ares_process - Process events for name resolution
#include <ares.h> void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds) void ares_process_fd(ares_channel channel, ares_socket_t read_fd, ares_socket_t write_fd)
ARES_PROCESS(3) Library Functions Manual ARES_PROCESS(3) NAME ares_process - Process events for name resolution SYNOPSIS #include <ares.h> void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds) void ares_process_fd(ares_channel channel, ares_socket_t read_fd, ares_socket_t write_fd) DESCRIPTION The ares_process(3) function handles input/output events and timeouts associated with queries pending on the name service channel identified by channel. The file descriptor sets pointed to by read_fds and write_fds should have file descriptors set in them according to whether the file descriptors specified by ares_fds(3) are ready for reading and writing. (The easiest way to determine this information is to invoke select(3) with a timeout no greater than the timeout given by ares_timeout(3)). The ares_process(3) function will invoke callbacks for pending queries if they complete successfully or fail. ares_process_fd(3) works the same way but acts and operates only on the specific file descriptors (sockets) you pass in to the function. Use ARES_SOCKET_BAD for "no action". This function is provided to allow users of c-ares to void select(3) in their applications and within c- ares. To only process possible timeout conditions without a socket event occurring, one may pass NULL as the values for both read_fds and write_fds for ares_process(3), or ARES_SOCKET_BAD for both read_fd and write_fd for ares_process_fd(3). EXAMPLE The following code fragment waits for all pending queries on a channel to complete: int nfds, count; fd_set readers, writers; struct timeval tv, *tvp; while (1) { FD_ZERO(&readers); FD_ZERO(&writers); nfds = ares_fds(channel, &readers, &writers); if (nfds == 0) break; tvp = ares_timeout(channel, NULL, &tv); count = select(nfds, &readers, &writers, NULL, tvp); ares_process(channel, &readers, &writers); } ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | library/libcares | +---------------+------------------+ |Stability | Volatile | +---------------+------------------+ SEE ALSO ares_fds(3), ares_timeout(3) AUTHOR Greg Hudson, MIT Information Systems Copyright 1998 by the Massachusetts Institute of Technology. NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://c-ares.haxx.se/download/c- ares-1.17.2.tar.gz. Further information about this software can be found on the open source community website at https://c-ares.haxx.se/. 25 July 1998 ARES_PROCESS(3)