1FREAD(3)                   Linux Programmer's Manual                  FREAD(3)
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NAME

6       fread, fwrite - binary stream input/output
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SYNOPSIS

9       #include <stdio.h>
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11       size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
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13       size_t   fwrite(const  void  *ptr,  size_t  size,  size_t  nmemb,  FILE
14       *stream);
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DESCRIPTION

17       The function fread() reads nmemb elements  of  data,  each  size  bytes
18       long,  from  the stream pointed to by stream, storing them at the loca‐
19       tion given by ptr.
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21       The function fwrite() writes nmemb elements of data,  each  size  bytes
22       long, to the stream pointed to by stream, obtaining them from the loca‐
23       tion given by ptr.
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25       For non-locking counterparts, see unlocked_stdio(3).
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RETURN VALUE

28       fread() and fwrite() return the number of items  successfully  read  or
29       written  (i.e.,  not the number of characters).  If an error occurs, or
30       the end-of-file is reached, the return value is a short item count  (or
31       zero).
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33       fread() does not distinguish between end-of-file and error, and callers
34       must use feof(3) and ferror(3) to determine which occurred.
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CONFORMING TO

37       C89, POSIX.1-2001.
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SEE ALSO

40       read(2), write(2), feof(3), ferror(3), unlocked_stdio(3)
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44BSD MANPAGE                       1996-05-17                          FREAD(3)
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