cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration sys_socket/sockatmark.c -o sys_socket/sockatmark -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
sys_socket/sockatmark.c: In function 'main':
sys_socket/sockatmark.c:41:22: error: implicit declaration of function 'sockatmark' [-Werror=implicit-function-declaration]
   41 |         int atmark = sockatmark(client_fd);
      |                      ^~~~~~~~~~
cc1: some warnings being treated as errors