cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration unistd/dup3.c -o unistd/dup3 -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
relibc getrlimit(3, 0x7ffffffffc80): not implemented
relibc getrlimit(3, 0x7ffffffffba0): not implemented
relibc getrlimit(9, 0x7ffffffffb60): not implemented
relibc getrlimit(9, 0x7ffffffffb90): not implemented
relibc getrlimit(5, 0x7ffffffffb90): not implemented
relibc getrlimit(9, 0x7ffffffffb60): not implemented
unistd/dup3.c: In function 'main':
unistd/dup3.c:10:14: error: implicit declaration of function 'dup3'; did you mean 'dup2'? [-Werror=implicit-function-declaration]
   10 |         if ( dup3(2, 42, O_CLOEXEC) < 0 )
      |              ^~~~
      |              dup2
cc1: some warnings being treated as errors