94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
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/* Copyright libuv contributors. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "uv.h"
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#include "internal.h"
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#include <sys/stat.h>
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#include <unistd.h>
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static uv_once_t once = UV_ONCE_INIT;
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static int status;
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int uv__random_readpath(const char* path, void* buf, size_t buflen) {
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struct stat s;
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size_t pos;
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ssize_t n;
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int fd;
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fd = uv__open_cloexec(path, O_RDONLY);
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if (fd < 0)
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return fd;
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if (fstat(fd, &s)) {
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uv__close(fd);
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return UV__ERR(errno);
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}
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if (!S_ISCHR(s.st_mode)) {
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uv__close(fd);
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return UV_EIO;
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}
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for (pos = 0; pos != buflen; pos += n) {
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do
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n = read(fd, (char*) buf + pos, buflen - pos);
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while (n == -1 && errno == EINTR);
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if (n == -1) {
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uv__close(fd);
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return UV__ERR(errno);
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}
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if (n == 0) {
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uv__close(fd);
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return UV_EIO;
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}
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}
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uv__close(fd);
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return 0;
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}
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static void uv__random_devurandom_init(void) {
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char c;
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/* Linux's random(4) man page suggests applications should read at least
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* once from /dev/random before switching to /dev/urandom in order to seed
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* the system RNG. Reads from /dev/random can of course block indefinitely
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* until entropy is available but that's the point.
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*/
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status = uv__random_readpath("/dev/random", &c, 1);
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}
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int uv__random_devurandom(void* buf, size_t buflen) {
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uv_once(&once, uv__random_devurandom_init);
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if (status != 0)
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return status;
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return uv__random_readpath("/dev/urandom", buf, buflen);
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}
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