GCC_ATTRIBUTE((format(printf, 3, 4)));
++                        Py_GCC_ATTRIBUTE((format(__printf__, 3, 4)));
+ PyAPI_FUNC(int) PyOS_vsnprintf(char *str, size_t size, const char  *format, va_list va)
+-                        Py_GCC_ATTRIBUTE((format(printf, 3, 0)));
++                        Py_GCC_ATTRIBUTE((format(__printf__, 3, 0)));
+ 
+ #ifdef __cplusplus
+ }
+diff -rupN python3.7m/sysmodule.h python3.7m_patched/sysmodule.h
+--- python3.7m/sysmodule.h	2019-06-30 07:43:17.205934339 +0200
++++ python3.7m_patched/sysmodule.h	2019-06-29 20:16:35.360347551 +0200
+@@ -19,9 +19,9 @@ PyAPI_FUNC(void) PySys_SetArgvEx(int, wc
+ PyAPI_FUNC(void) PySys_SetPath(const wchar_t *);
+ 
+ PyAPI_FUNC(void) PySys_WriteStdout(const char *format, ...)
+-                 Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
++                 Py_GCC_ATTRIBUTE((format(__printf__, 1, 2)));
+ PyAPI_FUNC(void) PySys_WriteStderr(const char *format, ...)
+-                 Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
++                 Py_GCC_ATTRIBUTE((format(__printf__, 1, 2)));
+ PyAPI_FUNC(void) PySys_FormatStdout(const char *format, ...);
+ PyAPI_FUNC(void) PySys_FormatStderr(const char *format, ...);
+ 

src/Makefile

@@ -0,0 +1,21 @@
+CC=gcc
+CFLAGS=-c -Wall `python3-config --includes`
+#CFLAGS=-c -Wall -Werror `python3-config --includes`
+LDFLAGS=`python3-config --libs` -lfcgi
+#LDFLAGS= -L`python3-config --configdir` `python3-config --libs` -lfcgi
+
+SRCS=$(wildcard *.c)
+OBJS=$(SRCS:.c=.o)
+
+all: pyfcgi
+
+pyfcgi: $(OBJS)
+	$(CC) $(LDFLAGS) -o $@ $^
+
+%.o: %.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+.PHONY: clean
+
+clean:
+	@rm -v $(OBJS)

src/config.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2019 Weber Yann
+ * 
+ * This file is part of PyFCGI.
+ * 
+ * PyFCGI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ * 
+ * PyFCGI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with PyFCGI.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#define _GNU_SOURCE

src/main.c

@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2019 Weber Yann
+ * 
+ * This file is part of PyFCGI.
+ * 
+ * PyFCGI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ * 
+ * PyFCGI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with PyFCGI.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <fcgi_stdio.h> /* fcgi library; put it first*/
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "responder.h"
+
+#define IDENT_FMT "pyfcgi[%d]"
+#define MAX_REQS 5
+
+#define EARLY_ERR(err_str) write(2, err_str, strlen(err_str))
+
+int main(int argc, char **argv)
+{
+	char *ident, *py_entrypoint;
+	size_t ident_len;
+	pid_t child;
+	int child_ret;
+	unsigned int emerg_sleep = 3;
+
+	py_entrypoint = getenv("PY_ENTRYPOINT");
+	if(argc > 1 || !py_entrypoint)
+	{
+		EARLY_ERR("Usage : PY_ENTRYPOINT='PATH.py' spawn-fcgi [OPTIONS] ");
+		EARLY_ERR(argv[0]);
+		EARLY_ERR("\n");
+		return 1;
+	}
+
+	ident_len = snprintf(NULL, 0, IDENT_FMT, getpid());
+	ident_len++;
+	ident = malloc(sizeof(char)*ident_len);
+	if(ident == NULL)
+	{
+		EARLY_ERR("Unable to allocate memory for ident string...\n");
+		return -1;
+	}
+
+	snprintf(ident, ident_len, IDENT_FMT, getpid());
+
+	openlog(ident, LOG_CONS | LOG_PERROR, LOG_DAEMON | LOG_USER);
+	syslog(LOG_INFO, "New server started");
+
+	while(1)
+	{
+		child = fork();
+		if(child == -1)
+		{
+			// TODO : Error
+			syslog(LOG_EMERG, "Failed to fork : '%s' sleeping %ds", strerror(errno), emerg_sleep);
+			sleep(emerg_sleep);
+			continue;
+		}
+		else if(!child)
+		{
+			responder_loop(py_entrypoint, MAX_REQS, 1, 1);
+			exit(-1);
+		}
+		waitpid(child, &child_ret, 0);
+		if(child_ret)
+		{
+			syslog(LOG_ERR, "Responder loop function exits with error code '%d'",
+				WEXITSTATUS(child_ret));
+		}
+		else
+		{
+			syslog(LOG_NOTICE, "Restarting main process after %d requests", MAX_REQS);
+		}
+	}
+
+	closelog();
+	free(ident);
+}

src/pyworker.c

@@ -0,0 +1,581 @@
+/*
+ * Copyright (C) 2019 Weber Yann
+ * 
+ * This file is part of PyFCGI.
+ * 
+ * PyFCGI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ * 
+ * PyFCGI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with PyFCGI.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "pyworker.h"
+
+static int worker_piper_sigrcv = 0;
+
+pid_t spawn(char* py_entrypoint, int wrk_id, int semid, int max_reqs)
+{
+	pid_t res;
+
+	res = fork();
+	if(res == -1)
+	{
+		syslog(	LOG_ERR, "Fork fails for worker #%d : %s",
+			wrk_id, strerror(errno));
+		return -1;
+	}
+	else if(!res)
+	{
+		// Child process
+		exit(work(py_entrypoint, wrk_id, semid, max_reqs));
+	}
+	syslog(	LOG_INFO,
+		"Worker #%d spawned with PID %d", wrk_id, res);
+	return res;
+}
+
+int work(char* py_entrypoint, int wrk_id, int semid, int max_reqs)
+{
+	PyObject *entry_fun;
+	int count, pipe_out[2], pipe_err[2], pipe_ctl[2], err, piper_status;
+	struct sigaction act;
+	sigset_t emptyset;
+	char buf[PIPE_BUF];
+
+
+	// preparing sigaction for piper
+	if(sigemptyset(&emptyset))
+	{
+		err = errno;
+		syslog(	LOG_ALERT, "sigemptyset fails in piper : %s",
+			strerror(err));
+		exit(err);
+	}
+	act.sa_handler = worker_piper_sighandler;
+	act.sa_mask = emptyset;
+	act.sa_flags = 0;
+	act.sa_restorer = NULL;
+
+
+	syslog(	LOG_INFO,
+		"Worker %d started", wrk_id);
+
+	update_python_path(); // add cwd to python path
+	Py_Initialize(); // "start" python
+	update_python_fd(pipe_out, pipe_err);
+	syslog(	LOG_INFO,
+		"Worker[%d] Python started", wrk_id);
+
+	// loading module
+	entry_fun = import_entrypoint(py_entrypoint);
+
+	syslog(	LOG_INFO,
+		"Worker[%d] Waiting request with %s.%s()", wrk_id,
+		py_entrypoint, PYENTRY_FUNNAME);
+
+	count = 0;
+	while ((!count || count != max_reqs) && FCGI_Accept() >= 0)
+	{
+		count++;
+		syslog(	LOG_INFO,
+			"Worker[%d] request %d", wrk_id, count);
+		worker_piper_sigrcv = 0;
+		pipe(pipe_ctl); //TODO : check for pipe error
+		pid_t pid = fork();
+		if(pid < 0)
+		{
+			err = errno;
+			syslog(LOG_ALERT,
+			       "Worker[%d] req #%d Fork failed for piper : %s",
+			       wrk_id, count, strerror(err));
+			exit(err);
+		}
+		if(!pid)
+		{
+			if(sigaction(WPIPER_SIG, &act, NULL))
+			{
+				err = errno;
+				syslog(	LOG_ALERT, "Unable to sigaction in piper : %s",
+					strerror(err));
+				exit(err);
+			}
+			close(pipe_ctl[0]);
+			close(pipe_ctl[1]);
+	
+			worker_piper(wrk_id, count, pipe_out[0], pipe_err[0],
+			             pipe_ctl[1]);
+			//printf("Content-type: text/html\r\n\r\nHello world !\n");
+			exit(1);
+		}
+		//TODO : update environ !!!
+		//TODO : check if pipe_ctl lock is really needed anymore
+		close(pipe_ctl[1]);
+		PyObject_CallObject(entry_fun, NULL);
+		if(PyErr_Occurred())
+		{
+			log_expt(LOG_ERR);
+		}
+		else
+		{
+			syslog(LOG_DEBUG, "Worker[%d] request %d funcall [OK]",
+				wrk_id, count);
+		}
+		//TODO : flush pystdout & pystderr using python
+		read(pipe_ctl[0], &buf, 1); // unblock when child ready
+syslog(LOG_DEBUG, "PIPER UNLOCK");
+		kill(pid, WPIPER_SIG);
+		waitpid(pid, &piper_status, 0);
+		if(piper_status)
+		{
+			syslog(LOG_WARNING,
+			       "Woker[%d] req #%d piper exited with error status %d",
+			       wrk_id, count, piper_status);
+		}
+		syslog(LOG_DEBUG, "Worker[%d] request %d END [OK]",
+			wrk_id, count);
+	}
+	exit(count == max_reqs ?0:42);
+}
+
+void worker_piper(int wrk_id, int req_id, int pystdout, int pystderr,
+	int ctl_pipe)
+{
+	struct pollfd fds[2];
+	int err, poll_ret, ret, cont;
+	short revents;
+	char buf[PIPE_BUF];
+
+	syslog(LOG_DEBUG, "Worker[%d] req #%d piper", wrk_id, req_id);
+
+	fds[0].fd = pystdout;
+	fds[1].fd = pystderr;
+	fds[0].events = fds[1].events = POLLIN;
+	fds[0].revents = fds[1].revents = 0;
+
+
+	cont = 3;
+	while(cont)
+	{
+		poll_ret = poll(fds, 2, 10);
+syslog(LOG_DEBUG, "Worler[%d] req #%d poll_ret = %d", wrk_id, req_id, poll_ret);
+		if(poll_ret < 0)
+		{
+			err = errno;
+			if(err == EINTR)
+			{
+				continue;
+			}
+			syslog( LOG_WARNING, "Poll error : %s",
+			        strerror(err));
+			fds[0].revents = fds[1].revents = 0;
+			continue;
+		}
+		if(!poll_ret && worker_piper_sigrcv)
+		{
+			cont--;
+			continue;
+		}
+		if(poll_ret && (revents = fds[0].revents))
+		{
+			syslog(LOG_DEBUG, "Worker[%d] req #%d STDOUT evt !",
+			       wrk_id, req_id);
+			poll_ret--;
+			if(revents & POLLIN)
+			{
+				syslog(LOG_DEBUG, "Worker[%d] req #%d POLLIN STDOUT !",
+				       wrk_id, req_id);
+				while(1)
+				{
+					ret = read(pystdout, buf, PIPE_BUF);
+					syslog(LOG_DEBUG, "Worker[%d] req #%d read(stdout) ret %d",
+					       wrk_id, req_id, ret);
+					if(ret < 0)
+					{
+						err = errno;
+						if(err == EINTR)
+						{
+							continue;
+						}
+						syslog( LOG_ERR,
+						        "Error reading python stdout : %s",
+							strerror(err));
+						exit(err);
+					}
+					buf[ret] = '\0';
+					printf("%s", buf);
+					break;
+				}
+			}
+			//TODO handle other poll events
+		}
+		if(poll_ret && (revents = fds[1].revents))
+		{
+			syslog(LOG_DEBUG, "Worker[%d] req #%d STDERR evt !",
+			       wrk_id, req_id);
+			if(revents & POLLIN)
+			{
+				syslog(LOG_DEBUG, "Worker[%d] req #%d POLLIN STDERR !",
+				       wrk_id, req_id);
+				while(1)
+				{
+					ret = read(pystderr, buf, PIPE_BUF);
+					if(ret < 0)
+					{
+						err = errno;
+						if(err == EINTR)
+						{
+							continue;
+						}
+						syslog( LOG_ERR,
+						        "Error reading python stdout : %s",
+							strerror(err));
+						exit(err);
+					}
+					buf[ret] = '\0';
+					syslog(LOG_ERR,
+					       "Worker[%d] Python error : %s",
+					       wrk_id, buf);
+					break;
+				}
+			}
+			//TODO handle other poll events
+		}
+		fds[0].revents = fds[1].revents = 0;
+	}
+	syslog(LOG_DEBUG, "Worker[%d] req #%d piper exiting...",
+	       wrk_id, req_id);
