29 lines
1 KiB
Groff
Executable file
29 lines
1 KiB
Groff
Executable file
.TH FEHOLDEXCEPT 3 "December 22, 2009"
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.UC 4
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.SH NAME
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feholdexcept \- disable floating point exceptions
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.SH SYNOPSIS
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.nf
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.ft B
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#include <fenv.h>
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int feholdexcept(fenv_t *\fIenvp\fP);
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.fi
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.SH DESCRIPTION
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The feholdexcept function disables floating point exceptions. The floating
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point environment prior to disabling exceptions is stored in the struct
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pointed to by \fIenvp\fP.
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.SH "RETURN VALUE"
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On x86, this function never fails and the return value is always 0. A portable
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program should, however, consider the possibility that this function may fail
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and will return -1 to indicate this.
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.SH "KNOWN ISSUES"
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POSIX requires the function to clear exception flags. However, as none of the
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other functions dealing with FPU flags and FPU state have been implemented this
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has no effect on MINIX. A full implementation may need to store more FPU state
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as there is no instruction to change the status word independent of the rest
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of the FPU state. Do not depend on the fields of fenv_t as they may change even
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on future versions of MINIX/x86.
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