Mercurial > hg > nginx-vendor-0-8
view src/os/unix/ngx_files.c @ 77:e6b3de2dc637
Added tag NGINX_0_1_38 for changeset da9a3b14312d
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Fri, 08 Jul 2005 00:00:00 +0400 |
parents | 72eb30262aac |
children | dad2fe8ecf08 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> ssize_t ngx_read_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset) { ssize_t n; ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, "read: %d, %p, %uz, %O", file->fd, buf, size, offset); #if (NGX_HAVE_PREAD) n = pread(file->fd, buf, size, offset); if (n == -1) { ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "pread() failed, file \"%s\"", file->name.data); return NGX_ERROR; } #else if (file->sys_offset != offset) { if (lseek(file->fd, offset, SEEK_SET) == -1) { ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed"); return NGX_ERROR; } file->sys_offset = offset; } n = read(file->fd, buf, size); if (n == -1) { ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "read() failed"); return NGX_ERROR; } file->sys_offset += n; #endif file->offset += n; return n; } ssize_t ngx_write_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset) { ssize_t n; ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, "write: %d, %p, %uz, %O", file->fd, buf, size, offset); #if (NGX_HAVE_PWRITE) n = pwrite(file->fd, buf, size, offset); if (n == -1) { ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "pwrite() failed"); return NGX_ERROR; } if ((size_t) n != size) { ngx_log_error(NGX_LOG_CRIT, file->log, 0, "pwrite() has written only %z of %uz", n, size); return NGX_ERROR; } #else if (file->sys_offset != offset) { if (lseek(file->fd, offset, SEEK_SET) == -1) { ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed"); return NGX_ERROR; } file->sys_offset = offset; } n = write(file->fd, buf, size); if (n == -1) { ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "write() failed"); return NGX_ERROR; } if ((size_t) n != size) { ngx_log_error(NGX_LOG_CRIT, file->log, 0, "write() has written only %z of %uz", n, size); return NGX_ERROR; } file->sys_offset += n; #endif file->offset += n; return n; } ngx_fd_t ngx_open_tempfile(u_char *name, ngx_uint_t persistent) { ngx_fd_t fd; fd = open((const char *) name, O_CREAT|O_EXCL|O_RDWR, 0600); if (fd != -1 && !persistent) { unlink((const char *) name); } return fd; } #define NGX_IOVS 8 ssize_t ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl, off_t offset, ngx_pool_t *pool) { u_char *prev; size_t size; ssize_t n; ngx_array_t vec; struct iovec *iov, iovs[NGX_IOVS]; /* use pwrite() if there is the only buf in a chain */ if (cl->next == NULL) { return ngx_write_file(file, cl->buf->pos, (size_t) (cl->buf->last - cl->buf->pos), offset); } vec.elts = iovs; vec.size = sizeof(struct iovec); vec.nalloc = NGX_IOVS; vec.pool = pool; do { prev = NULL; iov = NULL; size = 0; vec.nelts = 0; /* create the iovec and coalesce the neighbouring bufs */ while (cl && vec.nelts < IOV_MAX) { if (prev == cl->buf->pos) { iov->iov_len += cl->buf->last - cl->buf->pos; } else { iov = ngx_array_push(&vec); if (iov == NULL) { return NGX_ERROR; } iov->iov_base = (void *) cl->buf->pos; iov->iov_len = cl->buf->last - cl->buf->pos; } size += cl->buf->last - cl->buf->pos; prev = cl->buf->last; cl = cl->next; } /* use pwrite() if there is the only iovec buffer */ if (vec.nelts == 1) { iov = vec.elts; return ngx_write_file(file, (u_char *) iov[0].iov_base, iov[0].iov_len, offset); } if (file->sys_offset != offset) { if (lseek(file->fd, offset, SEEK_SET) == -1) { ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed"); return NGX_ERROR; } file->sys_offset = offset; } n = writev(file->fd, vec.elts, vec.nelts); if (n == -1) { ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "writev() failed"); return NGX_ERROR; } if ((size_t) n != size) { ngx_log_error(NGX_LOG_CRIT, file->log, 0, "writev() has written only %z of %uz", n, size); return NGX_ERROR; } file->sys_offset += n; file->offset += n; } while (cl); return n; } ngx_int_t ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir) { dir->dir = opendir((const char *) name->data); if (dir->dir == NULL) { return NGX_ERROR; } dir->valid_info = 0; return NGX_OK; }