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BASICS OF LIBUV
Basics of libuv¶. libuv enforces an asynchronous, event-driven style of programming. Its core job is to provide an event loop and callback based notifications of I/O and other activities. libuv offers core utilities like timers, non-blocking networking support, asynchronousfile
WELCOME TO THE LIBUV DOCUMENTATION Overview ¶. libuv is a multi-platform support library with a focus on asynchronous I/O. It was primarily developed for use by Node.js, but it’s also used by Luvit , Julia, pyuv, and others.DESIGN OVERVIEW
Design overview. ¶. libuv is cross-platform support library which was originally written for Node.js. It’s designed around the event-driven asynchronous I/O model. The library provides much more than a simple abstraction over different I/O polling mechanisms: ‘handles’ and ‘streams’ provide a high level abstraction forsockets and
NETWORKING — LIBUV DOCUMENTATION Networking. ¶. Networking in libuv is not much different from directly using the BSD socket interface, some things are easier, all are non-blocking, but the concepts stay the same. In addition libuv offers utility functions to abstract the annoying, repetitive and low-level tasks like setting up sockets using the BSD socketstructures, DNS
UV_LOOP_T — EVENT LOOP — LIBUV DOCUMENTATION int uv_loop_close(uv_loop_t *loop) ¶. Releases all internal loop resources. Call this function only when the loop has finished executing and all open handles and requests have been closed, or it will return UV_EBUSY. After this function returns, the user can free the memory allocated for the loop. uv_loop_t *uv_default_loop(void).
MISCELLANEOUS UTILITIES Warning. Don’t call libuv functions after calling uv_library_shutdown (). uv_buf_t uv_buf_init(char *base, unsigned int len) ¶. Constructor for uv_buf_t. Due to platform differences the user cannot rely on the ordering of the base and len members of the uv_buf_t struct. The user is responsible for freeing base after theuv_buf_t is done.
UV_TCP_T — TCP HANDLE — LIBUV DOCUMENTATION int uv_tcp_init_ex(uv_loop_t *loop, uv_tcp_t *handle, unsigned int flags) ¶. Initialize the handle with the specified flags. At the moment only the lower 8 bits of the flags parameter are used as the socket domain. A socket will be created for the given domain. If the specified domain is AF_UNSPEC no socket is created, just likeuv_tcp_init ().
UV_POLL_T — POLL HANDLE — LIBUV DOCUMENTATION uv_poll_t. — Poll handle. ¶. Poll handles are used to watch file descriptors for readability, writability and disconnection similar to the purpose of poll (2). The purpose of poll handles is to enable integrating external libraries that rely on the event loop to signal it about the socket status changes, like c UV_PIPE_T — PIPE HANDLE — LIBUV DOCUMENTATION API¶ int uv_pipe_init (uv_loop_t * loop, uv_pipe_t * handle, int ipc) . Initialize a pipe handle. The ipc argument is a boolean to indicate if this pipe will be used for handle passing between processes (which may change the bytes on the wire). Only a connected pipe that will be passing the handles should have this flag set, not the listening pipe that uv_accept is called on. LIBUV | CROSS-PLATFORM ASYNCHRONOUS I/O libuv, a platform abstraction library with focus on asynchronous i/o. Asynchronous I/O made simple. libuv is a multi-platform support library with a focus on asynchronous I/O.BASICS OF LIBUV
Basics of libuv¶. libuv enforces an asynchronous, event-driven style of programming. Its core job is to provide an event loop and callback based notifications of I/O and other activities. libuv offers core utilities like timers, non-blocking networking support, asynchronousfile
WELCOME TO THE LIBUV DOCUMENTATION Overview ¶. libuv is a multi-platform support library with a focus on asynchronous I/O. It was primarily developed for use by Node.js, but it’s also used by Luvit , Julia, pyuv, and others.DESIGN OVERVIEW
Design overview. ¶. libuv is cross-platform support library which was originally written for Node.js. It’s designed around the event-driven asynchronous I/O model. The library provides much more than a simple abstraction over different I/O polling mechanisms: ‘handles’ and ‘streams’ provide a high level abstraction forsockets and
NETWORKING — LIBUV DOCUMENTATION Networking. ¶. Networking in libuv is not much different from directly using the BSD socket interface, some things are easier, all are non-blocking, but the concepts stay the same. In addition libuv offers utility functions to abstract the annoying, repetitive and low-level tasks like setting up sockets using the BSD socketstructures, DNS
UV_LOOP_T — EVENT LOOP — LIBUV DOCUMENTATION int uv_loop_close(uv_loop_t *loop) ¶. Releases all internal loop resources. Call this function only when the loop has finished executing and all open handles and requests have been closed, or it will return UV_EBUSY. After this function returns, the user can free the memory allocated for the loop. uv_loop_t *uv_default_loop(void).
