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Standard C Libraries
raise
Description:
Include:
Prototype:
Argument:
Return Value:
Remarks:
Reports a synchronous signal.
<signal.h>
int raise(int sig );
sig signal name
Returns a 0 if successful; otherwise, returns a non-zero value.
raise sends the signal identified by sig to the executing program.
Example:
#include <signal.h>
/*
for raise, signal,
*/
/*
#include <stdlib.h> /*
#include <stdio.h> /*
#include <p30f6014.h> /*
SIGILL, SIG_DFL
for div, div_t
for printf
for INTCON1bits */
*/
*/
*/
void __ attribute __ (( __ interrupt __ ))
_MathError(void)
{
raise(SIGILL);
INTCON1bits.MATHERR = 0;
}
void illegalinsn(int idsig)
{
printf("Illegal instruction executed\n");
exit(1);
}
int main(void)
{
int x, y;
div_t z;
signal(SIGILL, illegalinsn);
x = 7;
y = 0;
z = div(x, y);
printf("Program never reaches here");
}
Output:
Illegal instruction executed
Explanation:
This example requires the linker script p30f6014.gld . There are
three parts to this example.
First, an interrupt handler is written for the interrupt vector
_MathError to handle a math error by sending an illegal instruction
signal (SIGILL) to the executing program. The last statement in
the interrupt handler clears the exception flag.
Second, the function illegalinsn will print an error message and
call exit .
Third, in main , signal (SIGILL, illegalinsn) sets the handler
for SIGILL to the function illegalinsn .
When a math error occurs, due to a divide by zero, the _MathError
interrupt vector is called, which in turn will raise a signal that will call the
handler function for SIGILL , which is the function illegalinsn .
Thus error messages are printed and the program is terminated.
? 2008 Microchip Technology Inc.
DS51456E-page 37
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