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fperr(2) [bsd man page]

FPERR(2)							System Calls Manual							  FPERR(2)

NAME
fperr - get floating-point error registers (2BSD) SYNOPSIS
#include <pdp/fperr.h> struct fperr { short f_fec; caddr_t f_fea; }; fperr(fpe) struct fperr *fpe; DESCRIPTION
Fperr returns the contents of the floating-point processor's error registers as they were following the last floating exception generated by the calling process. The registers are stored in the structure pointed to by fpe. This call is required because the error registers in the PDP-11 floating-point processor are read-only. Thus, they may be changed by some other process between the time that the current process generates an exception and the time that it reads the registers. Therefore, the system saves their state at the time of an exception. The values returned are valid only after a floating-point exception. ERRORS
[EINVAL] The kernel has not been compiled for a processor with floating point. SEE ALSO
Ed Gould, Jim Reeds, Vance Vaughan, UNIX Problems with Floating Point Processors BUGS
Fperr is unique to the PDP-11 and 2BSD; its use is discouraged. 3rd Berkeley Distribution January 22, 1987 FPERR(2)

Check Out this Related Man Page

fegetexceptflag(3M)													       fegetexceptflag(3M)

NAME
fegetexceptflag() - get floating-point exception flags SYNOPSIS
HP Integrity Server Only PA-RISC Only DESCRIPTION
The function stores a representation of the states of the floating-point exception flags indicated by the argument excepts in the object pointed to by the argument flagp. The excepts argument can be constructed as a bitwise OR of the floating-point exception macros: and rep- resents all the floating-point exceptions. The object into which the floating-point exception flags are stored can be passed to to restore the system exception flags, but the representation of the floating-point exception flags stored in the object is otherwise unspecified. Use instead of to determine which floating-point exception flags are set. USAGE
To use this function, compile either with the default option or with the and options. Make sure your program includes For Integrity servers, specify on the compiler command line or place the call to this function under the effect of an affirmative pragma: If the pragma is placed outside of any top-level declarations in a file, the pragma will apply to all declarations in the compilation fol- lowing the pragma until another pragma is encountered or until the end of the file is reached. If the pragma is placed at the beginning of a block (compound statement), the pragma will apply until another pragma is encountered or until the end of the block is reached. For PA-RISC, you might need to use the compiler option in order to prevent optimizations that can undermine the specified behavior of this function. Link in the math library by specifying on the compiler or linker command line. For more information, see the at the following site: RETURN VALUE
Integrity Server Only This function always returns 0, indicating that a representation was successfully stored. PA-RISC Only None. ERRORS
No errors are defined. EXAMPLES
Store the overflow and invalid floating-point exception flags: SEE ALSO
feclearexcept(3M), fegettrapenable(3M), feraiseexcept(3M), fesetexceptflag(3M), fesettrapenable(3M), fetestexcept(3M), fenv(5). STANDARDS CONFORMANCE
: ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arithmetic") fegetexceptflag(3M)
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