MISCELLANEOUS UTILITIES Warning. Don’t call libuv functions after calling uv_library_shutdown (). uv_buf_t uv_buf_init(char *base, unsigned int len) ¶. Constructor for uv_buf_t. Due to platform differences the user cannot rely on the ordering of the base and len members of the uv_buf_t struct. The user is responsible for freeing base after theuv_buf_t is done.
UV_TCP_T — TCP HANDLE — LIBUV DOCUMENTATION int uv_tcp_init_ex(uv_loop_t *loop, uv_tcp_t *handle, unsigned int flags) ¶. Initialize the handle with the specified flags. At the moment only the lower 8 bits of the flags parameter are used as the socket domain. A socket will be created for the given domain. If the specified domain is AF_UNSPEC no socket is created, just likeuv_tcp_init ().
UV_POLL_T — POLL HANDLE — LIBUV DOCUMENTATION uv_poll_t. — Poll handle. ¶. Poll handles are used to watch file descriptors for readability, writability and disconnection similar to the purpose of poll (2). The purpose of poll handles is to enable integrating external libraries that rely on the event loop to signal it about the socket status changes, like c UV_PIPE_T — PIPE HANDLE — LIBUV DOCUMENTATION API¶ int uv_pipe_init (uv_loop_t * loop, uv_pipe_t * handle, int ipc) . Initialize a pipe handle. The ipc argument is a boolean to indicate if this pipe will be used for handle passing between processes (which may change the bytes on the wire). Only a connected pipe that will be passing the handles should have this flag set, not the listening pipe that uv_accept is called on. WELCOME TO THE LIBUV DOCUMENTATION Overview ¶. libuv is a multi-platform support library with a focus on asynchronous I/O. It was primarily developed for use by Node.js, but it’s also used by Luvit , Julia, pyuv, and others.LIBUV DOCUMENTATION
CHAPTER 1 Overview libuv is a multi-platform support library with a focus on asynchronous I/O. It was primarily developed for use by Node.js, but it’s also used byLuvit,Julia,pyuv, andothers. MISCELLANEOUS UTILITIES Warning. Don’t call libuv functions after calling uv_library_shutdown (). uv_buf_t uv_buf_init(char *base, unsigned int len) ¶. Constructor for uv_buf_t. Due to platform differences the user cannot rely on the ordering of the base and len members of the uv_buf_t struct. The user is responsible for freeing base after theuv_buf_t is done.
UTILITIES — LIBUV DOCUMENTATION Utilities¶. This chapter catalogues tools and techniques which are useful for common tasks. The libev man page already covers some patterns which can be adopted to libuv through simple API changes. It also covers parts of the libuv API that don’t require entire chapters dedicated to them.UV_STREAM_T
Warning. Relying too much on this API is not recommended. It is likely to change significantly in the future. Currently only works on Windows for uv_pipe_t handles. On UNIX platforms, all uv_stream_t handles are supported.. Also libuv currently makes no ordering guarantee when the blocking mode is changed after write requests have already beensubmitted.
