Mercurial > hg > nginx
view src/core/ngx_palloc.c @ 7838:815c63581be4
Mail: POP3 pipelining support.
The change is mostly the same as the SMTP one (04e43d03e153 and 3f5d0af4e40a),
and ensures that nginx is able to properly handle or reject multiple POP3
commands, as required by the PIPELINING capability (RFC 2449). The s->cmd
field is not really used and set for consistency.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 19 May 2021 03:13:18 +0300 |
parents | ad2360782ecd |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> static ngx_inline void *ngx_palloc_small(ngx_pool_t *pool, size_t size, ngx_uint_t align); static void *ngx_palloc_block(ngx_pool_t *pool, size_t size); static void *ngx_palloc_large(ngx_pool_t *pool, size_t size); ngx_pool_t * ngx_create_pool(size_t size, ngx_log_t *log) { ngx_pool_t *p; p = ngx_memalign(NGX_POOL_ALIGNMENT, size, log); if (p == NULL) { return NULL; } p->d.last = (u_char *) p + sizeof(ngx_pool_t); p->d.end = (u_char *) p + size; p->d.next = NULL; p->d.failed = 0; size = size - sizeof(ngx_pool_t); p->max = (size < NGX_MAX_ALLOC_FROM_POOL) ? size : NGX_MAX_ALLOC_FROM_POOL; p->current = p; p->chain = NULL; p->large = NULL; p->cleanup = NULL; p->log = log; return p; } void ngx_destroy_pool(ngx_pool_t *pool) { ngx_pool_t *p, *n; ngx_pool_large_t *l; ngx_pool_cleanup_t *c; for (c = pool->cleanup; c; c = c->next) { if (c->handler) { ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "run cleanup: %p", c); c->handler(c->data); } } #if (NGX_DEBUG) /* * we could allocate the pool->log from this pool * so we cannot use this log while free()ing the pool */ for (l = pool->large; l; l = l->next) { ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "free: %p", l->alloc); } for (p = pool, n = pool->d.next; /* void */; p = n, n = n->d.next) { ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "free: %p, unused: %uz", p, p->d.end - p->d.last); if (n == NULL) { break; } } #endif for (l = pool->large; l; l = l->next) { if (l->alloc) { ngx_free(l->alloc); } } for (p = pool, n = pool->d.next; /* void */; p = n, n = n->d.next) { ngx_free(p); if (n == NULL) { break; } } } void ngx_reset_pool(ngx_pool_t *pool) { ngx_pool_t *p; ngx_pool_large_t *l; for (l = pool->large; l; l = l->next) { if (l->alloc) { ngx_free(l->alloc); } } for (p = pool; p; p = p->d.next) { p->d.last = (u_char *) p + sizeof(ngx_pool_t); p->d.failed = 0; } pool->current = pool; pool->chain = NULL; pool->large = NULL; } void * ngx_palloc(ngx_pool_t *pool, size_t size) { #if !(NGX_DEBUG_PALLOC) if (size <= pool->max) { return ngx_palloc_small(pool, size, 1); } #endif return ngx_palloc_large(pool, size); } void * ngx_pnalloc(ngx_pool_t *pool, size_t size) { #if !(NGX_DEBUG_PALLOC) if (size <= pool->max) { return ngx_palloc_small(pool, size, 0); } #endif return ngx_palloc_large(pool, size); } static ngx_inline void * ngx_palloc_small(ngx_pool_t *pool, size_t size, ngx_uint_t align) { u_char *m; ngx_pool_t *p; p = pool->current; do { m = p->d.last; if (align) { m = ngx_align_ptr(m, NGX_ALIGNMENT); } if ((size_t) (p->d.end - m) >= size) { p->d.last = m + size; return m; } p = p->d.next; } while (p); return ngx_palloc_block(pool, size); } static void * ngx_palloc_block(ngx_pool_t *pool, size_t size) { u_char *m; size_t psize; ngx_pool_t *p, *new; psize = (size_t) (pool->d.end - (u_char *) pool); m = ngx_memalign(NGX_POOL_ALIGNMENT, psize, pool->log); if (m == NULL) { return NULL; } new = (ngx_pool_t *) m; new->d.end = m + psize; new->d.next = NULL; new->d.failed = 0; m += sizeof(ngx_pool_data_t); m = ngx_align_ptr(m, NGX_ALIGNMENT); new->d.last = m + size; for (p = pool->current; p->d.next; p = p->d.next) { if (p->d.failed++ > 4) { pool->current = p->d.next; } } p->d.next = new; return m; } static void * ngx_palloc_large(ngx_pool_t *pool, size_t size) { void *p; ngx_uint_t n; ngx_pool_large_t *large; p = ngx_alloc(size, pool->log); if (p == NULL) { return NULL; } n = 0; for (large = pool->large; large; large = large->next) { if (large->alloc == NULL) { large->alloc = p; return p; } if (n++ > 3) { break; } } large = ngx_palloc_small(pool, sizeof(ngx_pool_large_t), 1); if (large == NULL) { ngx_free(p); return NULL; } large->alloc = p; large->next = pool->large; pool->large = large; return p; } void * ngx_pmemalign(ngx_pool_t *pool, size_t size, size_t alignment) { void *p; ngx_pool_large_t *large; p = ngx_memalign(alignment, size, pool->log); if (p == NULL) { return NULL; } large = ngx_palloc_small(pool, sizeof(ngx_pool_large_t), 1); if (large == NULL) { ngx_free(p); return NULL; } large->alloc = p; large->next = pool->large; pool->large = large; return p; } ngx_int_t ngx_pfree(ngx_pool_t *pool, void *p) { ngx_pool_large_t *l; for (l = pool->large; l; l = l->next) { if (p == l->alloc) { ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, pool->log, 0, "free: %p", l->alloc); ngx_free(l->alloc); l->alloc = NULL; return NGX_OK; } } return NGX_DECLINED; } void * ngx_pcalloc(ngx_pool_t *pool, size_t size) { void *p; p = ngx_palloc(pool, size); if (p) { ngx_memzero(p, size); } return p; } ngx_pool_cleanup_t * ngx_pool_cleanup_add(ngx_pool_t *p, size_t size) { ngx_pool_cleanup_t *c; c = ngx_palloc(p, sizeof(ngx_pool_cleanup_t)); if (c == NULL) { return NULL; } if (size) { c->data = ngx_palloc(p, size); if (c->data == NULL) { return NULL; } } else { c->data = NULL; } c->handler = NULL; c->next = p->cleanup; p->cleanup = c; ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, p->log, 0, "add cleanup: %p", c); return c; } void ngx_pool_run_cleanup_file(ngx_pool_t *p, ngx_fd_t fd) { ngx_pool_cleanup_t *c; ngx_pool_cleanup_file_t *cf; for (c = p->cleanup; c; c = c->next) { if (c->handler == ngx_pool_cleanup_file) { cf = c->data; if (cf->fd == fd) { c->handler(cf); c->handler = NULL; return; } } } } void ngx_pool_cleanup_file(void *data) { ngx_pool_cleanup_file_t *c = data; ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, c->log, 0, "file cleanup: fd:%d", c->fd); if (ngx_close_file(c->fd) == NGX_FILE_ERROR) { ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, ngx_close_file_n " \"%s\" failed", c->name); } } void ngx_pool_delete_file(void *data) { ngx_pool_cleanup_file_t *c = data; ngx_err_t err; ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, c->log, 0, "file cleanup: fd:%d %s", c->fd, c->name); if (ngx_delete_file(c->name) == NGX_FILE_ERROR) { err = ngx_errno; if (err != NGX_ENOENT) { ngx_log_error(NGX_LOG_CRIT, c->log, err, ngx_delete_file_n " \"%s\" failed", c->name); } } if (ngx_close_file(c->fd) == NGX_FILE_ERROR) { ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, ngx_close_file_n " \"%s\" failed", c->name); } } #if 0 static void * ngx_get_cached_block(size_t size) { void *p; ngx_cached_block_slot_t *slot; if (ngx_cycle->cache == NULL) { return NULL; } slot = &ngx_cycle->cache[(size + ngx_pagesize - 1) / ngx_pagesize]; slot->tries++; if (slot->number) { p = slot->block; slot->block = slot->block->next; slot->number--; return p; } return NULL; } #endif