NAME

getcallerpc − fetch return PC of current function

SYNOPSIS

­#include <u.h>
­#include <libc.h>

­ulong getcallerpc(void ∗firstarg)

DESCRIPTION

­Getcallerpc is a portable way to discover the PC to which the current function will return.  ­Firstarg should be a pointer to the first argument to the function in question. 

EXAMPLE

void
printpc(ulong arg)
{
print("Called from %.8lux\n", getcallerpc(&arg));
}
 void
main(int argc, char ∗argv[])
{
printpc(0);
printpc(0);
printpc(0);
}

SOURCE

­/sys/src/libc/$objtype/getcallerpc.[cs]

BUGS

The ­firstarg parameter should not be necessary. 

Plan 9  —  July 24, 2000