VERSION-CHECKING MACROS AND FUNCTIONS Version-checking macros and functions. ¶. Starting with version 1.0.0 libuv follows the semantic versioning scheme. This means that new APIs can be introduced throughout the lifetime of a major release. In this section you’ll find all macros and functions that will allow you to write or compile code conditionally, in order to work with DNS UTILITY FUNCTIONS If successful, the callback will get called sometime in the future with the lookup result, which is either: status == 0, the res argument points to a valid struct addrinfo, or. status < 0, the res argument is NULL. See the UV_EAI_* constants. Call uv_freeaddrinfo () to free theaddrinfo structure.
UV_IDLE_T — IDLE HANDLE — LIBUV DOCUMENTATION int uv_idle_start(uv_idle_t *idle, uv_idle_cb cb) ¶. Start the handle with the given callback. This function always succeeds, except when cb is NULL. Returns. 0 on success, or UV_EINVAL when cb == NULL. int uv_idle_stop(uv_idle_t *idle) ¶. Stop the handle, the callback willno
UV_CHECK_T — CHECK HANDLE — LIBUV DOCUMENTATION int uv_check_start( uv_check_t * check, uv_check_cb cb) ¶. Start the handle with the given callback. This function always succeeds, except when cb is NULL. Returns: 0 on success, or UV_EINVAL when cb == NULL. int uv_check_stop( uv_check_t * check) ¶. Stop the handle, the callback will no longer be called. This function always succeeds. THREAD POOL WORK SCHEDULING Thread pool work scheduling. ¶. libuv provides a threadpool which can be used to run user code and get notified in the loop thread. This thread pool is internally used to run all file system operations, as well as getaddrinfo and getnameinfo requests. Its default size is 4, but it can be changed at startup time by setting the UV_THREADPOOL LIBUV | CROSS-PLATFORM ASYNCHRONOUS I/OLIBUV CLIENTLIBUV JAVA libuv, a platform abstraction library with focus on asynchronous i/o. Asynchronous I/O made simple. libuv is a multi-platform support library with a focus on asynchronous I/O.BASICS OF LIBUV
Basics of libuv¶. libuv enforces an asynchronous, event-driven style of programming. Its core job is to provide an event loop and callback based notifications of I/O and other activities. libuv offers core utilities like timers, non-blocking networking support, asynchronousfile
WELCOME TO THE LIBUV DOCUMENTATION Features¶. Full-featured event loop backed by epoll, kqueue, IOCP, event ports. Asynchronous TCP and UDP sockets. Asynchronous DNS resolution. Asynchronous file and file system operations NETWORKING — LIBUV DOCUMENTATION UDP¶. The User Datagram Protocol offers connectionless, unreliable network communication. Hence libuv doesn’t offer a stream. Instead libuv provides non-blocking UDP support via the uv_udp_t handle (for receiving) and uv_udp_send_t request (for sending) and related functions. That said, the actual API for reading/writing is very similar to normal stream reads.DESIGN OVERVIEW
Handles and requests¶. libuv provides users with 2 abstractions to work with, in combination with the event loop: handles and requests. Handles represent long-lived objects capable of performing certain operations while active.UV_STREAM_T
Warning. Relying too much on this API is not recommended. It is likely to change significantly in the future. Currently only works on Windows for uv_pipe_t handles. On UNIX platforms, all uv_stream_t handles are supported.. Also libuv currently makes no ordering guarantee when the blocking mode is changed after write requests have already beensubmitted.
MISCELLANEOUS UTILITIES int uv_if_indextoiid (unsigned int ifindex, char * buffer, size_t * size) ¶. Retrieves a network interface identifier suitable for use in an IPv6 scoped address. On Windows, returns the numeric ifindex as a string. On all other platforms, uv_if_indextoname() is called. The result is written to buffer, with *size indicating the length of buffer.If buffer is not large enough to hold the result UV_LOOP_T — EVENT LOOP — LIBUV DOCUMENTATION uv_loop_t — Event loop¶. The event loop is the central part of libuv’s functionality. It takes care of polling for i/o and scheduling callbacks to be run based on different sources of events. UV_TCP_T — TCP HANDLE — LIBUV DOCUMENTATION API¶ int uv_tcp_init (uv_loop_t * loop, uv_tcp_t * handle) ¶. Initialize the handle. No socket is created as of yet. int uv_tcp_init_ex (uv_loop_t * loop, uv_tcp_t * handle, unsigned int flags) ¶. Initialize the handle with the specified flags. At the moment only the lower 8 bits of the flags parameter are used as the socket domain. A socket will be created for the given domain. UV_POLL_T — POLL HANDLE — LIBUV DOCUMENTATIONLIBUV DOCUMENTLIBUV HTTPSLIBUV PDFLIBUV TUTORIAL Note. If one of the events UV_READABLE or UV_WRITABLE are set, the callback will be called again, as long as the given fd/socket remains readable or writable accordingly. Particularly in each of the following scenarios: The callback has been called because the socket became readable/writable and the callback did not conduct a read/write on this socket at all. LIBUV | CROSS-PLATFORM ASYNCHRONOUS I/OLIBUV CLIENTLIBUV JAVA libuv, a platform abstraction library with focus on asynchronous i/o. Asynchronous I/O made simple. libuv is a multi-platform support library with a focus on asynchronous I/O.BASICS OF LIBUV
Basics of libuv¶. libuv enforces an asynchronous, event-driven style of programming. Its core job is to provide an event loop and callback based notifications of I/O and other activities. libuv offers core utilities like timers, non-blocking networking support, asynchronousfile
WELCOME TO THE LIBUV DOCUMENTATION Features¶. Full-featured event loop backed by epoll, kqueue, IOCP, event ports. Asynchronous TCP and UDP sockets. Asynchronous DNS resolution. Asynchronous file and file system operations NETWORKING — LIBUV DOCUMENTATION UDP¶. The User Datagram Protocol offers connectionless, unreliable network communication. Hence libuv doesn’t offer a stream. Instead libuv provides non-blocking UDP support via the uv_udp_t handle (for receiving) and uv_udp_send_t request (for sending) and related functions. That said, the actual API for reading/writing is very similar to normal stream reads.DESIGN OVERVIEW
Handles and requests¶. libuv provides users with 2 abstractions to work with, in combination with the event loop: handles and requests. Handles represent long-lived objects capable of performing certain operations while active.UV_STREAM_T
Warning. Relying too much on this API is not recommended. It is likely to change significantly in the future. Currently only works on Windows for uv_pipe_t handles. On UNIX platforms, all uv_stream_t handles are supported.. Also libuv currently makes no ordering guarantee when the blocking mode is changed after write requests have already beensubmitted.
