Hi Maciej, On 9/11/2023 11:32 PM, Maciej Wieczór-Retman wrote: > On 2023-09-11 at 09:59:06 -0700, Reinette Chatre wrote: >> Hi Maciej, >> When I build the tests with this applied I encounter the following: >> >> resctrlfs.c: In function ‘write_schemata’: >> resctrlfs.c:475:14: warning: implicit declaration of function ‘open’; did you mean ‘popen’? [-Wimplicit-function-declaration] >> 475 | fd = open(controlgroup, O_WRONLY); >> | ^~~~ >> | popen >> resctrlfs.c:475:33: error: ‘O_WRONLY’ undeclared (first use in this function) >> 475 | fd = open(controlgroup, O_WRONLY); >> | ^~~~~~~~ >> resctrlfs.c:475:33: note: each undeclared identifier is reported only once for each function it appears in > > Hmm, that's odd. How do you build the tests? I applied this series on top of kselftest repo's "next" branch. I use a separate build directory and first ran "make headers". After that, $ make O=<build dir> -C tools/testing/selftests/resctrl > I use "make -C tools/testing/selftests/resctrl" while in the root kernel > source directory. I tried to get the same error you experienced by > compiling some dummy test program with "open" and "O_WRONLY". From the > experiment I found that the "resctrl.h" header provides the declarations > that are causing your errors. >From what I can tell resctrl.h does not include fcntl.h that provides what is needed. Reinette
