getc_unlocked()

Get the next character from a file

Synopsis:

#include <stdio.h>

int getc_unlocked( FILE *fp );

Arguments:

fp: The stream you want to get the character from.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The getc_unlocked() function is a thread-unsafe version of getc(). You can use it safely only when the invoking thread has locked fp using flockfile() (or ftrylockfile()) and funlockfile().

Returns:

If successful, getc_unlocked() returns the next character from fp, cast as (int)(unsigned char).
If the end-of-file indicator for the stream is set or the end of the file has been reached, getc_unlocked() sets the end-of-file indicator and returns EOF.
If an error occurred, getc_unlocked() sets the error indicator for the stream, sets errno, and returns EOF.

Note: Use feof() or ferror() to distinguish an end-of-file condition from an error.

Classification:

POSIX 1003.1

Safety:
Cancellation point	Yes
Interrupt handler	No
Signal handler	No
Thread	No