write.3p
#include <unistd.h> ssize_t pwrite(int fildes, const void *buf, size_t nbyte, off_t offset); ssize_t write(int fildes, const void *buf, size_t nbyte);
ssize_t pwrite(int fildes, const void *buf, size_t nbyte, off_t offset); ssize_t write(int fildes, const void *buf, size_t nbyte);