m conversion specifier is not C but is a GNU extension to printf: From GNU documentation: http://www.gnu.org/software/libc/manual/html_node/Other-Output-Conversions.html The ‘%m’ conversion prints the string corresponding to the error code in errno. See Error Messages. Thus: fprintf (stderr, “can’t open `%s’: %m\n”, filename); is equivalent to: fprintf (stderr, “can’t open `%s’: %s\n”, filename, strerror (errno)); The ‘%m’ … Read more
It means that your given host name ‘ ‘ is invalid (gai stands for getaddrinfo()). As NPE already states, maybe an empty string ” would be more appropriate than a space ‘ ‘.
The problem obviously was (as you figured it out) that port 36250 wasn’t open on the server side at the time you tried to connect (hence connection refused). I can see the server was supposed to open this socket after receiving SEND command on another connection, but it apparently was “not opening [it] up in … Read more
Quick Fix If you just want to drop the database no matter what (but please first read the whole post: the error was given for a reason, and it might be important to know what the reason was!), you can: find the datadir with the command SHOW VARIABLES WHERE Variable_name LIKE ‘%datadir%’; stop the MySQL … Read more
Yes, it is intended. Here you can read detailed explanation. It is possible to override this behavior by setting SO_REUSEADDR option on a socket. For example: sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
Use: File.open(“out.txt”, [your-option-string]) {|f| f.write(“write your stuff here”) } where your options are: r – Read only. The file must exist. w – Create an empty file for writing. a – Append to a file.The file is created if it does not exist. r+ – Open a file for update both reading and writing. The … Read more
You can use strerror() to get a human-readable string for the error number. This is the same string printed by perror() but it’s useful if you’re formatting the error message for something other than standard error output. For example: #include <errno.h> #include <string.h> /* … */ if(read(fd, buf, 1)==-1) { printf(“Oh dear, something went wrong … Read more