>> Andrew, you noted a lack of explanation accompanying the original >> patch. Here's something to fill the gap, and which may be suitable >> for the changelog. >> >> == >> Introduce a new accept4() system call. The addition of this system >> call matches analogous changes in 2.6.27 (dup3(), evenfd2(), >> signalfd4(), inotify_init1(), epoll_create1(), pipe2()) which added >> new system calls that differed from analogous traditional system calls >> in adding a flags argument that can be used to access additional >> functionality. The accept4() system call is exactly the same as >> accept(), except that it adds a flags bit-mask argument. Two flags >> are initially implemented. (Most of the new system calls in 2.6.27 >> also had both of these flags.) SOCK_CLOEXEC causes the close-on-exec >> (FD_CLOEXEC) flag to be enabled for the new file descriptor returned >> by accept4(). This is a useful security feature to avoid leaking >> information in a multithreaded program where one thread is doing an >> accept() at the same time as another thread is doing a fork() plus >> exec(). (More details here: >> http://udrepper.livejournal.com/20407.html "Secure File Descriptor >> Handling", Ulrich Drepper) The other flag is SOCK_NONBLOCK, which >> causes the O_NONBLOCK flag to be enabled on the new open file >> description created by accept4(). (This flag is merely a convenience, >> saving the use of additional calls fcntl(F_GETFL) and fcntl (F_SETFL) >> to achieve the same result.) > > I replaced the existing changelog with the above (plus some paragraph > breaks ;)). Will add the new test app when it comes along. Git allows paragraph breaks in changelogs?! You gotta love technology ;-). -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Found a documentation bug? http://www.kernel.org/doc/man-pages/reporting_bugs.html -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
