[Minios-devel] [UNIKRAFT PATCH v2 3/3] lib/posix-sysinfo: glibc version workaround for `uname` (prepend 5-)

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

During glibc initialization, the library is doing a `uname` system
call in order to detect the kernel version. It looks into the release
field and parses the string. We prepend (for us meaningless) "5-" to
our version string in order to tell glibc that it runs on a new enough
kernel.

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 lib/posix-sysinfo/sysinfo.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/posix-sysinfo/sysinfo.c b/lib/posix-sysinfo/sysinfo.c
index abcbb79d..2bf2c12a 100644
--- a/lib/posix-sysinfo/sysinfo.c
+++ b/lib/posix-sysinfo/sysinfo.c
@@ -46,7 +46,10 @@
 static struct utsname utsname = {
        .sysname        = "Unikraft",
        .nodename       = "unikraft",
-       .release        = STRINGIFY(UK_CODENAME),
+       /* glibc looks into the release field to check the kernel version:
+        * We prepend '5-' in order to be "new enough" for it.
+        */
+       .release        = "5-" STRINGIFY(UK_CODENAME),
        .version        = STRINGIFY(UK_FULLVERSION),
 #ifdef CONFIG_ARCH_X86_64
        .machine        = "x86_64"
-- 
2.20.1


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