To get a fully qualified name for a machine, we must first get the local hostname, and then lookup the canonical name. The easiest way to do this is by first getting the local hostname using uname() or gethostname() and then performing a lookup with gethostbyname() and looking at the h_name member of the struct … Read more
Windows ignores the shebang line #!/usr/bin/env node and will execute it according to the .js file association. Be explicit about calling your script with node node hello.js ps. Pedantry: shebangs aren’t in the POSIX standard but they are supported by most *nix system. If you package your project for Npm, use the ‘bin’ field in … Read more
Fundamentally, because in times now long past, the behaviour of test was more complex and not uniformly defined across different systems (so portable code had to be written carefully to avoid non-portable constructs). In particular, before test was a shell built-in, it was a separate executable (and note that MacOS X still has /bin/test and … Read more
Half a second is 500,000,000 nanoseconds, so your code should read: tim.tv_sec = 0; tim.tv_nsec = 500000000L; As things stand, you code is sleeping for 1.0000005s (1s + 500ns).
The POSIX equivalent for what you described is POSIX condition variables. Note that condition variable must always be used in pair with a POSIX mutex, but quite frequently several condition variables use the same mutex, so if you aren’t going to use the mutex exclusively for the condition variable, you shouldn’t place it in the … Read more
There is a PATH_MAX, but it is a bit problematic. From the bugs section of the realpath(3) man page: The POSIX.1-2001 standard version of this function is broken by design, since it is impossible to determine a suitable size for the output buffer, resolved_path. According to POSIX.1-2001 a buffer of size PATH_MAX suffices, but PATH_MAX … Read more
You get this error message if a Python file was closed from “the outside”, i.e. not from the file object’s close() method: >>> f = open(“.bashrc”) >>> os.close(f.fileno()) >>> del f close failed in file object destructor: IOError: [Errno 9] Bad file descriptor The line del f deletes the last reference to the file object, … Read more
While dealing with redirecting output to a file you may use freopen(). Assuming you are trying to redirect your stdout to a file ‘output.txt‘ then you can write- freopen(“output.txt”, “a+”, stdout); Here “a+” for append mode. If the file exists then the file open in append mode. Otherwise a new file is created. After reopening … Read more
SUA, formerly called INTERIX, is now 100% POSIX compatible. There are a lot of ported apps for it. Even whole Linux distros like Debian have been ported. SUA/Interix comes with Windows 2003R2 and up (including Win7 which has the latest 6.1). I also successfully compiled BASH without it directly supporting SUA. Previously only parts of … Read more
Doing socket I/O efficiently has been solved with kqueue, epoll, IO completion ports and the likes. Doing asynchronous file I/O is sort of a late comer (apart from windows’ overlapped I/O and solaris early support for posix AIO). If you’re looking for doing socket I/O, you’re probably better off using one of the above mechanisms. … Read more