/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_socket/sendmsg.c -o sys_socket/sendmsg -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -latomic
sys_socket/sendmsg.c:5:51: error: use of undeclared identifier 'sendmsg'; did you mean 'nsendmsg'?
ssize_t (*foo)(int, const struct msghdr *, int) = sendmsg;
                                                  ^~~~~~~
                                                  nsendmsg
/usr/include/sys/socket.h:646:9: note: 'nsendmsg' declared here
ssize_t sendmsg(int, const struct msghdr *, int);
        ^
/usr/include/sys/socket.h:174:25: note: expanded from macro 'sendmsg'
#define sendmsg         nsendmsg
                        ^
1 error generated.