projects / unix-history / blame
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1 | .\" Copyright (c) 1990 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| 31c2cc46 | 3 | .\" |
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4 | .\" This code is derived from software contributed to Berkeley by |
| 5 | .\" Chris Torek. | |
| 31c2cc46 | 6 | .\" |
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7 | .\" %sccs.include.redist.man% |
| 8 | .\" | |
| c07f2720 | 9 | .\" @(#)ferror.3 6.6 (Berkeley) %G% |
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10 | .\" |
| 11 | .TH FERROR 3 "" | |
| 12 | .UC 7 | |
| 31c2cc46 | 13 | .SH NAME |
| 639aed4c | 14 | clearerr, feof, ferror, fileno \- stream status inquiries |
| 31c2cc46 | 15 | .SH SYNOPSIS |
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16 | .nf |
| 17 | .ft B | |
| 18 | #include <stdio.h> | |
| 19 | ||
| 20 | void | |
| 21 | clearerr(FILE *stream); | |
| 22 | ||
| 23 | int | |
| 24 | feof(FILE *stream); | |
| 25 | ||
| 26 | int | |
| 27 | ferror(FILE *stream); | |
| 28 | ||
| 29 | int | |
| 30 | fileno(FILE *stream); | |
| 31 | .ft R | |
| 32 | .fi | |
| 31c2cc46 | 33 | .SH DESCRIPTION |
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34 | .I Clearerr |
| 35 | clears the end-of-file and error indicators for the stream pointed | |
| 36 | to by | |
| 37 | .IR stream . | |
| 38 | .PP | |
| 31c2cc46 | 39 | .I Feof |
| 639aed4c | 40 | tests the end-of-file indicator for the stream pointed to by |
| 68b48c9d | 41 | .IR stream , |
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42 | returning non-zero if it is set. |
| 43 | The end-of-file indicator can only be cleared by | |
| 44 | .IR clearerr . | |
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45 | .PP |
| 46 | .I Ferror | |
| 639aed4c | 47 | tests the error indicator for the stream pointed to by |
| 68b48c9d | 48 | .IR stream , |
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49 | returning non-zero if it is set. |
| 50 | The error indicator can only be cleared by | |
| 51 | .IR clearerr . | |
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52 | .PP |
| 53 | .I Fileno | |
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54 | returns the integer file descriptor associated with the |
| 55 | .I stream | |
| 56 | (see | |
| 57 | .IR open (2)). | |
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58 | .SH ERRORS |
| 59 | These functions should not fail and do not set the external | |
| 60 | variable | |
| 61 | .IR errno . | |
| 31c2cc46 | 62 | .SH "SEE ALSO" |
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63 | open(2), stdio(3) |
| 64 | .SH STANDARDS | |
| 65 | .IR Clearerr , | |
| 66 | .IR feof , | |
| 67 | and | |
| 68 | .I ferror | |
| 69 | conform to ANSI X3.159-1989 (``ANSI C''). |