+	exit(0);
+}
+
+void worker_piper_sighandler(int signum)
+{
+	worker_piper_sigrcv = 1;
+	syslog(LOG_DEBUG, "SIG");
+}
+
+PyObject* import_entrypoint(char* py_entrypoint)
+{
+	PyObject *entry_fname, *entry_module, *entry_fun;
+	entry_fname = PyUnicode_DecodeFSDefault(py_entrypoint);
+	entry_module = PyImport_Import(entry_fname);
+	Py_DECREF(entry_fname);
+
+	if(!entry_module)
+	{
+		//TODO syslog python error / traceback
+		syslog(	LOG_CRIT,
+			"Unable to import python file '%s'",
+			py_entrypoint);
+		syslog( LOG_INFO,
+			"%s", getcwd(NULL, 256));
+		log_expt(LOG_ERR);
+		sleep(1);
+		Py_Exit(1);
+	}
+
+	// getting entrypoint function
+	entry_fun = PyObject_GetAttrString(entry_module, PYENTRY_FUNNAME);
+	Py_DECREF(entry_module);
+
+	if(!entry_fun)
+	{
+		//TODO syslog python error / traceback
+		syslog(	LOG_CRIT,
+			"Unable to import object '%s' from '%s'",
+			PYENTRY_FUNNAME, py_entrypoint);
+		Py_Exit(2);
+	}
+	if(!PyCallable_Check(entry_fun))
+	{
+		syslog( LOG_CRIT,
+			"When imported from '%s', '%s' was not a callable",
+			py_entrypoint, PYENTRY_FUNNAME);
+		Py_Exit(3);
+	}
+	return entry_fun;
+}
+
+void update_python_path()
+{
+	wchar_t *ppath, *wcwd, *wtmp;
+	char *cwd, *ncwd, *err_fmt;
+	size_t wcwd_sz, ppath_sz;
+	int err;
+	
+	// Add a ':' in front of CWD and convert to wchar_t*
+	cwd = get_current_dir_name();
+	if(!cwd)
+	{
+		err = errno;
+		err_fmt = "Unable to fecth CWD : %s";
+		goto update_python_path_err;
+	}
+	ncwd = malloc(sizeof(char) * (strlen(cwd) + 2));
+	if(!ncwd)
+	{
+		err = errno;
+		err_fmt = "Unable to allocate memory for new CWD : %s";
+		goto update_python_path_err_cwd;
+	}
+	ncwd[0] = ':';
+	strcpy(ncwd+1, cwd);
+	free(cwd);
+	cwd = ncwd;
+
+	wcwd_sz = mbstowcs(NULL, cwd, 0);
+	if(wcwd_sz == (size_t)-1)
+	{
+		err = errno;
+		err_fmt = "Unable to convert CWD to wchar : %s";
+		goto update_python_path_err_cwd;
+	}
+	wcwd_sz++;
+	wcwd = malloc(sizeof(wchar_t) * wcwd_sz);
+	if(!wcwd)
+	{
+		err = errno;
+		err_fmt = "Unable to allocate wchar for CWD : %s";
+		goto update_python_path_err_cwd;
+
+	}
+	if(mbstowcs(wcwd, cwd, wcwd_sz) == -1)
+	{
+		err = errno;
+		err_fmt = "Unable to convert CWD to wchar : %s";
+		goto update_python_path_err_wcwd;
+	}
+
+	// Fetch, dup & update the python path
+	ppath = Py_GetPath();
+	if(!ppath)
+	{
+		if(PyErr_Occurred())
+		{
+			log_expt(LOG_ALERT);
+		}
+		else
+		{
+			syslog(LOG_ALERT, "Unable to fetch python path, got NULL.");
+		}
+		err_fmt = NULL;
+		goto update_python_path_err_wcwd;
+	}
+	ppath = wcsdup(ppath);
+	if(!wcwd)
+	{
+		err = errno;
+		err_fmt = "Unable to dup the python PATH : %s";
+		goto update_python_path_err_wcwd;
+	}
+
+	ppath_sz = wcslen(ppath);
+	wtmp = realloc(ppath, sizeof(wchar_t) * (ppath_sz + wcwd_sz + 1));
+	if(!wtmp)
+	{
+		err = errno;
+		err_fmt = "Unable reallocate new python path : %s";
+		goto update_python_path_err_ppath;
+	}
+	ppath = wtmp;
+	wcsncpy(ppath+ppath_sz, wcwd, wcwd_sz);
+	Py_SetPath(ppath);
+
+	free(ppath);
+	free(wcwd);
+	free(cwd);
+
+	return;
+	
+update_python_path_err_ppath:
+	free(ppath);
+update_python_path_err_wcwd:
+	free(wcwd);
+update_python_path_err_cwd:
+	free(cwd);
+update_python_path_err:
+	if(err_fmt)
+	{
+		syslog( LOG_ALERT, err_fmt, strerror(err));
