diff options
Diffstat (limited to 'lib/libc/gen/err.3')
| -rw-r--r-- | lib/libc/gen/err.3 | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/libc/gen/err.3 b/lib/libc/gen/err.3 index 088ead71239b..70a214152a19 100644 --- a/lib/libc/gen/err.3 +++ b/lib/libc/gen/err.3 @@ -114,6 +114,22 @@ preceded by another colon and space unless the argument is .Dv NULL . .Pp +If the kernel returned an extended error string in addition to the +.Va errno +code, the +.Fn err +function prints the string with interpolated values for parameters, +as provided to the corresponding invocation of +.Xr EXTERROR 9 . +If the extended error string was not provided, but extended error +information was, or even if string was provided and the +.Ev EXTERROR_VERBOSE +environment variable is present, an additional report is printed. +The report includes at least the category of the error, the name of +the source file (if known by the used version of libc), +the source line number, and parameters. +The format of the printed string is not contractual and might be changed. +.Pp In the case of the .Fn errc , .Fn verrc , |