Hi, I learnt and taught C programming many years ago, I'm now trying to resurect my skills, and have been using GCC for about a month. I've had no problems until this weekend. I'm failing to read a binary file which I can access quite successfully using Editors or Hex-Editors. However fread(), read() fscanf() etc. etc return nothing, not even an error message. I'm beginning to wonder if the file is locked, So am trying to unlock it using 'int locking(int,int,long) ' But GCC fails to find locking.h. I've tried #include <locking.h> and #include <sys\locking.h> to no avail. I can find locking .h in C:\cygwin\usr\include, BUT is that where GCC looks? OR can anyone suggest some other reasons why my 'reads' are failingl? Please - Help me! I'm drowning! JJ -- View this message in context: http://gcc.1065356.n5.nabble.com/locking-h-tp935826.html Sent from the gcc - Help mailing list archive at Nabble.com.