ngx_rtmp_exec_module.c

/*
 * Copyright (C) Roman Arutyunyan
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp_cmd_module.h"
#include "ngx_rtmp_eval.h"
#include "ngx_poold.h"
#include <stdlib.h>

#ifdef NGX_LINUX
#include <unistd.h>
#endif


#if !(NGX_WIN32)
static ngx_rtmp_publish_pt              next_publish;
static ngx_rtmp_play_pt                 next_play;
static ngx_rtmp_close_stream_pt         next_close_stream;
#endif


static ngx_int_t ngx_rtmp_exec_init_process(ngx_cycle_t *cycle);
static ngx_int_t ngx_rtmp_exec_postconfiguration(ngx_conf_t *cf);
static void * ngx_rtmp_exec_create_main_conf(ngx_conf_t *cf);
static char * ngx_rtmp_exec_init_main_conf(ngx_conf_t *cf, void *conf);
static void * ngx_rtmp_exec_create_app_conf(ngx_conf_t *cf);
static char * ngx_rtmp_exec_merge_app_conf(ngx_conf_t *cf,
       void *parent, void *child);
/*static char * ngx_rtmp_exec_block(ngx_conf_t *cf, ngx_command_t *cmd,
       void *conf);*/
static char * ngx_rtmp_exec_conf(ngx_conf_t *cf, ngx_command_t *cmd,
       void *conf);
static char *ngx_rtmp_exec_kill_signal(ngx_conf_t *cf, ngx_command_t *cmd,
       void *conf);


#define NGX_RTMP_EXEC_RESPAWN           0x01
#define NGX_RTMP_EXEC_KILL              0x02


#define NGX_RTMP_EXEC_PUBLISHING        0x01
#define NGX_RTMP_EXEC_PLAYING           0x02


enum {
    NGX_RTMP_EXEC_PUSH,
    NGX_RTMP_EXEC_PULL,

    NGX_RTMP_EXEC_PUBLISH,
    NGX_RTMP_EXEC_PUBLISH_DONE,
    NGX_RTMP_EXEC_PLAY,
    NGX_RTMP_EXEC_PLAY_DONE,
    NGX_RTMP_EXEC_RECORD_DONE,

    NGX_RTMP_EXEC_MAX,

    NGX_RTMP_EXEC_STATIC
};


typedef struct {
    ngx_str_t                           id;
    ngx_uint_t                          type;
    ngx_str_t                           cmd;
    ngx_array_t                         args;       /* ngx_str_t */
    ngx_array_t                         names;
} ngx_rtmp_exec_conf_t;


typedef struct {
    ngx_rtmp_exec_conf_t               *conf;
    ngx_log_t                          *log;
    ngx_rtmp_eval_t                   **eval;
    void                               *eval_ctx;
    unsigned                            active:1;
    unsigned                            managed:1;
    ngx_pid_t                           pid;
    ngx_pid_t                          *save_pid;
    int                                 pipefd;
    ngx_connection_t                    dummy_conn;  /*needed by ngx_xxx_event*/
    ngx_event_t                         read_evt, write_evt;
    ngx_event_t                         respawn_evt;
    ngx_msec_t                          respawn_timeout;
    ngx_int_t                           kill_signal;
} ngx_rtmp_exec_t;


typedef struct {
    ngx_array_t                         static_conf; /* ngx_rtmp_exec_conf_t */
    ngx_array_t                         static_exec; /* ngx_rtmp_exec_t */
    ngx_msec_t                          respawn_timeout;
    ngx_int_t                           kill_signal;
    ngx_log_t                          *log;
} ngx_rtmp_exec_main_conf_t;


typedef struct ngx_rtmp_exec_pull_ctx_s  ngx_rtmp_exec_pull_ctx_t;

struct ngx_rtmp_exec_pull_ctx_s {
    ngx_pool_t                         *pool;
    ngx_uint_t                          counter;
    ngx_str_t                           name;
    ngx_str_t                           app;
    ngx_array_t                         pull_exec;   /* ngx_rtmp_exec_t */
    ngx_rtmp_exec_pull_ctx_t           *next;
};


typedef struct {
    ngx_int_t                           active;
    ngx_array_t                         conf[NGX_RTMP_EXEC_MAX];
                                                     /* ngx_rtmp_exec_conf_t */
    ngx_flag_t                          respawn;
    ngx_flag_t                          options;
    ngx_uint_t                          nbuckets;
    ngx_rtmp_exec_pull_ctx_t          **pull;
} ngx_rtmp_exec_app_conf_t;


typedef struct {
    ngx_uint_t                          flags;
    ngx_str_t                           path;     /* /tmp/rec/myfile-123.flv */
    ngx_str_t                           filename; /* myfile-123.flv */
    ngx_str_t                           basename; /* myfile-123 */
    ngx_str_t                           dirname;  /* /tmp/rec */
    ngx_str_t                           recorder;
    u_char                              name[NGX_RTMP_MAX_NAME];
    u_char                              args[NGX_RTMP_MAX_ARGS];
    ngx_array_t                         push_exec;   /* ngx_rtmp_exec_t */
    ngx_rtmp_exec_pull_ctx_t           *pull;
} ngx_rtmp_exec_ctx_t;


#if !(NGX_WIN32)
static void ngx_rtmp_exec_respawn(ngx_event_t *ev);
static ngx_int_t ngx_rtmp_exec_kill(ngx_rtmp_exec_t *e, ngx_int_t kill_signal);
static ngx_int_t ngx_rtmp_exec_run(ngx_rtmp_exec_t *e);
#endif


static ngx_command_t  ngx_rtmp_exec_commands[] = {
/*
    { ngx_string("exec_block"),
      NGX_RTMP_APP_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS|NGX_CONF_TAKE1,
      ngx_rtmp_exec_block,
      NGX_RTMP_APP_CONF_OFFSET,
      0,
      NULL },
*/
    { ngx_string("exec"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, conf) +
      NGX_RTMP_EXEC_PUSH * sizeof(ngx_array_t),
      NULL },

