fread man page on Tru64

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fread(3)							      fread(3)

NAME
       fread,  fread_unlocked,	fwrite, fwrite_unlocked - Perform input/output
       operations

SYNOPSIS
       #include <stdio.h>

       size_t fread(
	       void *pointer,
	       size_t *size,
	       size_t *num_items,
	       FILE *stream ); size_t fread_unlocked(
	       void *pointer,
	       size_t *size,
	       size_t *num_items,
	       FILE *stream ); size_t fwrite(
	       const void *pointer,
	       size_t *size,
	       size_t *num_items,
	       FILE *stream ); size_t fwrite_unlocked(
	       const void *pointer,
	       size_t *size,
	       size_t *num_items,
	       FILE *stream );

LIBRARY
       Standard C Library (libc)

STANDARDS
       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       fread(), fwrite():  XPG4, XPG4-UNIX

       Refer  to  the  standards(5)  reference page for more information about
       industry standards and associated tags.

PARAMETERS
       Points to an array.  Specifies the size of the  variable	 type  of  the
       array  pointed  to  by  the pointer parameter.  Specifies the number of
       items of data.  Specifies the input or output stream.

DESCRIPTION
       The fread() function copies num_items of data of length size  from  the
       input  stream into an array beginning at the location pointed to by the
       pointer

       r parameter.

       The fread() function stops copying bytes if  an	End-of-File  or	 error
       condition  is encountered while reading from the input specified by the
       stream parameter, or when the number of data  items  specified  by  the
       num_items  parameter  have  been	 copied.  The function leaves the file
       pointer of the stream parameter, if defined, pointing to the byte  fol‐
       lowing  the  last byte read, if there is one. The fread() function does
       not change the contents of the stream parameter.

       The fwrite() function appends num_items of data of length size from the
       array pointed to by the pointer parameter to the output stream.

       The  fwrite()  function	stops  writing	bytes if an error condition is
       encountered on the stream, or when the number of items of  data	speci‐
       fied  by the num_items parameter have been written.  The fwrite() func‐
       tion does not change the contents  of  the  array  pointed  to  by  the
       pointer parameter.

       The  fread_unlocked()  and fwrite_unlocked() functions are functionally
       identical  to  the  fread()  and	 fwrite()   functions,	 except	  that
       fread_unlocked() and fwrite_unlocked() may be safely used only within a
       scope that is protected by the flockfile() and funlockfile()  functions
       used as a pair. The caller must ensure that the stream is locked before
       using these functions.

NOTES
       If the stream parameter is invalid, the result of calling the  fread(),
       fwrite(),  fread_unlocked(),  and  fwrite_unlocked() functions is unde‐
       fined.

RETURN VALUES
       Upon successful completion, the	fread(),  fwrite(),  fread_unlocked(),
       and  fwrite_unlocked()  functions  return  the number of items actually
       transferred. If the num_items parameter is negative  or	0  (zero),  no
       characters  are	transferred, and a value of 0 (zero) is returned. If a
       read or write error occurs, the error indicator for the stream is  set,
       and errno is set to indicate the error.

ERRORS
       Refer  to  the  fgetc(3)	 reference  page  for  error codes returned by
       fread() and fread_unlocked().

       Refer to the fputc(3)  reference	 page  for  error  codes  returned  by
       fwrite() and fwrite_unlocked().

SEE ALSO
       Functions:  read(2),  write(2),	fopen(3), getc(3), gets(3), printf(3),
       putc(3), puts(3), scanf(3)

       Standards: standards(5)

								      fread(3)
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