KHTTP_FCGI_INIT(3)

NAME
khttp_fcgi_init, khttp_fcgi_initx - initialise a FastCGI context for kcgi

LIBRARY
libkcgi

SYNOPSIS
#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, preferrably 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.

SEE ALSO
kcgi(3), khttp_fcgi_free(3), khttp_fcgi_parse(3), khttp_parse(3)

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