[Bug libc/712] New: fread() should not call read() again once the latter returns zero

["bww at acm dot org" <sourceware-bugzilla at sources dot redhat dot com>]

/*
 * fread() should not call read() again once the latter
 * returns zero, otherwise the following "cat" program
 * requires two EOF indications to terminate (which has
 * the most obvious effect when reading from a terminal).
 *
 * For example under Fedora Core release 3 ...
 *    % gcc -static c.c -o c
 *    % echo hello | strace -e read ./c 
 *    read(0, "hello\n", 4096)                = 6
 *    read(0, "", 4096)                       = 0
 *    hello
 *    read(0, "", 4096)                       = 0
 *
 * whereas under Solaris 5.8 ...
 *    % gcc -static c.c -o c
 *    % echo hello | truss -t read ./c
 *    read(0, " h e l l o\n", 5120)                   = 6
 *    read(0, 0x000549DC, 5120)                       = 0
 *    hello
 */

#include <stdio.h>

int
main()
{
    char buf[128];
    size_t cc;

    while ((cc = fread(buf, 1, sizeof buf, stdin)) != 0)
        fwrite(buf, 1, cc, stdout);

    return 0;
}

-- 
           Summary: fread() should not call read() again once the latter
                    returns zero
           Product: glibc
           Version: 2.3.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: bww at acm dot org
                CC: glibc-bugs at sources dot redhat dot com


http://sources.redhat.com/bugzilla/show_bug.cgi?id=712

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