Struct pollfd. In addition, poll () shall set the POLLHUP, Explore the Unix poll system call for efficient I/O multiplexing. h - definitions for the poll () function SYNOPSIS #include <poll. short events The input event flags (see below). g. The set of file descriptors to be monitored is specified in the fdsargument, which is an array of structures of the following form: 1. linux select () takes 5 parameters, first the highest file descriptor + 1, then a fd_set for read, one for write and one for exceptions. The last parameter is a struct timeval, used for timeout. g, one or the bit represent receive NAME poll. h> int poll (struct pollfd fds[], nfds_t nfds, int timeout); int ppoll (struct pollfd fds[], nfds_t nfds, const struct timespec * restrict timeout, const sigset_t * restrict newsigmask); DESCRIPTION The poll () system call examines a set of file 5 days ago · [lkml] [2026] [Feb] [26] [last100] Views: [wrap] [no wrap] [headers] [forward] Messages in this thread First message in thread Christian Brauner Christian Brauner Christian Brauner Christian Brauner Christian Brauner Christian Brauner Patch in this message Get diff 1 From Christian Brauner <> Date Thu, 26 Feb 2026 14:51:03 +0100 Subject [PATCH v5 5/6] selftests/pidfd: add CLONE_NNP tests Add [yocto] [ptest-runner] [PATCH v2 3/4] utils: Ensure pipes Randy MacLeod man poll (2): poll () は select (2) と同様の仕事を行う、つまり、ファイルディスクリプタ集合のいずれか一つが I/O を実行可能な状態になるのを待つ。 監視するファイルディスクリプタ集合は、 fds 引き数で指定する。 fds は、以下の型の構造体の配列である。 In each pollfd structure, poll () shall clear the revents member, except that where the application requested a report on a condition by setting one of the bits of events listed above, poll () shall set the corresponding bit in revents if the requested condition is true. If this field is negative, then the corresponding events field is ignored and The <poll. The <poll. The pollfd (poll file descriptor) data structure The struct pollfd data structure is as follows: struct pollfd { int fd; // A descriptor (e. PTP IEEE 1588 stack for Linux. . It takes an array of struct pollfd as argument, which specifies the file descriptors, events, and timeout. Mar 22, 2021 · check revents into struct pollfd Ask Question Asked 4 years, 11 months ago Modified 4 years, 11 months ago struct pollfd { int fd; /* file descriptor */ short events; /* requested events */ short revents; /* returned events */ }; The caller should specify the number of items in the fds array in nfds. Mar 22, 2021 · check revents into struct pollfd Ask Question Asked 4 years, 11 months ago Modified 4 years, 11 months ago poll() performs a similar task to select(2): it waits for one of a set of file descriptors to become ready to perform I/O. short revents The output event flags (see below). , socket) short events; // This is a bit array // Each bit represents a certain operation // Set that bit to check for readiness // E. See the man page for details and examples. poll() システムコールはファイル記述子の集合を調査して、 それらのいずれかで入出力の準備ができているか否かを調べます。 fds 引数は <poll. Contribute to ShaquilleLiu/linuxptp development by creating an account on GitHub. h> DESCRIPTION The <poll. The field fd contains a file descriptor for an open file. h> header shall define the following type POLL (2) System Calls Manual POLL (2) NAME poll -- synchronous I/O multiplexing LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <poll. poll(2) is a system call that waits for one of a set of file descriptors to become ready to perform I/O. struct pollfd { int fd; /* file descriptor */ short events; /* requested events */ short rev Explore the Unix poll system call for efficient I/O multiplexing. struct pollfd { int fd; /* file descriptor */ short events; /* requested events */ short revents; /* returned events */ }; The caller should specify the number of items in the fds array in nfds. Understand its features, usage, and examples to enhance your programming skills. h> header shall define the pollfd structure, which shall include at least the following members: int fd The following descriptor being polled. It return -1 on error, 0 on timeout or the number of file descriptors in the sets that are set. h> で定義された pollfd 配列を指すポインタ (後述) です。 nfds 引数は fds 配列のサイズを決定します。 struct pollfd { int fd; /* ファイル記述子 */ short events struct pollfd { int fd; /* file descriptor */ short events; /* requested events */ short revents; /* returned events */ }; The caller should specify the number of items in the fds array in nfds.