Hi Taking a private discussion public. Aditya is implementing the POSIX method confstr() next. This email is my current set of thoughts on the implementation of this method for RTEMS.
First, I think confstr() belongs in the RTEMS source tree. It is very similar to sysconf() but has to take the following "names" as those to be able to retrieve: _CS_PATH _CS_POSIX_V7_ILP32_OFF32_CFLAGS _CS_POSIX_V7_ILP32_OFF32_LDFLAGS _CS_POSIX_V7_ILP32_OFF32_LIBS _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS _CS_POSIX_V7_ILP32_OFFBIG_LIBS _CS_POSIX_V7_LP64_OFF64_CFLAGS _CS_POSIX_V7_LP64_OFF64_LDFLAGS _CS_POSIX_V7_LP64_OFF64_LIBS _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS _CS_POSIX_V7_LPBIG_OFFBIG_LIBS _CS_POSIX_V7_THREADS_CFLAGS _CS_POSIX_V7_THREADS_LDFLAGS _CS_POSIX_V7_WIDTH_RESTRICTED_ENVS _CS_V7_ENV This is per http://pubs.opengroup.org/onlinepubs/9699919799/functions/confstr.html The value for those #define's should likely match what is in the Linux Software Base: https://refspecs.linuxfoundation.org/LSB_1.2.0/gLSB.html That much goes in newlib. The confstr() implementation will be a switch on those values and I honestly don't even know what most of those should be in an RTEMS environment. But those are the names and we have to answer the question of what is the appropriate value to return. A first implementation could return something like getenv("PATH") for __CS_PATH, and take a swing at the "obvious ones". The ones with CFLAGS, LDFLAGS, and LIBS would first have to evaluated to see if the name makes sense to provide a value for. And then return the value. I am tending to lean to returning empty string for all of those. Looks like Linux doesn't support most of them: http://man7.org/linux/man-pages/man3/confstr.3.html I don't think this is a commonly used method so I would be perfectly happy to support it in a minimal, but compliant manner. Any other thoughts? --joel
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