    { ngx_string("exec_push"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, conf) +
      NGX_RTMP_EXEC_PUSH * sizeof(ngx_array_t),
      NULL },

    { ngx_string("exec_pull"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, conf) +
      NGX_RTMP_EXEC_PULL * sizeof(ngx_array_t),
      NULL },

    { ngx_string("exec_publish"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, conf) +
      NGX_RTMP_EXEC_PUBLISH * sizeof(ngx_array_t),
      NULL },

    { ngx_string("exec_publish_done"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, conf) +
      NGX_RTMP_EXEC_PUBLISH_DONE * sizeof(ngx_array_t),
      NULL },

    { ngx_string("exec_play"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, conf) +
      NGX_RTMP_EXEC_PLAY * sizeof(ngx_array_t),
      NULL },

    { ngx_string("exec_play_done"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, conf) +
      NGX_RTMP_EXEC_PLAY_DONE * sizeof(ngx_array_t),
      NULL },

    { ngx_string("exec_record_done"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_RTMP_REC_CONF|
                         NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, conf) +
      NGX_RTMP_EXEC_RECORD_DONE * sizeof(ngx_array_t),
      NULL },

    { ngx_string("exec_static"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
      ngx_rtmp_exec_conf,
      NGX_RTMP_MAIN_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_main_conf_t, static_conf),
      NULL },

    { ngx_string("respawn"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_flag_slot,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, respawn),
      NULL },

    { ngx_string("respawn_timeout"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_msec_slot,
      NGX_RTMP_MAIN_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_main_conf_t, respawn_timeout),
      NULL },

    { ngx_string("exec_kill_signal"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
      ngx_rtmp_exec_kill_signal,
      NGX_RTMP_MAIN_CONF_OFFSET,
      0,
      NULL },

    { ngx_string("exec_options"),
      NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
      ngx_conf_set_flag_slot,
      NGX_RTMP_APP_CONF_OFFSET,
      offsetof(ngx_rtmp_exec_app_conf_t, options),
      NULL },

      ngx_null_command
};


static ngx_rtmp_module_t  ngx_rtmp_exec_module_ctx = {
    NULL,                                   /* preconfiguration */
    ngx_rtmp_exec_postconfiguration,        /* postconfiguration */
    ngx_rtmp_exec_create_main_conf,         /* create main configuration */
    ngx_rtmp_exec_init_main_conf,           /* init main configuration */
    NULL,                                   /* create server configuration */
    NULL,                                   /* merge server configuration */
    ngx_rtmp_exec_create_app_conf,          /* create app configuration */
    ngx_rtmp_exec_merge_app_conf            /* merge app configuration */
};


ngx_module_t  ngx_rtmp_exec_module = {
    NGX_MODULE_V1,
    &ngx_rtmp_exec_module_ctx,              /* module context */
    ngx_rtmp_exec_commands,                 /* module directives */
    NGX_RTMP_MODULE,                        /* module type */
    NULL,                                   /* init master */
    NULL,                                   /* init module */
    ngx_rtmp_exec_init_process,             /* init process */
    NULL,                                   /* init thread */
    NULL,                                   /* exit thread */
    NULL,                                   /* exit process */
    NULL,                                   /* exit master */
    NGX_MODULE_V1_PADDING
};


static void
ngx_rtmp_exec_eval_ctx_cstr(void *sctx, ngx_rtmp_eval_t *e, ngx_str_t *ret)
{
    ngx_rtmp_session_t  *s = sctx;

    ngx_rtmp_exec_ctx_t  *ctx;

    ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
    if (ctx == NULL) {
        ret->len = 0;
        return;
    }

    ret->data = (u_char *) ctx + e->offset;
    ret->len = ngx_strlen(ret->data);
}


static void
ngx_rtmp_exec_eval_ctx_str(void *sctx, ngx_rtmp_eval_t *e, ngx_str_t *ret)
{
    ngx_rtmp_session_t  *s = sctx;

    ngx_rtmp_exec_ctx_t  *ctx;

    ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
    if (ctx == NULL) {
        ret->len = 0;
        return;
    }

    *ret = * (ngx_str_t *) ((u_char *) ctx + e->offset);
}


static void
ngx_rtmp_exec_eval_pctx_str(void *ctx, ngx_rtmp_eval_t *e, ngx_str_t *ret)
{
    *ret = *(ngx_str_t *) ((u_char *) ctx + e->offset);
}


static ngx_rtmp_eval_t ngx_rtmp_exec_push_specific_eval[] = {

    { ngx_string("name"),
      ngx_rtmp_exec_eval_ctx_cstr,
      offsetof(ngx_rtmp_exec_ctx_t, name) },

    { ngx_string("args"),
      ngx_rtmp_exec_eval_ctx_cstr,
      offsetof(ngx_rtmp_exec_ctx_t, args) },

    ngx_rtmp_null_eval
};


static ngx_rtmp_eval_t * ngx_rtmp_exec_push_eval[] = {
    ngx_rtmp_eval_session,
    ngx_rtmp_exec_push_specific_eval,
    NULL
};


static ngx_rtmp_eval_t ngx_rtmp_exec_pull_specific_eval[] = {

    { ngx_string("name"),
      ngx_rtmp_exec_eval_pctx_str,
      offsetof(ngx_rtmp_exec_pull_ctx_t, name) },

    { ngx_string("app"),
      ngx_rtmp_exec_eval_pctx_str,
      offsetof(ngx_rtmp_exec_pull_ctx_t, app) },

    ngx_rtmp_null_eval
};


static ngx_rtmp_eval_t * ngx_rtmp_exec_pull_eval[] = {
    ngx_rtmp_exec_pull_specific_eval,
    NULL
};


static ngx_rtmp_eval_t ngx_rtmp_exec_event_specific_eval[] = {

    { ngx_string("name"),
      ngx_rtmp_exec_eval_ctx_cstr,
      offsetof(ngx_rtmp_exec_ctx_t, name) },

    { ngx_string("args"),
      ngx_rtmp_exec_eval_ctx_cstr,
      offsetof(ngx_rtmp_exec_ctx_t, args) },

    { ngx_string("path"),
      ngx_rtmp_exec_eval_ctx_str,
      offsetof(ngx_rtmp_exec_ctx_t, path) },

    { ngx_string("filename"),
      ngx_rtmp_exec_eval_ctx_str,
      offsetof(ngx_rtmp_exec_ctx_t, filename) },

    { ngx_string("basename"),
      ngx_rtmp_exec_eval_ctx_str,
      offsetof(ngx_rtmp_exec_ctx_t, basename) },

    { ngx_string("dirname"),
      ngx_rtmp_exec_eval_ctx_str,
      offsetof(ngx_rtmp_exec_ctx_t, dirname) },

    { ngx_string("recorder"),
      ngx_rtmp_exec_eval_ctx_str,
      offsetof(ngx_rtmp_exec_ctx_t, recorder) },

    ngx_rtmp_null_eval
};


static ngx_rtmp_eval_t * ngx_rtmp_exec_event_eval[] = {
    ngx_rtmp_eval_session,
    ngx_rtmp_exec_event_specific_eval,
    NULL
};


static void *
ngx_rtmp_exec_create_main_conf(ngx_conf_t *cf)
{
    ngx_rtmp_exec_main_conf_t     *emcf;

    emcf = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_exec_main_conf_t));
    if (emcf == NULL) {
        return NULL;
    }

    emcf->respawn_timeout = NGX_CONF_UNSET_MSEC;
    emcf->kill_signal = NGX_CONF_UNSET;

    if (ngx_array_init(&emcf->static_conf, cf->pool, 1,
                       sizeof(ngx_rtmp_exec_conf_t)) != NGX_OK)
    {
        return NULL;
    }

    return emcf;
}


static char *
ngx_rtmp_exec_init_main_conf(ngx_conf_t *cf, void *conf)
{
    ngx_rtmp_exec_main_conf_t  *emcf = conf;
    ngx_rtmp_exec_conf_t       *ec;
    ngx_rtmp_exec_t            *e;
    ngx_uint_t                  n;

    if (emcf->respawn_timeout == NGX_CONF_UNSET_MSEC) {
        emcf->respawn_timeout = 5000;
    }

#if !(NGX_WIN32)
    if (emcf->kill_signal == NGX_CONF_UNSET) {
        emcf->kill_signal = SIGKILL;
    }
#endif

    if (ngx_array_init(&emcf->static_exec, cf->pool,
                       emcf->static_conf.nelts,
                       sizeof(ngx_rtmp_exec_t)) != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    e = ngx_array_push_n(&emcf->static_exec, emcf->static_conf.nelts);
    if (e == NULL) {
        return NGX_CONF_ERROR;
    }

    emcf->log = &cf->cycle->new_log;

    ec = emcf->static_conf.elts;

    for (n = 0; n < emcf->static_conf.nelts; n++, e++, ec++) {
        ngx_memzero(e, sizeof(*e));
        e->conf = ec;
        e->managed = 1;
        e->log = emcf->log;
        e->respawn_timeout = emcf->respawn_timeout;
        e->kill_signal = emcf->kill_signal;
    }

    return NGX_CONF_OK;
}


static void *
ngx_rtmp_exec_create_app_conf(ngx_conf_t *cf)
{
    ngx_rtmp_exec_app_conf_t      *eacf;

    eacf = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_exec_app_conf_t));
    if (eacf == NULL) {
        return NULL;
    }

    eacf->respawn = NGX_CONF_UNSET;
    eacf->options = NGX_CONF_UNSET;
    eacf->nbuckets = NGX_CONF_UNSET_UINT;

    return eacf;
}


static ngx_int_t
ngx_rtmp_exec_merge_confs(ngx_array_t *conf, ngx_array_t *prev)
{
    size_t                 n;
    ngx_rtmp_exec_conf_t  *ec, *pec;

    if (prev->nelts == 0) {
        return NGX_OK;
    }

    if (conf->nelts == 0) {
        *conf = *prev;
        return NGX_OK;
    }

    ec = ngx_array_push_n(conf, prev->nelts);
    if (ec == NULL) {
        return NGX_ERROR;
    }

    pec = prev->elts;
    for (n = 0; n < prev->nelts; n++, ec++, pec++) {
        *ec = *pec;
    }

    return NGX_OK;
}


static char *
ngx_rtmp_exec_merge_app_conf(ngx_conf_t *cf, void *parent, void *child)
{
    ngx_rtmp_exec_app_conf_t   *prev = parent;
    ngx_rtmp_exec_app_conf_t   *conf = child;

    ngx_uint_t  n;

    ngx_conf_merge_value(conf->respawn, prev->respawn, 1);
    ngx_conf_merge_uint_value(conf->nbuckets, prev->nbuckets, 1024);

    for (n = 0; n < NGX_RTMP_EXEC_MAX; n++) {
        if (ngx_rtmp_exec_merge_confs(&conf->conf[n], &prev->conf[n]) != NGX_OK)
        {
            return NGX_CONF_ERROR;
        }

        if (conf->conf[n].nelts) {
            conf->active = 1;
            prev->active = 1;
        }
    }

