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Diffstat (limited to 'FAQ.in')
| -rw-r--r-- | FAQ.in | 12 |
1 files changed, 12 insertions, 0 deletions
@@ -1314,6 +1314,18 @@ interface. For compilation with the old API, <db_185.h> has to be included (and not <db.h>) and you can link with either `-ldb1' or `-ldb' for either of the db formats. +?? Autoconf's AC_CHECK_FUNC macro reports that a function exists, but + when I try to use it, it always returns -1 and sets errno to ENOSYS. + +{ZW} You are using a 2.0 Linux kernel, and the function you are trying to +use is only implemented in 2.1/2.2. Libc considers this to be a function +which exists, because if you upgrade to a 2.2 kernel, it will work. One +such function is sigaltstack. + +Your program should check at runtime whether the function works, and +implement a fallback. Note that Autoconf cannot detect unimplemented +functions in other systems' C libraries, so you need to do this anyway. + ? Miscellaneous |