id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,difficulty 819,file-mkstemp on windows is broken,Jim Ursetto,,"posixwin.scm file-mkstemp utilizes C_mkstemp which is defined as #define C_mkstemp(t) C_fix(mktemp(C_c_string(t))) However mktemp returns a char* pointer to the updated template, not an FD as file-mkstemp expects. It seems that mkstemp() was just changed to mktemp() on Windows without checking if it does the same thing. In my tests on mingw, the template requires exactly 6 Xs. Otherwise it will return NULL (which is translated to FD 0). On success it returns a pointer which is translated to a nonsense FD. {{{ #;1> (file-mkstemp ""test.XXX"") 0 ""test.960"" ; 2 values #;1> (file-mkstemp ""test.XXXXXX"") 2253780 ""test.a01960"" ; 2 values }}} I think file-mkstemp should throw unimplemented error on Windows instead. Alternatively it could probably be implemented by using mktemp and file-open with (+ open/creat open/excl) in a loop, but you have to get the permissions right and I'm sure there are even more hairy details.",defect,closed,minor,4.10.0,core libraries,4.7.x,fixed,,,