WRITE (man3p)
pwrite, write — write on a file
pwrite, write — write on a file
isnormal — test for a normal value
atexit — register a function to run at process termination
wctrans, wctrans_l — define character mapping
putc_unlocked — stdio with explicit client locking
getutxent, getutxid, getutxline — get user accounting database entries
dirfd — extract the file descriptor used by a DIR stream
pthread_rwlock_wrlock — lock a read-write lock object for writing
memchr — find byte in memory
unlink, unlinkat — remove a directory entry