NAME

khttp_fcgi_init, khttp_fcgi_initx —

initialise a FastCGI context for kcgi

LIBRARY

library “libkcgi”

SYNOPSIS

#include <sys/types.h>
#include <stdarg.h>
#include <stdint.h>
#include <kcgi.h>

enum kcgi_err
khttp_fcgi_init(struct kfcgi **fcgi, const struct kvalid *keys, size_t keysz, const char *const *pages, size_t pagesz, size_t defpage);

enum kcgi_err
khttp_fcgi_initx(struct kreq **fcgi, const char *const *mimes, size_t mimemax, const struct kvalid *keys, size_t keysz, const struct kmimemap *mimemap, size_t defmime, const char *const *pages, size_t pagesz, size_t defpage, void *arg, void (*argfree)(void *arg), unsigned int debugging, const struct kopts *opts);

DESCRIPTION

The khttp_fcgi_init() and khttp_fcgi_initx() functions initialise a FastCGI context for kcgi(3). These functions will only work if invoked as FastCGI servers, for example, kfcgi(8). They should be called as early as possible in the life-span of a FastCGI application, preferably directly after initialisation.

The collective arguments are defined in khttp_parse(3). Function arguments are not copied: all pointers are passed by reference and used in later invocations of khttp_fcgi_parse(3).

The first form, khttp_fgci_init(), is for applications using the system-recognised MIME types. This should work well enough for most applications. It is equivalent to invoking the second form, khttp_fcgi_initx(), as follows:

khttp_fcgi_initx(fcgi, kmimetypes, KMIME__MAX,
  keys, keysz, ksuffixmap, KMIME_TEXT_HTML,
  pages, pagesz, defpage, NULL, NULL, 0, NULL);

After invocation with a return value of KCGI_OK, the fcgi pointer is filled in (and must be later be freed with khttp_fcgi_free(3)) and the khttp_fcgi_parse(3) and khttp_fcgi_parsex(3) functions may be invoked.

Note: in accordance with the FastCGI specification, khttp_fcgi_init() and khttp_fcgi_initx() will install signal handlers for SIGTERM. These should not be changed by the calling application, but are not prohibited from doing so. The consequences are that a server wishing to halt the application must use SIGKILL instead of the FastCGI-specified SIGTERM and suffer the consequences of not properly exiting the parse loop.

RETURN VALUES

khttp_fcgi_init() and khttp_fcgi_initx() return an error code:

KCGI_OK: Success (not an error).
KCGI_ENOMEM: Memory failure. This can occur in many places: spawning a child, allocating memory, creating sockets, etc.
KCGI_ENFILE: Could not allocate file descriptors.
KCGI_EAGAIN: Could not spawn a child.
KCGI_SYSTEM: Opaque operating system error.
KCGI_HUP: Hangup: the function was not invoked in a FastCGI context.

On failure, the calling application should terminate as soon as possible.

AUTHORS

The khttp_fcgi_init() and khttp_fcgi_initx() functions were written by Kristaps Dzonsons <kristaps@bsd.lv>.