ferror
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| + | ======Synopsis:====== | ||
| + | $[[ferror]](<<file descriptor>>) | ||
| + | |||
| + | ======Technical:====== | ||
| + | This function returns non-zero if an error has occurred on the | ||
| + | //file descriptor// since the last [[read]], because the [[read]] | ||
| + | and [[readb]] functions clear the //file descriptor//s error code. | ||
| + | |||
| + | When the [[read]] or [[readb]] function return the empty string, that | ||
| + | is caused either by an error, an eof, or a blank line. This function | ||
| + | will tell you if it was an error. The [[eof]] function will tell you | ||
| + | if it was an end of file. | ||
| + | |||
| + | The //file descriptor// must have been a value previously returned by | ||
| + | the [[open]] function. | ||
| + | |||
| + | ======Returns:====== | ||
| + | |-1 |Error: //file descriptor// was not previously returned by [[open]]| | ||
| + | | 0 |no error has occurred since the last [[read]]| | ||
| + | | 1 |an error has occurred since the last [[read]]| | ||
ferror.txt ยท Last modified: 2017/07/06 03:16 (external edit)