+	}
+	exit(err);
+}
+
+void update_python_fd(int pipe_out[2], int pipe_err[2])
+{
+	int pri, err;
+	char *err_fmt;
+	PyObject *os_mod, *pyfdopen, *args, *new_fd;
+
+	pri = LOG_ALERT;
+
+	if(pipe2(pipe_out, O_DIRECT) == -1)
+	{
+		err = errno;
+		err_fmt = "Unable to create pipe for python stdout : %s";
+		goto update_python_fd_err;
+	}
+	if(pipe2(pipe_err, O_DIRECT) == -1)
+	{
+		err = errno;
+		err_fmt = "Unable to create pipe for python stderr : %s";
+		goto update_python_fd_err_pipeout;
+	}
+
+	os_mod = PyImport_ImportModule("os");
+	if(!os_mod)
+	{
+		if(PyErr_Occurred())
+		{
+			log_expt(LOG_ALERT);
+		}
+		else
+		{
+			syslog(	LOG_ALERT,
+				"Unable to import python os module, got NULL.");
+		}
+		err_fmt = NULL;
+		goto update_python_fd_err_pipes;
+	}
+	pyfdopen = PyObject_GetAttrString(os_mod, "fdopen");
+	Py_DECREF(os_mod);
+	if(!pyfdopen)
+	{
+		if(PyErr_Occurred())
+		{
+			log_expt(LOG_ALERT);
+		}
+		else
+		{
+			syslog(	LOG_ALERT,
+				"Unable to fetch os.fdopen() , got NULL.");
+		}
+		err_fmt = NULL;
+		Py_DECREF(os_mod);
+		goto update_python_fd_err_pipes;
+	}
+
+	args = Py_BuildValue("is", pipe_out[1], "w");
+	if(!args)
+	{
+		syslog(	LOG_ERR, "Error building values with '%d', '%s' for stdout",
+			pipe_out[1], "w");
+		log_expt(LOG_ALERT);
+		err_fmt = NULL;
+		goto update_python_fd_err_fdopen;
+	}
+	new_fd = PyObject_CallObject(pyfdopen, args);
+	if(!new_fd || PyErr_Occurred())
+	{
+		syslog(	LOG_ERR, "Error calling fdopen(%d, '%s')",
+			pipe_out[1], "w");
+		log_expt(LOG_ALERT);
+		err_fmt = NULL;
+		goto update_python_fd_err_args;
+	}
+	Py_DECREF(args);
+	if(PySys_SetObject("stdout", new_fd))
+	{
+		syslog(LOG_ERR, "Unable to set sys.stdout");
+		log_expt(LOG_ALERT);
+		goto update_python_fd_err_newfd;
+	}
+	Py_DECREF(new_fd);
+
+	args = Py_BuildValue("is", pipe_err[1], "w");
+	if(!args)
+	{
+		syslog(	LOG_ERR, "Error building values with '%d', '%s' for stderr",
+			pipe_out[1], "w");
+		log_expt(LOG_ALERT);
+		err_fmt = NULL;
+		goto update_python_fd_err_fdopen;
+	}
+	new_fd = PyObject_CallObject(pyfdopen, args);
+	if(!new_fd || PyErr_Occurred())
+	{
+		syslog(	LOG_ERR, "Error calling fdopen(%d, '%s')",
+			pipe_out[1], "w");
+		log_expt(LOG_ALERT);
+		err_fmt = NULL;
+		goto update_python_fd_err_args;
+	}
+	Py_DECREF(args);
+	if(PySys_SetObject("stderr", new_fd))
+	{
+		syslog(LOG_ERR, "Unable to set sys.stderr");
+		log_expt(LOG_ALERT);
+		goto update_python_fd_err_newfd;
+	}
+	Py_DECREF(new_fd);
+
+	return;
+
+update_python_fd_err_newfd:
+	Py_DECREF(new_fd);
+update_python_fd_err_args:
+	Py_DECREF(args);
+update_python_fd_err_fdopen:
+	Py_DECREF(fdopen);
+update_python_fd_err_pipes:
+	close(pipe_err[0]);
+	close(pipe_err[1]);
+update_python_fd_err_pipeout:
+	close(pipe_out[0]);
+	close(pipe_out[1]);
+update_python_fd_err:
+	if(err_fmt)
+	{
+		syslog(pri, err_fmt, strerror(err));
+	}
+	exit(1);
+}
+
+void log_expt(int priority)
+{
+	if(!PyErr_Occurred())
+	{
+		syslog(priority, "No exception");
+		return;
+	}
+
+	PyObject *expt, *expt_str, *expt_bytes, *expt_cls,
+		*expt_val, *expt_type, *traceback;
+	char *msg, *type, *val;
+	int msg_sz;
+	char msg_fmt[] = "%s: %s";
+
+	PyErr_Fetch(&expt_cls, &expt, &traceback);
+
