Thanks Valdis. Yes, I got the kernel and header files installed. But there seems to be a lot of mman.h. I found one in /usr/include/asm-generic that defined MAP_SYNC, and I included it also, now I got passed compile and linking. I'm checking out if the flag does what is is said to do-- I don't have to call msync function, which would boost performance. On Monday, July 16, 2018, 10:04:54 PM EDT, <valdis.kletnieks@vt.edu> wrote: On Tue, 17 Jul 2018 00:57:31 -0000, David Frank said:
I installed LTS 18.04 with headers. I'm trying to use the new flag MAP_SYNC with mmap call, but it complained MAP_SYNC undefined.What #define do I need to enable this?
You need more than a #define. You need a 4.15 kernel and matching kernel-headers. But if you installed 18.04 correctly, those should be in place already, as that apparently shipped with 4.15... Or if you're not really a kernel person, but a misplaced userspace person, 'man 2 mmap' tells us: NAME mmap, munmap - map or unmap files or devices into memory SYNOPSIS #include <sys/mman.h>_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies