fgetwc - get a wide-character code from a stream
The fgetwc() function obtains the next character (if
present) from the input stream pointed to by stream, con-
verts that to the corresponding wide-character code and
advances the associated file position indicator for the
stream (if defined).
If an error occurs, the resulting value of the file position
indicator for the stream is indeterminate.
The fgetwc() function may mark the st_atime field of the
file associated with stream for update. The st_atime field
will be marked for update by the first successful execution
of fgetwc(), fgetc(3C), fgets(3C), fgetws(3C), fread(3C),
fscanf(3C), getc(3C), getchar(3C), gets(3C), or scanf(3C)
using stream that returns data not supplied by a prior call
to ungetc(3C) or ungetwc(3C).
Upon successful completion the fgetwc() function returns the
wide-character code of the character read from the input
stream pointed to by stream converted to a type wint_t.
If the stream is at end-of-file, the end-of-file indicator
for the stream is set and fgetwc() returns WEOF.
If a read error occurs, the error indicator for the stream
is set, fgetwc() returns WEOF and sets errno to indicate the
The fgetwc() function will fail if data needs to be read
The O_NONBLOCK flag is set for the file descriptor
underlying stream and the process would be delayed in
the fgetwc() operation.
EBADF The file descriptor underlying stream is not a valid
file descriptor open for reading.
EINTR The read 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
in a background process group attempting to read from
its controlling terminal and either the process is
ignoring or blocking the SIGTTIN signal or the process
group is orphaned.
The file is a regular file and an attempt was made to
read at or beyond the offset maximum associated with
the corresponding stream.
The fgetwc() function may fail if:
Insufficient storage space is available.
ENXIO A request was made of a non-existent device, or the
request was outside the capabilities of the device.
The data obtained from the input stream does not form
a valid character.
The ferror(3C) or feof(3C) functions must be used to distin-
guish between an error condition and an end-of-file condi-
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | MT-Safe with exceptions |
| CSI | Enabled |
feof(3C), ferror(3C), fgetc(3C), fgets(3C), fgetws(3C),
fopen(3C), fread(3C), fscanf(3C), getc(3C), getchar(3C),
gets(3C), scanf(3C), setlocale(3C), ungetc(3C), ungetwc(3C),
Man(1) output converted with