diff options
| author | Alexander Leidinger <netchild@FreeBSD.org> | 2026-07-21 20:39:56 +0000 |
|---|---|---|
| committer | Alexander Leidinger <netchild@FreeBSD.org> | 2026-07-21 20:50:37 +0000 |
| commit | c8db6d4b63f18c81557628ad0d3f715bea46cc99 (patch) | |
| tree | 68281e3c49c601f2f74b1fd80259c5077a5e0a2b | |
| parent | d4ddf8eaee9371d1d20bfb753237f25505d6afee (diff) | |
exterror: advertise error strings via kern.features.exterr_strings
Allow userland, in particular test cases for EXTERROR conversions,
to detect at run time whether extended errors include the
descriptive message strings, which depends on the EXTERR_STRINGS
kernel option and cannot be probed in any other way.
Reviewed by: kib
MFC after: 1 week
Assisted-by: Claude Code (Fable 5)
Differential Revision: https://reviews.freebsd.org/D58321
| -rw-r--r-- | share/man/man9/exterror.9 | 13 | ||||
| -rw-r--r-- | sys/kern/sys_generic.c | 4 |
2 files changed, 16 insertions, 1 deletions
diff --git a/share/man/man9/exterror.9 b/share/man/man9/exterror.9 index 47ffda065d43..2c9dc73f7616 100644 --- a/share/man/man9/exterror.9 +++ b/share/man/man9/exterror.9 @@ -6,7 +6,7 @@ .\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship .\" from the FreeBSD Foundation. .\" -.Dd November 5, 2025 +.Dd July 21, 2026 .Dt EXTERROR 9 .Os .Sh NAME @@ -171,6 +171,17 @@ were modified to print the extended information if it is available in addition to the usual .Va errno decoding. +.Pp +Kernels built with the +.Cd option EXTERR_STRINGS +advertise the +.Va kern.features.exterr_strings +.Xr sysctl 8 +variable, see +.Xr feature_present 3 , +indicating that the reported errors include the descriptive message strings. +Without it, only the numeric information (error code, category, +source line number and parameters) is available. .Sh ASYNCHRONOUS INPUT/OUTPUT Due to the nature of the .Fx diff --git a/sys/kern/sys_generic.c b/sys/kern/sys_generic.c index c16e806e0bd7..5d356a26359b 100644 --- a/sys/kern/sys_generic.c +++ b/sys/kern/sys_generic.c @@ -112,6 +112,10 @@ static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer"); static MALLOC_DEFINE(M_SELECT, "select", "select() buffer"); MALLOC_DEFINE(M_IOV, "iov", "large iov's"); +#ifdef EXTERR_STRINGS +FEATURE(exterr_strings, "Extended error reporting includes message strings"); +#endif + static int pollout(struct thread *, struct pollfd *, struct pollfd *, u_int); static int pollscan(struct thread *, struct pollfd *, u_int); |