Mercurial > hg > nginx-quic
view src/os/unix/ngx_freebsd_rfork_thread.h @ 5356:acd51b0f6fd4
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 | 15a7deeaa19a |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_FREEBSD_RFORK_THREAD_H_INCLUDED_ #define _NGX_FREEBSD_RFORK_THREAD_H_INCLUDED_ #include <sys/ipc.h> #include <sys/sem.h> #include <sched.h> typedef pid_t ngx_tid_t; #define ngx_log_pid ngx_thread_self() #define ngx_log_tid 0 #define NGX_TID_T_FMT "%P" #define NGX_MUTEX_LIGHT 1 #define NGX_MUTEX_LOCK_BUSY 0x80000000 typedef volatile struct { ngx_atomic_t lock; ngx_log_t *log; int semid; } ngx_mutex_t; #define NGX_CV_SIGNAL 64 typedef struct { int signo; int kq; ngx_tid_t tid; ngx_log_t *log; } ngx_cond_t; #define ngx_thread_sigmask(how, set, oset) \ (sigprocmask(how, set, oset) == -1) ? ngx_errno : 0 #define ngx_thread_sigmask_n "sigprocmask()" #define ngx_thread_join(t, p) #define ngx_setthrtitle(n) setproctitle(n) extern char *ngx_freebsd_kern_usrstack; extern size_t ngx_thread_stack_size; static ngx_inline ngx_int_t ngx_gettid(void) { char *sp; if (ngx_thread_stack_size == 0) { return 0; } #if ( __i386__ ) __asm__ volatile ("mov %%esp, %0" : "=q" (sp)); #elif ( __amd64__ ) __asm__ volatile ("mov %%rsp, %0" : "=q" (sp)); #else #error "rfork()ed threads are not supported on this platform" #endif return (ngx_freebsd_kern_usrstack - sp) / ngx_thread_stack_size; } ngx_tid_t ngx_thread_self(void); typedef ngx_uint_t ngx_tls_key_t; #define NGX_THREAD_KEYS_MAX 16 extern void **ngx_tls; ngx_err_t ngx_thread_key_create(ngx_tls_key_t *key); #define ngx_thread_key_create_n "the tls key creation" ngx_err_t ngx_thread_set_tls(ngx_tls_key_t key, void *value); #define ngx_thread_set_tls_n "the tls key setting" static void * ngx_thread_get_tls(ngx_tls_key_t key) { if (key >= NGX_THREAD_KEYS_MAX) { return NULL; } return ngx_tls[key * NGX_THREAD_KEYS_MAX + ngx_gettid()]; } #define ngx_mutex_trylock(m) ngx_mutex_dolock(m, 1) #define ngx_mutex_lock(m) (void) ngx_mutex_dolock(m, 0) ngx_int_t ngx_mutex_dolock(ngx_mutex_t *m, ngx_int_t try); void ngx_mutex_unlock(ngx_mutex_t *m); typedef int (*ngx_rfork_thread_func_pt)(void *arg); #endif /* _NGX_FREEBSD_RFORK_THREAD_H_INCLUDED_ */