MISCELLANEOUS UTILITIES int uv_if_indextoiid (unsigned int ifindex, char * buffer, size_t * size) ¶. Retrieves a network interface identifier suitable for use in an IPv6 scoped address. On Windows, returns the numeric ifindex as a string. On all other platforms, uv_if_indextoname() is called. The result is written to buffer, with *size indicating the length of buffer.If buffer is not large enough to hold the result UV_LOOP_T — EVENT LOOP — LIBUV DOCUMENTATION uv_loop_t — Event loop¶. The event loop is the central part of libuv’s functionality. It takes care of polling for i/o and scheduling callbacks to be run based on different sources of events. UV_TCP_T — TCP HANDLE — LIBUV DOCUMENTATION API¶ int uv_tcp_init (uv_loop_t * loop, uv_tcp_t * handle) ¶. Initialize the handle. No socket is created as of yet. int uv_tcp_init_ex (uv_loop_t * loop, uv_tcp_t * handle, unsigned int flags) ¶. Initialize the handle with the specified flags. At the moment only the lower 8 bits of the flags parameter are used as the socket domain. A socket will be created for the given domain. UV_POLL_T — POLL HANDLE — LIBUV DOCUMENTATIONLIBUV DOCUMENTLIBUV HTTPSLIBUV PDFLIBUV TUTORIAL Note. If one of the events UV_READABLE or UV_WRITABLE are set, the callback will be called again, as long as the given fd/socket remains readable or writable accordingly. Particularly in each of the following scenarios: The callback has been called because the socket became readable/writable and the callback did not conduct a read/write on this socket at all. WELCOME TO THE LIBUV DOCUMENTATION Features¶. Full-featured event loop backed by epoll, kqueue, IOCP, event ports. Asynchronous TCP and UDP sockets. Asynchronous DNS resolution. Asynchronous file and file system operations NETWORKING — LIBUV DOCUMENTATION UDP¶. The User Datagram Protocol offers connectionless, unreliable network communication. Hence libuv doesn’t offer a stream. Instead libuv provides non-blocking UDP support via the uv_udp_t handle (for receiving) and uv_udp_send_t request (for sending) and related functions. That said, the actual API for reading/writing is very similar to normal stream reads.INTRODUCTION
Introduction¶. This ‘book’ is a small set of tutorials about using libuv as a high performance evented I/O library which offers the same API on Windows and Unix.. It is meant to cover the main areas of libuv, but is not a comprehensive reference discussing every functionand data structure.
THREADS — LIBUV DOCUMENTATION The thread function will be launched in a separate thread, passed the uv_work_t structure and once the function returns, the after function will be called on the thread the event loop is running in. It will be passed the same structure. For writing wrappers to blocking libraries, a common pattern is to use a baton to exchange data.. Since libuv version 0.9.4 an additional function, uv_cancel PROCESSES — LIBUV DOCUMENTATION The uv_process_t struct only acts as the handle, all options are set via uv_process_options_t.To simply launch a process, you need to set only the file and args fields. file is the program to execute. Since uv_spawn uses execvp(3) internally, there is no need to supply the full path. Finally as per underlying conventions, the arguments array has to be one larger than the number of argumentsAPI DOCUMENTATION
API documentation¶. Error handling; Version-checking macros and functions; uv_loop_t — Event loop; uv_handle_t — Base handle; uv_req_t — Base request; uv_timerUV_SIGNAL_T
Unix notes¶. SIGKILL and SIGSTOP are impossible to catch. Handling SIGBUS, SIGFPE, SIGILL or SIGSEGV via libuv results into undefined behavior. SIGABRT will not be caught by libuv if generated by abort(), e.g. through assert().. On Linux SIGRT0 and SIGRT1 (signals 32 and 33) are used by the NPTL pthreads library to manage threads. VERSION-CHECKING MACROS AND FUNCTIONS Version-checking macros and functions¶. Starting with version 1.0.0 libuv follows the semantic versioning scheme. This means that new APIscan be introduced
UV_PIPE_T — PIPE HANDLE — LIBUV DOCUMENTATION API¶ int uv_pipe_init (uv_loop_t * loop, uv_pipe_t * handle, int ipc) . Initialize a pipe handle. The ipc argument is a boolean to indicate if this pipe will be used for handle passing between processes (which may change the bytes on the wire). Only a connected pipe that will be passing the handles should have this flag set, not the listening pipe that uv_accept is called on. THREAD POOL WORK SCHEDULING Thread pool work scheduling¶. libuv provides a threadpool which can be used to run user code and get notified in the loop thread. This thread pool is internally used to run all file system operations, as well as getaddrinfo and getnameinfo requests.LIBUV
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ASYNCHRONOUS I/O MADE SIMPLE. libuv is a multi-platform support library with a focus on asynchronousI/O.
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