    if (conf->conf[NGX_RTMP_EXEC_PULL].nelts > 0) {
        conf->pull = ngx_pcalloc(cf->pool, sizeof(void *) * conf->nbuckets);
        if (conf->pull == NULL) {
            return NGX_CONF_ERROR;
        }
    }

    return NGX_CONF_OK;
}


static ngx_int_t
ngx_rtmp_exec_init_process(ngx_cycle_t *cycle)
{
#if !(NGX_WIN32)
    ngx_rtmp_core_main_conf_t  *cmcf = ngx_rtmp_core_main_conf;
    ngx_rtmp_core_srv_conf_t  **cscf;
    ngx_rtmp_conf_ctx_t        *cctx;
    ngx_rtmp_exec_main_conf_t  *emcf;
    ngx_rtmp_exec_t            *e;
    ngx_uint_t                  n;

    if (cmcf == NULL || cmcf->servers.nelts == 0) {
        return NGX_OK;
    }

    /* execs are always started by the first worker */
    if (ngx_process_slot) {
        return NGX_OK;
    }

    cscf = cmcf->servers.elts;
    cctx = (*cscf)->ctx;
    emcf = cctx->main_conf[ngx_rtmp_exec_module.ctx_index];

    /* FreeBSD note:
     * When worker is restarted, child process (ffmpeg) will
     * not be terminated if it's connected to another
     * (still alive) worker. That leads to starting
     * another instance of exec_static process.
     * Need to kill previously started processes.
     *
     * On Linux "prctl" syscall is used to kill child
     * when nginx worker is terminated.
     */

    e = emcf->static_exec.elts;
    for (n = 0; n < emcf->static_exec.nelts; ++n, ++e) {
        e->respawn_evt.data = e;
        e->respawn_evt.log = e->log;
        e->respawn_evt.handler = ngx_rtmp_exec_respawn;
        ngx_post_event((&e->respawn_evt), &ngx_rtmp_init_queue);
    }
#endif

    return NGX_OK;
}


#if !(NGX_WIN32)
static void
ngx_rtmp_exec_respawn(ngx_event_t *ev)
{
    ngx_rtmp_exec_run((ngx_rtmp_exec_t *) ev->data);
}


static void
ngx_rtmp_exec_child_dead(ngx_event_t *ev)
{
    ngx_connection_t   *dummy_conn = ev->data;
    ngx_rtmp_exec_t    *e;

    e = dummy_conn->data;

    ngx_log_error(NGX_LOG_INFO, e->log, 0,
                  "exec: child %ui exited; %s", (ngx_int_t) e->pid,
                  e->respawn_timeout == NGX_CONF_UNSET_MSEC ? "respawning" :
                                                               "ignoring");

    ngx_rtmp_exec_kill(e, 0);

    if (e->respawn_timeout == NGX_CONF_UNSET_MSEC) {
        return;
    }

    if (e->respawn_timeout == 0) {
        ngx_rtmp_exec_run(e);
        return;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_RTMP, e->log, 0,
                   "exec: shedule respawn %Mmsec", e->respawn_timeout);

    e->respawn_evt.data = e;
    e->respawn_evt.log = e->log;
    e->respawn_evt.handler = ngx_rtmp_exec_respawn;

    ngx_add_timer(&e->respawn_evt, e->respawn_timeout);
}


static ngx_int_t
ngx_rtmp_exec_kill(ngx_rtmp_exec_t *e, ngx_int_t kill_signal)
{
    if (e->respawn_evt.timer_set) {
        ngx_del_timer(&e->respawn_evt);
    }

    if (e->read_evt.active) {
        ngx_del_event(&e->read_evt, NGX_READ_EVENT, 0);
    }

    if (e->active == 0) {
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_INFO, e->log, 0,
                  "exec: terminating child %ui", (ngx_int_t) e->pid);

    e->active = 0;
    close(e->pipefd);
    if (e->save_pid) {
        *e->save_pid = NGX_INVALID_PID;
    }

    if (kill_signal == 0) {
        return NGX_OK;
    }

    if (kill(e->pid, kill_signal) == -1) {
        ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
                      "exec: kill failed pid=%i", (ngx_int_t) e->pid);
    } else {
        ngx_log_debug1(NGX_LOG_DEBUG_RTMP, e->log, 0,
                       "exec: killed pid=%i", (ngx_int_t) e->pid);
    }

    return NGX_OK;
}


static ngx_int_t
ngx_rtmp_exec_run(ngx_rtmp_exec_t *e)
{
    int                     fd, ret, maxfd, pipefd[2];
    char                  **args, **arg_out;
    ngx_pid_t               pid;
    ngx_str_t              *arg_in, a;
    ngx_uint_t              n;
    ngx_rtmp_exec_conf_t   *ec;

    ec = e->conf;

    ngx_log_error(NGX_LOG_INFO, e->log, 0,
                  "exec: starting %s child '%V'",
                  e->managed ? "managed" : "unmanaged", &ec->cmd);

    pipefd[0] = -1;
    pipefd[1] = -1;

    if (e->managed) {

        if (e->active) {
            ngx_log_debug1(NGX_LOG_DEBUG_RTMP, e->log, 0,
                           "exec: already active '%V'", &ec->cmd);
            return NGX_OK;
        }

        if (pipe(pipefd) == -1) {
            ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
                          "exec: pipe failed");
            return NGX_ERROR;
        }

        /* make pipe write end survive through exec */

        ret = fcntl(pipefd[1], F_GETFD);

        if (ret != -1) {
            ret &= ~FD_CLOEXEC;
            ret = fcntl(pipefd[1], F_SETFD, ret);
        }

        if (ret == -1) {

            close(pipefd[0]);
            close(pipefd[1]);

            ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
                          "exec: fcntl failed");

            return NGX_ERROR;
        }
    }

    pid = fork();

    switch (pid) {

        case -1:

