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466
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1 <refentry id="feof">
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2 <refnamediv>
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570
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3 <refname>Feof</refname>
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4 <refname>Ferror</refname>
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5 <refname>Clearerr</refname>
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6 <refname>Fileno</refname>
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7 <refpurpose>return status information of files</refpurpose>
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466
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8 </refnamediv>
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9
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10 <refsynopsisdiv>
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11 <funcsynopsis>
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468
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12 <funcsynopsisinfo>
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13 #include <stdio.h>
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14 </funcsynopsisinfo>
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466
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15 <funcprototype>
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16 <funcdef><function>feof</function></funcdef>
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570
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17 <paramdef>FILE *<parameter>fp</parameter></paramdef>
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18 </funcprototype>
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19
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20 <funcprototype>
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21 <funcdef><function>ferror</function></funcdef>
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22 <paramdef>FILE *<parameter>fp</parameter></paramdef>
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23 </funcprototype>
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24
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25 <funcprototype>
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26 <funcdef><function>clearerr</function></funcdef>
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27 <paramdef>FILE *<parameter>fp</parameter></paramdef>
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28 </funcprototype>
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29
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30 <funcprototype>
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31 <funcdef><function>fileno</function></funcdef>
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32 <paramdef>FILE *<parameter>fp</parameter></paramdef>
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466
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33 </funcprototype>
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34 </funcsynopsis>
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35
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36 </refsynopsisdiv>
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37
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38 <refsect1><title>Description</title>
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39 <para>
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594
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40 Feof returns non-zero if the file associated with "fp" has
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41 reached its end. Zero is returned on error.
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42 </para>
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43 <para>
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44 Ferror returns non-zero if an error condition occurs on access
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45 to the file "fp"; zero is returned otherwise. The error
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46 condition persists, preventing further access to the file by
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47 other Standard Library functions, until the file is closed,
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48 or it is cleared by clearerr.
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49 </para>
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50 <para>
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51 Clearerr resets the error condition on the file "fp". This
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52 does NOT "fix" the file or prevent the error from occurring
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53 again; it merely allows Standard Library functions at least to
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54 try.
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55 </para>
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56 </refsect1>
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57
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58 <refsect1><title>Caveats</title>
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59 <para>
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60 These functions are actually macros that are defined in
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61 "<stdio.h>" so their names cannot be redeclared.
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466
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62 </para>
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63 </refsect1>
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542
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64
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65 <refsect1><title>See Also</title>
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66 <para>
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67 System call
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68 <link linkend="open">open()</link>,
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69 <link linkend="fopen">fopen()</link>.
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70 </para>
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71 </refsect1>
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72
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466
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73 </refentry>
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