+	// Fetching exception message using __str__()
+	expt_str = PyObject_GetAttrString(expt, "__str__");
+	if(!expt_str)
+	{
+		syslog(LOG_ERR, "Unable to fetch __str__ from exception");
+	}
+	expt_val = PyObject_CallObject(expt_str, NULL);
+	expt_bytes = PyUnicode_AsUTF8String(expt_val);
+
+	msg = PyBytes_AsString(expt_bytes);
+	val = strndup(msg, 1024); // TODO check out of mem if !val
+
+	// Fetching exception class name
+	expt_type = PyObject_GetAttrString(expt_cls, "__name__");
+	expt_bytes = PyUnicode_AsUTF8String(expt_type);
+	msg = PyBytes_AsString(expt_bytes);
+	type = strndup(msg, 1024); // TODO check out of mem if !type
+
+	msg_sz = snprintf(NULL, 0, msg_fmt, type, val);
+	msg_sz++;
+	msg = malloc(sizeof(char) * msg_sz);
+	snprintf(msg, msg_sz, msg_fmt, type, val);
+
+	syslog(priority, msg);
+}

src/pyworker.h

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2019 Weber Yann
+ * 
+ * This file is part of PyFCGI.
+ * 
+ * PyFCGI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ * 
+ * PyFCGI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with PyFCGI.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _PYWORKER__H___
+#define _PYWORKER__H___
+
+#include "config.h"
+
+#include <fcgi_stdio.h> /* fcgi library; put it first*/
+
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <syslog.h>
+#include <signal.h>
+#include <limits.h>
+#include <poll.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#define EXIT_PYERR 42
+#define WPIPER_SIG 30
+#define PYENTRY_FUNNAME "entrypoint"
+
+typedef unsigned long int pywrkid_t;
+
+/**@brief Spawn a worker given an entrypoint
+ *
+ * Spawn a new worker process and prepare ENV & request forwarding
+ * @param char* python_entrypoint a path to a python entrypoint
+ * @param int worker uid
+ * @param int semid for FCGI access
+ * @param int max request before worker restart
+ * @return child PID
+ */
+pid_t spawn(char*, int, int, int);
+
+/**@brief the function that initialize the python worker
+ * @param char* python_entrypoint a path to a python entrypoint
+ * @param int worker uid
+ * @param int semid for FCGI access
+ * @param int max request before worker restart
+ * @return 0 if exit avec max requests
+ */
+int work(char*, int, int, int);
+
+/**@brief function for a subprocess designed to read stdin & stdout from
+ * python & forward them to syslog or FCGI
+ * @param int worker id
+ * @param int request id
+ * @param int pystdout
+ * @param int pystderr
+ * @param int ctlpipe a pipe closed when the process is ready
+ * @note Exit after signal sent by parent & when poll indicate the pipes are
+ * empty
+ */
+void worker_piper(int, int, int, int, int);
+
+/**@brief worker piper sigaction handler
+ */
+void worker_piper_sighandler(int);
+
+/**@brief Import & return the python entrypoint callable
+ */
+PyObject* import_entrypoint(char* py_entrypoint);
+
+/**@brief Add . to the embed pythonpath
+ */
+void update_python_path();
+
+/**@brief Create two pipes for stdout & stderr
+ * @params int[2] pystdout
+ * @params int[2] pystderr
+ */
+void update_python_fd(int[2], int[2]);
+
+void log_expt(int priority);
+
+#endif

src/responder.c

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2019 Weber Yann
+ * 
+ * This file is part of PyFCGI.