            /* failure */

            if (pipefd[0] != -1) {
                close(pipefd[0]);
            }

            if (pipefd[1] != -1) {
                close(pipefd[1]);
            }

            ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
                          "exec: fork failed");

            return NGX_ERROR;

        case 0:

            /* child */

#if (NGX_LINUX)
            if (e->managed) {
                prctl(PR_SET_PDEATHSIG, e->kill_signal, 0, 0, 0);
            }
#endif

            /* close all descriptors but pipe write end */

            maxfd = sysconf(_SC_OPEN_MAX);
            for (fd = 0; fd < maxfd; ++fd) {
                if (fd == pipefd[1]) {
                    continue;
                }

                close(fd);
            }

            fd = open("/dev/null", O_RDWR);

            dup2(fd, STDIN_FILENO);
            dup2(fd, STDOUT_FILENO);
            dup2(fd, STDERR_FILENO);

            args = ngx_alloc((ec->args.nelts + 2) * sizeof(char *), e->log);
            if (args == NULL) {
                exit(1);
            }

            arg_in = ec->args.elts;
            arg_out = args;
            *arg_out++ = (char *) ec->cmd.data;

            for (n = 0; n < ec->args.nelts; n++, ++arg_in) {

                if (e->eval == NULL) {
                    a = *arg_in;
                } else {
                    ngx_rtmp_eval(e->eval_ctx, arg_in, e->eval, &a, e->log);
                }

                if (ngx_rtmp_eval_streams(&a) != NGX_DONE) {
                    continue;
                }

                *arg_out++ = (char *) a.data;
            }

            *arg_out = NULL;

#if (NGX_DEBUG)
            {
                char    **p;

                for (p = args; *p; p++) {
                    ngx_write_fd(STDERR_FILENO, "'", 1);
                    ngx_write_fd(STDERR_FILENO, *p, strlen(*p));
                    ngx_write_fd(STDERR_FILENO, "' ", 2);
                }

                ngx_write_fd(STDERR_FILENO, "\n", 1);
            }
#endif

            if (execvp((char *) ec->cmd.data, args) == -1) {
                char    *msg;

                msg = strerror(errno);

                ngx_write_fd(STDERR_FILENO, "execvp error: ", 14);
                ngx_write_fd(STDERR_FILENO, msg, strlen(msg));
                ngx_write_fd(STDERR_FILENO, "\n", 1);

                exit(1);
            }

            break;

        default:

            /* parent */

            if (pipefd[1] != -1) {
                close(pipefd[1]);
            }

            if (pipefd[0] != -1) {

                e->active = 1;
                e->pid = pid;
                e->pipefd = pipefd[0];

                if (e->save_pid) {
                    *e->save_pid = pid;
                }

                e->dummy_conn.fd = e->pipefd;
                e->dummy_conn.data = e;
                e->dummy_conn.read  = &e->read_evt;
                e->dummy_conn.write = &e->write_evt;
                e->read_evt.data  = &e->dummy_conn;
                e->write_evt.data = &e->dummy_conn;

                e->read_evt.log = e->log;
                e->read_evt.handler = ngx_rtmp_exec_child_dead;

                if (ngx_add_event(&e->read_evt, NGX_READ_EVENT, 0) != NGX_OK) {
                    ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
                                  "exec: failed to add child control event");
                }
            }

            ngx_log_debug2(NGX_LOG_DEBUG_RTMP, e->log, 0,
                           "exec: child '%V' started pid=%i",
                           &ec->cmd, (ngx_int_t) pid);
            break;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_rtmp_exec_init_ctx(ngx_rtmp_session_t *s, u_char name[NGX_RTMP_MAX_NAME],
    u_char args[NGX_RTMP_MAX_ARGS], ngx_uint_t flags)
{
    ngx_uint_t                  n;
    ngx_array_t                *push_conf;
    ngx_rtmp_exec_t            *e;
    ngx_rtmp_exec_ctx_t        *ctx;
    ngx_rtmp_exec_conf_t       *ec;
    ngx_rtmp_exec_app_conf_t   *eacf;
    ngx_rtmp_exec_main_conf_t  *emcf;

    ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);

    if (ctx != NULL) {
        goto done;
    }

    ctx = ngx_pcalloc(s->pool, sizeof(ngx_rtmp_exec_ctx_t));

    if (ctx == NULL) {
        return NGX_ERROR;
    }

    ngx_rtmp_set_ctx(s, ctx, ngx_rtmp_exec_module);

    eacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_exec_module);

    emcf = ngx_rtmp_get_module_main_conf(s, ngx_rtmp_exec_module);

    push_conf = &eacf->conf[NGX_RTMP_EXEC_PUSH];

    if (push_conf->nelts > 0) {

        if (ngx_array_init(&ctx->push_exec, s->pool,
                           push_conf->nelts,
                           sizeof(ngx_rtmp_exec_t)) != NGX_OK)
        {
            return NGX_ERROR;
        }

        e = ngx_array_push_n(&ctx->push_exec, push_conf->nelts);

        if (e == NULL) {
            return NGX_ERROR;
        }

        ec = push_conf->elts;

        for (n = 0; n < push_conf->nelts; n++, e++, ec++) {
            ngx_memzero(e, sizeof(*e));
            e->conf = ec;
            e->managed = 1;
            e->log = s->log;
            e->eval = ngx_rtmp_exec_push_eval;
            e->eval_ctx = s;
            e->kill_signal = emcf->kill_signal;
            e->respawn_timeout = (eacf->respawn ? emcf->respawn_timeout :
                                  NGX_CONF_UNSET_MSEC);
        }
    }

done:

