projects / thirdparty / man-pages.git / blame
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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| 2 | .\" | |
| 93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
| 5 | .\" manual provided the copyright notice and this permission notice are | |
| 6 | .\" preserved on all copies. | |
| 7 | .\" | |
| 8 | .\" Permission is granted to copy and distribute modified versions of this | |
| 9 | .\" manual under the conditions for verbatim copying, provided that the | |
| 10 | .\" entire resulting derived work is distributed under the terms of a | |
| 11 | .\" permission notice identical to this one. | |
| c13182ef | 12 | .\" |
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13 | .\" Since the Linux kernel and libraries are constantly changing, this |
| 14 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
| 15 | .\" responsibility for errors or omissions, or for damages resulting from | |
| 16 | .\" the use of the information contained herein. The author(s) may not | |
| 17 | .\" have taken the same level of care in the production of this manual, | |
| 18 | .\" which is licensed free of charge, as they might when working | |
| 19 | .\" professionally. | |
| c13182ef | 20 | .\" |
| fea681da MK |
21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
| 22 | .\" the source, must acknowledge the copyright and authors of this work. | |
| 4b72fb64 | 23 | .\" %%%LICENSE_END |
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24 | .\" |
| 25 | .\" References consulted: | |
| 26 | .\" Linux libc source code | |
| 27 | .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) | |
| 28 | .\" 386BSD man pages | |
| 29 | .\" Modified Sat Jul 24 19:11:11 1993 by Rik Faith (faith@cs.unc.edu) | |
| 94426bbf MK |
30 | .\" Modified 2004-11-12 as per suggestion by Fabian Kreutz/AEB |
| 31 | .\" to note that this function is not available in glibc2. | |
| 32 | .\" | |
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33 | .TH INFNAN 3 1993-06-02 "GNU" "Linux Programmer's Manual" |
| 34 | .SH NAME | |
| 35 | infnan \- deal with infinite or not-a-number (NaN) result | |
| 36 | .SH SYNOPSIS | |
| 37 | .nf | |
| 38 | .B #include <math.h> | |
| 39 | .sp | |
| 40 | .BI "double infnan(int " error ); | |
| 41 | .fi | |
| 42 | .sp | |
| 20c58d70 | 43 | Link with \fI\-lm\fP. |
| fea681da | 44 | .SH DESCRIPTION |
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45 | The |
| 46 | .BR infnan () | |
| 47 | function returns a suitable value for infinity and | |
| c13182ef | 48 | "not-a-number" (NaN) results. |
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49 | The value of |
| 50 | .I error | |
| 51 | can be | |
| a9b4ebbc | 52 | .B ERANGE |
| be7fff26 | 53 | to represent infinity or anything else to represent NaN. |
| 35cfd378 | 54 | .I errno |
| fea681da | 55 | is also set. |
| 47297adb | 56 | .SH RETURN VALUE |
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57 | If |
| 58 | .I error | |
| 59 | is | |
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60 | .B ERANGE |
| 61 | (Infinity), | |
| 62 | .B HUGE_VAL | |
| 63 | is returned. | |
| fea681da | 64 | .PP |
| 35cfd378 MK |
65 | If |
| 66 | .I error | |
| 51700fd7 | 67 | is |
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68 | .RB \- ERANGE |
| 69 | (\-Infinity), | |
| 70 | .RB \- HUGE_VAL | |
| 71 | is returned. | |
| fea681da | 72 | .PP |
| 35cfd378 MK |
73 | If |
| 74 | .I error | |
| 75 | is anything else, NAN is returned. | |
| fea681da MK |
76 | .SH ERRORS |
| 77 | .TP | |
| 78 | .B EDOM | |
| 35cfd378 MK |
79 | The value of |
| 80 | .I error | |
| 81 | is "not-a-number" (NaN). | |
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82 | .TP |
| 83 | .B ERANGE | |
| 35cfd378 MK |
84 | The value of |
| 85 | .I error | |
| 86 | is positive infinity or negative infinity. | |
| 47297adb | 87 | .SH CONFORMING TO |
| 44a2c328 | 88 | 4.3BSD. |
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89 | .SH NOTES |
| 90 | This obsolete function was provided in | |
| aeb76cd4 | 91 | libc4 and libc5, but is not available in glibc2. |