Mercurial > hg > nginx
view src/core/ngx_queue.c @ 9269:4eb02e5ddb48
Core: added realpath() checking when testing PID files.
This ensures that if the PID file path is changed, yet resolves to the
same file via symbolic links, trying to recreate the PID file won't
remove it. In particular, this resolves issues as observed on Linux
systems with "/var/run/nginx.pid" changed to "/run/nginx.pid".
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 13 May 2024 06:13:12 +0300 |
parents | 3038bd4d7816 |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> static void ngx_queue_merge(ngx_queue_t *queue, ngx_queue_t *tail, ngx_int_t (*cmp)(const ngx_queue_t *, const ngx_queue_t *)); /* * find the middle queue element if the queue has odd number of elements * or the first element of the queue's second part otherwise */ ngx_queue_t * ngx_queue_middle(ngx_queue_t *queue) { ngx_queue_t *middle, *next; middle = ngx_queue_head(queue); if (middle == ngx_queue_last(queue)) { return middle; } next = ngx_queue_head(queue); for ( ;; ) { middle = ngx_queue_next(middle); next = ngx_queue_next(next); if (next == ngx_queue_last(queue)) { return middle; } next = ngx_queue_next(next); if (next == ngx_queue_last(queue)) { return middle; } } } /* the stable merge sort */ void ngx_queue_sort(ngx_queue_t *queue, ngx_int_t (*cmp)(const ngx_queue_t *, const ngx_queue_t *)) { ngx_queue_t *q, tail; q = ngx_queue_head(queue); if (q == ngx_queue_last(queue)) { return; } q = ngx_queue_middle(queue); ngx_queue_split(queue, q, &tail); ngx_queue_sort(queue, cmp); ngx_queue_sort(&tail, cmp); ngx_queue_merge(queue, &tail, cmp); } static void ngx_queue_merge(ngx_queue_t *queue, ngx_queue_t *tail, ngx_int_t (*cmp)(const ngx_queue_t *, const ngx_queue_t *)) { ngx_queue_t *q1, *q2; q1 = ngx_queue_head(queue); q2 = ngx_queue_head(tail); for ( ;; ) { if (q1 == ngx_queue_sentinel(queue)) { ngx_queue_add(queue, tail); break; } if (q2 == ngx_queue_sentinel(tail)) { break; } if (cmp(q1, q2) <= 0) { q1 = ngx_queue_next(q1); continue; } ngx_queue_remove(q2); ngx_queue_insert_before(q1, q2); q2 = ngx_queue_head(tail); } }