    ngx_memcpy(ctx->name, name, NGX_RTMP_MAX_NAME);
    ngx_memcpy(ctx->args, args, NGX_RTMP_MAX_ARGS);

    ctx->flags |= flags;

    return NGX_OK;
}


static ngx_int_t
ngx_rtmp_exec_init_pull_ctx(ngx_rtmp_session_t *s,
    u_char name[NGX_RTMP_MAX_NAME])
{
    size_t                      len;
    ngx_uint_t                  n;
    ngx_pool_t                 *pool;
    ngx_array_t                *pull_conf;
    ngx_rtmp_exec_t            *e;
    ngx_rtmp_exec_ctx_t        *ctx;
    ngx_rtmp_exec_conf_t       *ec;
    ngx_rtmp_exec_pull_ctx_t   *pctx, **ppctx;
    ngx_rtmp_exec_app_conf_t   *eacf;
    ngx_rtmp_exec_main_conf_t  *emcf;

    ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
    if (ctx->pull != NULL) {
        return NGX_OK;
    }

    eacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_exec_module);

    pull_conf = &eacf->conf[NGX_RTMP_EXEC_PULL];

    if (pull_conf->nelts == 0) {
        return NGX_OK;
    }

    emcf = ngx_rtmp_get_module_main_conf(s, ngx_rtmp_exec_module);

    len = ngx_strlen(name);

    ppctx = &eacf->pull[ngx_hash_key(name, len) % eacf->nbuckets];

    for (; *ppctx; ppctx = &(*ppctx)->next) {
        pctx = *ppctx;

        if (pctx->name.len == len &&
            ngx_strncmp(name, pctx->name.data, len) == 0)
        {
            goto done;
        }
    }

    pool = NGX_CREATE_POOL(4096, emcf->log);
    if (pool == NULL) {
        return NGX_ERROR;
    }

    pctx = ngx_pcalloc(pool, sizeof(ngx_rtmp_exec_pull_ctx_t));
    if (pctx == NULL) {
        goto error;
    }

    pctx->pool = pool;
    pctx->name.len = len;
    pctx->name.data = ngx_palloc(pool, len);

    if (pctx->name.data == NULL) {
        goto error;
    }

    ngx_memcpy(pctx->name.data, name, len);

    pctx->app.len = s->app.len;
    pctx->app.data = ngx_palloc(pool, s->app.len);

    if (pctx->app.data == NULL) {
        goto error;
    }

    ngx_memcpy(pctx->app.data, s->app.data, s->app.len);

    if (ngx_array_init(&pctx->pull_exec, pool, pull_conf->nelts,
                       sizeof(ngx_rtmp_exec_t)) != NGX_OK)
    {
        goto error;
    }

    e = ngx_array_push_n(&pctx->pull_exec, pull_conf->nelts);
    if (e == NULL) {
        goto error;
    }

    ec = pull_conf->elts;
    for (n = 0; n < pull_conf->nelts; n++, e++, ec++) {
        ngx_memzero(e, sizeof(*e));
        e->conf = ec;
        e->managed = 1;
        e->log = emcf->log;
        e->eval = ngx_rtmp_exec_pull_eval;
        e->eval_ctx = pctx;
        e->kill_signal = emcf->kill_signal;
        e->respawn_timeout = (eacf->respawn ? emcf->respawn_timeout :
                                              NGX_CONF_UNSET_MSEC);
    }

    *ppctx = pctx;

done:

    ctx->pull = pctx;
    ctx->pull->counter++;

    return NGX_OK;

error:

    NGX_DESTROY_POOL(pool);

    return NGX_ERROR;
}


static ngx_int_t
ngx_rtmp_exec_filter(ngx_rtmp_session_t *s, ngx_rtmp_exec_conf_t *ec)
{
    size_t                len;
    ngx_str_t            *v;
    ngx_uint_t            n;
    ngx_rtmp_exec_ctx_t  *ctx;

    if (ec->names.nelts == 0) {
        return NGX_OK;
    }

    ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);

    len = ngx_strlen(ctx->name);

    v = ec->names.elts;
    for (n = 0; n < ec->names.nelts; n++, s++) {
        if (v->len == len && ngx_strncmp(v->data, ctx->name, len) == 0) {
            return NGX_OK;
        }
    }

    return NGX_DECLINED;
}


static void
ngx_rtmp_exec_unmanaged(ngx_rtmp_session_t *s, ngx_array_t *e, const char *op)
{
    ngx_uint_t             n;
    ngx_rtmp_exec_t        en;
    ngx_rtmp_exec_conf_t  *ec;

    if (e->nelts == 0) {
        return;
    }

    ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->log, 0,
                   "exec: %s %uz unmanaged command(s)", op, e->nelts);

    ec = e->elts;
    for (n = 0; n < e->nelts; n++, ec++) {
        if (ngx_rtmp_exec_filter(s, ec) != NGX_OK) {
            continue;
        }

        ngx_memzero(&en, sizeof(ngx_rtmp_exec_t));

        en.conf = ec;
        en.eval = ngx_rtmp_exec_event_eval;
        en.eval_ctx = s;
        en.log = s->log;

        ngx_rtmp_exec_run(&en);
    }
}


static void
ngx_rtmp_exec_managed(ngx_rtmp_session_t *s, ngx_array_t *e, const char *op)
{
    ngx_uint_t        n;
    ngx_rtmp_exec_t  *en;

    if (e->nelts == 0) {
        return;
    }

    ngx_log_debug2(NGX_LOG_DEBUG_RTMP, s->log, 0,
                   "exec: %s %uz managed command(s)", op, e->nelts);

    en = e->elts;
    for (n = 0; n < e->nelts; n++, en++) {
        if (ngx_rtmp_exec_filter(s, en->conf) == NGX_OK) {
            ngx_rtmp_exec_run(en);
        }
    }
}


static ngx_int_t
ngx_rtmp_exec_publish(ngx_rtmp_session_t *s, ngx_rtmp_publish_t *v)
{
    ngx_rtmp_exec_ctx_t       *ctx;
    ngx_rtmp_exec_app_conf_t  *eacf;

    eacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_exec_module);

    if (eacf == NULL || !eacf->active) {
        goto next;
    }

    if (s->interprocess) {
        goto next;
    }

    if (ngx_rtmp_exec_init_ctx(s, v->name, v->args, NGX_RTMP_EXEC_PUBLISHING)
        != NGX_OK)
    {
        goto next;
    }

    ngx_rtmp_exec_unmanaged(s, &eacf->conf[NGX_RTMP_EXEC_PUBLISH], "publish");

    ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);

    ngx_rtmp_exec_managed(s, &ctx->push_exec, "push");

next:
    return next_publish(s, v);
}


static ngx_int_t
ngx_rtmp_exec_play(ngx_rtmp_session_t *s, ngx_rtmp_play_t *v)
{
    ngx_rtmp_exec_ctx_t       *ctx;
    ngx_rtmp_exec_pull_ctx_t  *pctx;
    ngx_rtmp_exec_app_conf_t  *eacf;

    eacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_exec_module);

    if (eacf == NULL || !eacf->active) {
        goto next;
    }

    if (ngx_rtmp_exec_init_ctx(s, v->name, v->args, NGX_RTMP_EXEC_PLAYING)
        != NGX_OK)
    {
        goto next;
    }

    ngx_rtmp_exec_unmanaged(s, &eacf->conf[NGX_RTMP_EXEC_PLAY], "play");

    if (ngx_rtmp_exec_init_pull_ctx(s, v->name) != NGX_OK) {
        goto next;
    }

    ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
    pctx = ctx->pull;

    if (pctx && pctx->counter == 1) {
        ngx_rtmp_exec_managed(s, &pctx->pull_exec, "pull");
    }

next:
    return next_play(s, v);
}


static ngx_int_t
ngx_rtmp_exec_close_stream(ngx_rtmp_session_t *s, ngx_rtmp_close_stream_t *v)
{
    size_t                     n;
    ngx_rtmp_exec_t           *e;
    ngx_rtmp_exec_ctx_t       *ctx;
    ngx_rtmp_exec_pull_ctx_t  *pctx, **ppctx;
    ngx_rtmp_exec_app_conf_t  *eacf;

    eacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_exec_module);
    if (eacf == NULL) {
        goto next;
    }

    ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
    if (ctx == NULL) {
        goto next;
    }

    if (ctx->flags & NGX_RTMP_EXEC_PUBLISHING) {
        ngx_rtmp_exec_unmanaged(s, &eacf->conf[NGX_RTMP_EXEC_PUBLISH_DONE],
                                "publish_done");
    }

    if (ctx->flags & NGX_RTMP_EXEC_PLAYING) {
        ngx_rtmp_exec_unmanaged(s, &eacf->conf[NGX_RTMP_EXEC_PLAY_DONE],
                                "play_done");
    }

    ctx->flags = 0;

    if (ctx->push_exec.nelts > 0) {
        ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
                       "exec: delete %uz push command(s)",
                       ctx->push_exec.nelts);

        e = ctx->push_exec.elts;
        for (n = 0; n < ctx->push_exec.nelts; n++, e++) {
            ngx_rtmp_exec_kill(e, e->kill_signal);
        }
    }

    pctx = ctx->pull;

    if (pctx && --pctx->counter == 0) {
        ngx_log_debug1(NGX_LOG_DEBUG_RTMP, s->log, 0,
                       "exec: delete %uz pull command(s)",
                       pctx->pull_exec.nelts);

        e = pctx->pull_exec.elts;
        for (n = 0; n < pctx->pull_exec.nelts; n++, e++) {
            ngx_rtmp_exec_kill(e, e->kill_signal);
        }

        ppctx = &eacf->pull[ngx_hash_key(pctx->name.data, pctx->name.len) %
                            eacf->nbuckets];

        for (; *ppctx; ppctx = &(*ppctx)->next) {
            if (pctx == *ppctx) {
                *ppctx = pctx->next;
                break;
            }
        }

        NGX_DESTROY_POOL(pctx->pool);
    }

    ctx->pull = NULL;

next:
    return next_close_stream(s, v);
}
#endif /* NGX_WIN32 */


static char *
ngx_rtmp_exec_conf(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    char  *p = conf;

    size_t                     n, nargs;
    ngx_str_t                 *s, *value, v;
    ngx_array_t               *confs;
    ngx_rtmp_exec_conf_t      *ec;
    ngx_rtmp_exec_app_conf_t  *eacf;

    confs = (ngx_array_t *) (p + cmd->offset);

    eacf = ngx_rtmp_conf_get_module_app_conf(cf, ngx_rtmp_exec_module);

    if (confs->nalloc == 0 && ngx_array_init(confs, cf->pool, 1,
                                             sizeof(ngx_rtmp_exec_conf_t))
                              != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    value = cf->args->elts;

    ec = ngx_array_push(confs);
    if (ec == NULL) {
        return NGX_CONF_ERROR;
    }

    ngx_memzero(ec, sizeof(ngx_rtmp_exec_conf_t));

    /* type is undefined for explicit execs */

    ec->type = NGX_CONF_UNSET_UINT;
    ec->cmd = value[1];

    if (ngx_array_init(&ec->names, cf->pool, 1, sizeof(ngx_str_t)) != NGX_OK) {
        return NGX_CONF_ERROR;
    }

    if (cf->args->nelts == 2) {
        return NGX_CONF_OK;
    }

    nargs = cf->args->nelts - 2;
    if (ngx_array_init(&ec->args, cf->pool, nargs, sizeof(ngx_str_t)) != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    for (n = 2; n < cf->args->nelts; n++) {

        v = value[n];

        if (eacf->options == 1) {

            if (v.len >= 5 && ngx_strncmp(v.data, "name=", 5) == 0) {

                s = ngx_array_push(&ec->names);
                if (s == NULL) {
                    return NGX_CONF_ERROR;
                }

                v.data += 5;
                v.len -= 5;

