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getpwuid_r
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/functions/getpwuid_r.html
Gnulib module: extensions
Portability problems fixed by Gnulib:
_POSIX_PTHREAD_SEMANTICS
is not defined).
Portability problems not fixed by Gnulib:
fork
and exec
if
the parent process is multi-threaded. Use it prior to forking.