Implementation status: partially implemented


#include <stdio.h>

int fputc(int c, FILE *stream);


Writes a character (an unsigned char) specified by the argument c to the specified stream and advances the position indicator for the stream.


c - a character,
stream - an output file.

The last data modification and last file status change timestamps of the file are marked for update between the successful execution of fputc() and the next successful completion of a call to fflush() or fclose() on the same stream or a call to exit() or abort().

Return value

On success the character written to the stream is returned. Otherwise EOF, the error indicator for the stream is set, and errno is set to indicate the error.


[EAGAIN] The O_NONBLOCK flag is set for the file descriptor underlying stream and the thread would be delayed in the write operation.
[EBADF] The file descriptor underlying stream is not a valid file descriptor open for writing.
[EFBIG] An attempt was made to write to a file that exceeds the maximum file size.
[EFBIG] An attempt was made to write to a file that exceeds the file size limit of the process.
[EFBIG] The file is a regular file and an attempt was made to write at or beyond the offset maximum.
[EINTR] The write operation was terminated due to the receipt of a signal, and no data was transferred.
[EIO] A physical I/O error has occurred, or the process is a member of a background process group attempting to write to its controlling terminal, TOSTOP is set, the calling thread is not blocking SIGTTOU, the process is not ignoring SIGTTOU, and the process group of the process is orphaned.
[ENOSPC] There was no free space remaining on the device containing the file.
[EPIPE] An attempt is made to write to a pipe or FIFO that is not open for reading by any process. A SIGPIPE signal is also sent to the thread.
[ENOMEM] Insufficient storage space is available.
[ENXIO] A request was made of a nonexistent device, or the request was outside the capabilities of the device.

Implementation tasks

  • Implement error handling for the function