                *s = v;

                continue;
            }
        }

        s = ngx_array_push(&ec->args);
        if (s == NULL) {
            return NGX_CONF_ERROR;
        }

        *s = v;
    }

    return NGX_CONF_OK;
}

/*
static char *
ngx_rtmp_exec_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    char                       *rv;
    ngx_str_t                  *value;
    ngx_conf_t                  save;
    ngx_array_t                *confs;
    ngx_rtmp_conf_ctx_t        *ctx, *pctx;
    ngx_rtmp_exec_conf_t       *ec, *eec;
    ngx_rtmp_exec_app_conf_t   *eacf;
    ngx_rtmp_exec_main_conf_t  *emcf;

    value = cf->args->elts;

    eacf = ngx_rtmp_conf_get_module_app_conf(cf, ngx_rtmp_exec_module);

    emcf = ngx_rtmp_conf_get_module_main_conf(cf, ngx_rtmp_exec_module);

    ctx = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_conf_ctx_t));
    if (ctx == NULL) {
        return NGX_CONF_ERROR;
    }

    pctx = cf->ctx;

    ctx->main_conf = pctx->main_conf;
    ctx->srv_conf  = pctx->srv_conf;

    ctx->app_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_rtmp_max_module);
    if (ctx->app_conf == NULL) {
        return NGX_CONF_ERROR;
    }

    ec = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_exec_conf_t));
    if (ec == NULL) {
        return NGX_CONF_ERROR;
    }

    ec->id = value[1];
    ec->type = NGX_CONF_UNSET_UINT;

    ctx->app_conf[ngx_rtmp_exec_module.ctx_index] = ec;

    save = *cf;

    cf->ctx = ctx;
    cf->cmd_type = NGX_RTMP_EXEC_CONF;

    rv = ngx_conf_parse(cf, NULL);
    *cf= save;

    switch (ec->type) {

        case NGX_RTMP_EXEC_STATIC:
            confs = &emcf->static_conf;
            break;

        case NGX_CONF_UNSET_UINT:
            return "unspecified exec type";

        default:
            confs = &eacf->conf[ec->type];
    }

    if (confs->nalloc == 0 && ngx_array_init(confs, cf->pool, 1,
                                             sizeof(ngx_rtmp_exec_conf_t))
                             != NGX_OK)
    {
        return NGX_CONF_ERROR;
    }

    eec = ngx_array_push(confs);
    if (eec == NULL) {
        return NGX_CONF_ERROR;
    }

    *eec = *ec;

    return rv;
}
*/

static char *
ngx_rtmp_exec_kill_signal(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
    ngx_rtmp_exec_main_conf_t  *emcf = conf;

    ngx_str_t  *value;

    value = cf->args->elts;
    value++;

    emcf->kill_signal = ngx_atoi(value->data, value->len);
    if (emcf->kill_signal != NGX_ERROR) {
        return NGX_CONF_OK;
    }

#define NGX_RMTP_EXEC_SIGNAL(name)                                          \
    if (value->len == sizeof(#name) - 1 &&                                  \
        ngx_strncasecmp(value->data, (u_char *) #name, value->len) == 0)    \
    {                                                                       \
        emcf->kill_signal = SIG##name;                                      \
        return NGX_CONF_OK;                                                 \
    }

    /* POSIX.1-1990 signals */

#if !(NGX_WIN32)
    NGX_RMTP_EXEC_SIGNAL(HUP);
    NGX_RMTP_EXEC_SIGNAL(INT);
    NGX_RMTP_EXEC_SIGNAL(QUIT);
    NGX_RMTP_EXEC_SIGNAL(ILL);
    NGX_RMTP_EXEC_SIGNAL(ABRT);
    NGX_RMTP_EXEC_SIGNAL(FPE);
    NGX_RMTP_EXEC_SIGNAL(KILL);
    NGX_RMTP_EXEC_SIGNAL(SEGV);
    NGX_RMTP_EXEC_SIGNAL(PIPE);
    NGX_RMTP_EXEC_SIGNAL(ALRM);
    NGX_RMTP_EXEC_SIGNAL(TERM);
    NGX_RMTP_EXEC_SIGNAL(USR1);
    NGX_RMTP_EXEC_SIGNAL(USR2);
    NGX_RMTP_EXEC_SIGNAL(CHLD);
    NGX_RMTP_EXEC_SIGNAL(CONT);
    NGX_RMTP_EXEC_SIGNAL(STOP);
    NGX_RMTP_EXEC_SIGNAL(TSTP);
    NGX_RMTP_EXEC_SIGNAL(TTIN);
    NGX_RMTP_EXEC_SIGNAL(TTOU);
#endif

#undef NGX_RMTP_EXEC_SIGNAL

    return "unknown signal";
}


static ngx_int_t
ngx_rtmp_exec_postconfiguration(ngx_conf_t *cf)
{
#if !(NGX_WIN32)

    next_publish = ngx_rtmp_publish;
    ngx_rtmp_publish = ngx_rtmp_exec_publish;

    next_play = ngx_rtmp_play;
    ngx_rtmp_play = ngx_rtmp_exec_play;

    next_close_stream = ngx_rtmp_close_stream;
    ngx_rtmp_close_stream = ngx_rtmp_exec_close_stream;

#endif /* NGX_WIN32 */

    return NGX_OK;
}