fdalloc            62 kernel/sysfile.c   if((fd=fdalloc(f)) < 0)
fdalloc           344 kernel/sysfile.c   if((f = filealloc()) == 0 || (fd = fdalloc(f)) < 0){
fdalloc           489 kernel/sysfile.c   if((fd0 = fdalloc(rf)) < 0 || (fd1 = fdalloc(wf)) < 0){