172 lines
3.4 KiB
C
172 lines
3.4 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#define _GNU_SOURCE
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#include "core/private.h"
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#include <pwd.h>
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#include <grp.h>
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#ifdef LWS_WITH_PLUGINS
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#include <dlfcn.h>
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#endif
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#include <dirent.h>
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int lws_plat_apply_FD_CLOEXEC(int n)
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{
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if (n == -1)
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return 0;
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return fcntl(n, F_SETFD, FD_CLOEXEC);
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}
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int
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lws_plat_write_file(const char *filename, void *buf, int len)
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{
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int m, fd;
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fd = lws_open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
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if (fd == -1)
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return 1;
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m = write(fd, buf, len);
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close(fd);
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return m != len;
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}
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int
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lws_plat_read_file(const char *filename, void *buf, int len)
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{
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int n, fd = lws_open(filename, O_RDONLY);
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if (fd == -1)
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return -1;
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n = read(fd, buf, len);
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close(fd);
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return n;
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}
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lws_fop_fd_t
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_lws_plat_file_open(const struct lws_plat_file_ops *fops, const char *filename,
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const char *vpath, lws_fop_flags_t *flags)
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{
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struct stat stat_buf;
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int ret = lws_open(filename, (*flags) & LWS_FOP_FLAGS_MASK, 0664);
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lws_fop_fd_t fop_fd;
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if (ret < 0)
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return NULL;
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if (fstat(ret, &stat_buf) < 0)
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goto bail;
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fop_fd = malloc(sizeof(*fop_fd));
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if (!fop_fd)
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goto bail;
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fop_fd->fops = fops;
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fop_fd->flags = *flags;
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fop_fd->fd = ret;
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fop_fd->filesystem_priv = NULL; /* we don't use it */
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fop_fd->len = stat_buf.st_size;
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fop_fd->pos = 0;
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return fop_fd;
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bail:
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close(ret);
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return NULL;
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}
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int
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_lws_plat_file_close(lws_fop_fd_t *fop_fd)
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{
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int fd = (*fop_fd)->fd;
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free(*fop_fd);
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*fop_fd = NULL;
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return close(fd);
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}
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lws_fileofs_t
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_lws_plat_file_seek_cur(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
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{
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lws_fileofs_t r;
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if (offset > 0 &&
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offset > (lws_fileofs_t)fop_fd->len - (lws_fileofs_t)fop_fd->pos)
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offset = fop_fd->len - fop_fd->pos;
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if ((lws_fileofs_t)fop_fd->pos + offset < 0)
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offset = -fop_fd->pos;
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r = lseek(fop_fd->fd, offset, SEEK_CUR);
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if (r >= 0)
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fop_fd->pos = r;
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else
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lwsl_err("error seeking from cur %ld, offset %ld\n",
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(long)fop_fd->pos, (long)offset);
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return r;
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}
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int
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_lws_plat_file_read(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
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uint8_t *buf, lws_filepos_t len)
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{
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long n;
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n = read((int)fop_fd->fd, buf, len);
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if (n == -1) {
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*amount = 0;
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return -1;
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}
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fop_fd->pos += n;
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lwsl_debug("%s: read %ld of req %ld, pos %ld, len %ld\n", __func__, n,
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(long)len, (long)fop_fd->pos, (long)fop_fd->len);
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*amount = n;
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return 0;
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}
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int
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_lws_plat_file_write(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
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uint8_t *buf, lws_filepos_t len)
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{
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long n;
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n = write((int)fop_fd->fd, buf, len);
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if (n == -1) {
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*amount = 0;
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return -1;
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}
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fop_fd->pos += n;
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*amount = n;
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return 0;
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}
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