|FREAD(3)||Library Functions Manual||FREAD(3)|
*ptr, size_t size,
void *ptr, size_t
size, size_t nmemb,
fread() reads nmemb objects, each size bytes long, from the stream pointed to by stream, storing them at the location given by ptr.
nmemb objects, each size bytes
long, to the stream pointed to by stream, obtaining
them from the location given by ptr.
fwrite() advance the file position indicator for the stream by the number of bytes read or written. They return the number of objects read or written. If size or nmemb is 0,
fwrite() return 0 with no change made to the stream. If the product of size and nmemb results in integer overflow, 0 is returned and errno is set to
EOVERFLOW. If an error occurs, or the end-of-file is reached, the return value is a short object count (or zero).
fread() does not distinguish
between end-of-file and error, and callers must use
ferror(3) to determine which occurred.
fwrite() returns a value less than
nmemb only if a write error has occurred.
fwrite() conform to ANSI X3.159-1989 (“ANSI C89”).
fwrite() first appeared in Version 7 AT&T UNIX.
|March 12, 2015||OpenBSD-current|