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POSIX requires strerror_r to return an int: 0 for success, and an errno value failure. Newlib currently returns char*, (the value of strerror), which is not permitted. See http://www.opengroup.org/onlinepubs/009695399/functions/strerror_r.html. I'm not sure if libc/sys/linux/dl has problems, since its Makefile.am includes AM_CFLAGS of -D__strerror_r=strerror_r, so that should also be visited. Also, strerror in general is not required to be reentrant, but strerror_r is, so I am relying on the documentation of newlib's strerror being thread-safe since (with or without the patch) this implementation of strerror_r calls strerror. Therefore, this patch may not be complete, but it is a start. 2005-03-17 Eric Blake <ebb9@byu.net> * libc/string/strerror_r.c (strerror_r): Return int, not char*, as required by POSIX. * libc/include/string.h (strerror_r): Ditto. * libc/sys/linux/argp/argp-help.c (__argp_failure): Fix caller. -- Eric Blake
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