+ * 
+ * PyFCGI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ * 
+ * PyFCGI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with PyFCGI.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "responder.h"
+int pyfcgi_semid = 0;
+
+void init_context()
+{
+	pyfcgi_semid = 0;
+}
+
+
+int responder_loop(char *py_entrypoint, unsigned int max_reqs,
+	unsigned int min_wrk, unsigned int max_wrk)
+{
+	unsigned int n_wrk;
+	int *wrk_pids;
+	int semid, err;
+
+	syslog(LOG_INFO, "Preparing workers");
+
+	init_context();
+
+	wrk_pids = malloc(sizeof(int) * max_wrk);
+	if(!wrk_pids)
+	{
+		err = errno;
+		syslog(	LOG_ALERT,
+			"Unable to allocate memory for childs PID : %s",
+			strerror(err));
+		clean_exit(err);
+	}
+	bzero(wrk_pids, sizeof(int) * max_wrk);
+
+	semid = new_semaphore();
+	
+	for(n_wrk=0; n_wrk != min_wrk; n_wrk++)
+	{
+		wrk_pids[n_wrk] = spawn(py_entrypoint, n_wrk, semid, max_reqs);
+	}
+	
+	//Debug wait & exit
+	for(n_wrk=0; n_wrk != min_wrk; n_wrk++)
+	{
+		wait(NULL);
+	}
+		//printf("Content-Type: text/html\r\n\r\nHello world !\n");
+	return 0;
+}
+
+
+int new_semaphore(key_t semkey)
+{
+	int semid, err;
+
+	semid = semget(IPC_PRIVATE, 2, 0770);
+
+	if(semid == -1)
+	{
+		err = errno;
+		syslog(	LOG_ALERT,
+			"Unable to create semaphore : %s",
+			strerror(err));
+		clean_exit(err);
+	}
+	if(pyfcgi_semid)
+	{
+		syslog(	LOG_WARNING,
+			"The semid context was not zero when calling new_semaphore, attempt to closeing it.");
+		semctl(pyfcgi_semid, 0, IPC_RMID);
+
+	}
+	pyfcgi_semid = semid;
+	return semid;
+}
+
+void clean_exit(int status)
+{
+	if(pyfcgi_semid && semctl(pyfcgi_semid, 0, IPC_RMID) == -1)
+	{
+		syslog(	LOG_CRIT,
+			"Unable to delete semaphore before exiting.");
+	}
+	exit(status);
+}

src/responder.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2019 Weber Yann
+ * 
+ * This file is part of PyFCGI.
+ * 
+ * PyFCGI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * any later version.
+ * 
+ * PyFCGI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with PyFCGI.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _RESPONDER__H___
+#define _RESPONDER__H___
+
+#include <fcgi_stdio.h> /* fcgi library; put it first*/
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <syslog.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+
+#include "pyworker.h"
+
+
+extern int pyfcgi_semid;
+
+void init_context();
+
+/**@brief The responder loop
+ *
+ * The main function of the fcgi app fork child
+ * @param int max_requests : exit normally after this number of requests. If
+ * 0 given never exit.
+ * @param char* python_entrypoint a path to a python entrypoint
+ * @param unsigned int max_requests before exiting worker
+ * @param unsigned int minimum workers count
+ * @param unsigned int maximum wrokers count
+ * @return 0 on success
+ */
+int responder_loop(char *py_entrypoint, unsigned int max_reqs,
+	unsigned int min_wrk, unsigned int max_wrk);
+
+/**@brief Generate a new semaphore from given key
+ * @note set pyfcgi_semid
+ * @return int semid
+ */
+int new_semaphore();
+
+/**@brief Exit after closing all stuff like semaphores
+ */
+void clean_exit(int);
+
+#endif