4.3BSD-Tahoe/usr/man/cat3f/traper.0

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TRAPER(3F)	    UNIX Programmer's Manual	       TRAPER(3F)



NNAAMMEE
     traper - trap arithmetic errors

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     iinntteeggeerr ffuunnccttiioonn ttrraappeerr ((mmaasskk))

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     Integer overflow and floating point underflow are not nor-
     mally trapped during execution. This routine enables these
     traps by setting status bits in the process status word.
     These bits are reset on entry to a subprogram, and the pre-
     vious state is restored on return.  Therefore, this routine
     must be called _i_n_s_i_d_e each subprogram in which these condi-
     tions should be trapped.  If the condition occurs and trap-
     ping is enabled, signal SIGFPE is sent to the process. (See
     _s_i_g_n_a_l(3C))

     The argument has the following meaning:

	     value   meaning
	       0     do not trap either condition
	       1     trap integer overflow only
	       2     trap floating underflow only
	       3     trap both the above

     The previous value of these bits is returned.

FFIILLEESS
     /usr/lib/libF77.a

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     signal(3C), signal(3F)




















Printed 7/9/88		  May 15, 1985				1