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
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
I’m aware of two compelling projects: posix for Java (based on JNI) [derived from Jython] jna-posix (based on JNA) [derived from JRuby] Personally I like very much JNA. Take a look at this example of mine, mapping link(2): import com.sun.jna.Library; import com.sun.jna.Native; class Link { private static final C c = (C) Native.loadLibrary(“c”, C.class); private … Read more
glibc uses libnss to support a number of different providers for address resolution services. Unfortunately, you cannot statically link libnss, as exactly what providers it loads depends on the local system’s configuration.
There is not a system call to do it for you, unfortunately. I’m guessing that’s because there isn’t a way to have really well-defined semantics for what should happen in error cases. Should it leave the directories that have already been created? Delete them? What if the deletions fail? And so on… It is pretty … Read more
There are two common kinds of SEGV, which is an error that results from an invalid memory access: A page was accessed which had the wrong permissions. E.g., it was read-only but your code tried to write to it. This will be reported as SEGV_ACCERR. A page was accessed that is not even mapped into … Read more
Add -lrt to the end of g++ command line. This links in the librt.so “Real Time” shared library.