ESP-IDF
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Outline
#include <stddef.h>
#include <sys/poll.h>
#include <sys/select.h>
#include <sys/errno.h>
#include <sys/param.h>
poll(struct pollfd *, nfds_t, int)
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/newlib/poll.c
 
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/* * SPDX-FileCopyrightText: 2019-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <stddef.h> #include <sys/poll.h> #include <sys/select.h> #include <sys/errno.h> #include <sys/param.h>5 includes int poll(struct pollfd *fds, nfds_t nfds, int timeout) { struct timeval tv = { // timeout is in milliseconds .tv_sec = timeout / 1000, .tv_usec = (timeout % 1000) * 1000, }{...}; int max_fd = -1; fd_set readfds; fd_set writefds; fd_set errorfds; struct _reent* r = __getreent(); int ret = 0; if (fds == NULL) { __errno_r(r) = ENOENT; return -1; }{...} FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&errorfds); for (unsigned int i = 0; i < nfds; ++i) { fds[i].revents = 0; if (fds[i].fd < 0) { // revents should remain 0 and events ignored (according to the documentation of poll()). continue; }{...} if (fds[i].fd >= FD_SETSIZE) { fds[i].revents |= POLLNVAL; ++ret; continue; }{...} if (fds[i].events & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) { FD_SET(fds[i].fd, &readfds); FD_SET(fds[i].fd, &errorfds); max_fd = MAX(max_fd, fds[i].fd); }{...} if (fds[i].events & (POLLOUT | POLLWRNORM | POLLWRBAND)) { FD_SET(fds[i].fd, &writefds); FD_SET(fds[i].fd, &errorfds); max_fd = MAX(max_fd, fds[i].fd); }{...} }{...} const int select_ret = select(max_fd + 1, &readfds, &writefds, &errorfds, timeout < 0 ? NULL : &tv); if (select_ret > 0) { ret += select_ret; for (unsigned int i = 0; i < nfds; ++i) { if (FD_ISSET(fds[i].fd, &readfds)) { fds[i].revents |= POLLIN; }{...} if (FD_ISSET(fds[i].fd, &writefds)) { fds[i].revents |= POLLOUT; }{...} if (FD_ISSET(fds[i].fd, &errorfds)) { fds[i].revents |= POLLERR; }{...} }{...} }{...} else { ret = select_ret; // keeping the errno from select() }{...} return ret; }{ ... }
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