No errors are detected, 0 will be returned without causing any other effect. If count is zero and fd refers to a regular file, then write() may return a failure status if one of the errors below is detected. OnĮrror, -1 is returned, and errno is set appropriately.

On success, the number of bytes written is returned (zero indicates nothing was written). POSIX requires that a read(2) which can be proved to occur after a write() has returned returns the new data. The adjustment of the file offset and the write operation are performed as an atomic step.

If the file was open(2)ed with O_APPEND, the file offset isįirst set to the end of the file before writing. RLIMIT_FSIZE resource limit is encountered (see setrlimit(2)), or the call was interrupted by a signal handler after having written lessįor a seekable file (i.e., one to which lseek(2) may be applied, for example, a regular file) writing takes place at the current file offset,Īnd the file offset is incremented by the number of bytes actually written. The number of bytes written may be less than count if, for example, there is insufficient space on the underlying physical medium, or the Write() writes up to count bytes from the buffer pointed buf to the file

Write in c