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fread(3c)
fread(3C) Standard C Library Functions fread(3C)
NAME
fread - binary input
SYNOPSIS
#include <stdio.h>
size_t fread(void *ptr, size_t size, size_t nitems, FILE *stream);
DESCRIPTION
The fread() function reads into the array pointed to by ptr up to
nitems elements whose size is specified by size in bytes, from the
stream pointed to by stream. For each object, size calls are made to
the fgetc(3C) function and the results stored, in the order read, in an
array of unsigned char exactly overlaying the object. The file-position
indicator for the stream (if defined) is advanced by the number of
bytes successfully read. If an error occurs, the resulting value of the
file-position indicator for the stream is unspecified. If a partial el‐
ement is read, its value is unspecified.
The fread() function may mark the st_atime field of the file associated
with stream for update. The st_atime field will be marked for update by
the first successful execution of fgetc(3C), fgets(3C), fgetwc(3C),
fgetws(3C), fread(), fscanf(3C), getc(3C), getchar(3C), getdelim(3C),
getline(3C), gets(3C), or scanf(3C) using stream that returns data not
supplied by a prior call to ungetc(3C) or ungetwc(3C).
RETURN VALUES
Upon successful completion, fread() returns the number of elements suc‐
cessfully read, which is less than nitems only if a read error or end-
of-file is encountered. If size or nitems is 0, fread() returns 0 and
the contents of the array and the state of the stream remain unchanged.
Otherwise, if a read error occurs, the error indicator for the stream
is set and errno is set to indicate the error.
ERRORS
Refer to fgetc(3C).
EXAMPLES
Example 1 Reading from a Stream
The following example reads a single element from the fp stream into
the array pointed to by buf.
#include <stdio.h>
...
size_t bytes_read;
char buf[100];
FILE *fp;
...
bytes_read = fread(buf, sizeof(buf), 1, fp);
...
USAGE
The ferror() or feof() functions must be used to distinguish between an
error condition and end-of-file condition. See ferror(3C).
Because of possible differences in element length and byte ordering,
files written using fwrite(3C) are application-dependent, and possibly
cannot be read using fread() by a different application or by the same
application on a different processor.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
dardSee standards(7).
SEE ALSO
read(2), fclose(3C), ferror(3C), fopen(3C), getc(3C), getdelim(3C),
getline(3C), gets(3C), printf(3C), putc(3C), puts(3C), attributes(7),
standards(7)
Oracle Solaris 11.4 24 Jul 2002 fread(3C)