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view src/os/unix/ngx_process_cycle.h @ 5356:acd51b0f6fd4

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Disable symlinks: use O_PATH to open path components. It was introduced in Linux 2.6.39, glibc 2.14 and allows to obtain file descriptors without actually opening files. Thus made it possible to traverse path with openat() syscalls without the need to have read permissions for path components. It is effectively emulates O_SEARCH which is missing on Linux. O_PATH is used in combination with O_RDONLY. The last one is ignored if O_PATH is used, but it allows nginx to not fail when it was built on modern system (i.e. glibc 2.14+) and run with a kernel older than 2.6.39. Then O_PATH is unknown to the kernel and ignored, while O_RDONLY is used. Sadly, fstat() is not working with O_PATH descriptors till Linux 3.6. As a workaround we fallback to fstatat() with the AT_EMPTY_PATH flag that was introduced at the same time as O_PATH.
author Valentin Bartenev <vbart@nginx.com>
date Mon, 02 Sep 2013 08:07:59 +0400
parents d620f497c50f
children 4652f8f26b12
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_PROCESS_CYCLE_H_INCLUDED_
#define _NGX_PROCESS_CYCLE_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


#define NGX_CMD_OPEN_CHANNEL   1
#define NGX_CMD_CLOSE_CHANNEL  2
#define NGX_CMD_QUIT           3
#define NGX_CMD_TERMINATE      4
#define NGX_CMD_REOPEN         5


#define NGX_PROCESS_SINGLE     0
#define NGX_PROCESS_MASTER     1
#define NGX_PROCESS_SIGNALLER  2
#define NGX_PROCESS_WORKER     3
#define NGX_PROCESS_HELPER     4


typedef struct {
    ngx_event_handler_pt       handler;
    char                      *name;
    ngx_msec_t                 delay;
} ngx_cache_manager_ctx_t;


void ngx_master_process_cycle(ngx_cycle_t *cycle);
void ngx_single_process_cycle(ngx_cycle_t *cycle);


extern ngx_uint_t      ngx_process;
extern ngx_pid_t       ngx_pid;
extern ngx_pid_t       ngx_new_binary;
extern ngx_uint_t      ngx_inherited;
extern ngx_uint_t      ngx_daemonized;
extern ngx_uint_t      ngx_threaded;
extern ngx_uint_t      ngx_exiting;

extern sig_atomic_t    ngx_reap;
extern sig_atomic_t    ngx_sigio;
extern sig_atomic_t    ngx_sigalrm;
extern sig_atomic_t    ngx_quit;
extern sig_atomic_t    ngx_debug_quit;
extern sig_atomic_t    ngx_terminate;
extern sig_atomic_t    ngx_noaccept;
extern sig_atomic_t    ngx_reconfigure;
extern sig_atomic_t    ngx_reopen;
extern sig_atomic_t    ngx_change_binary;


#endif /* _NGX_PROCESS_CYCLE_H_INCLUDED_ */