getcallerpc.3 (644B)
1 .TH GETCALLERPC 3 2 .SH NAME 3 getcallerpc \- fetch return PC of current function 4 .SH SYNOPSIS 5 .br 6 .B #include <u.h> 7 .br 8 .B #include <libc.h> 9 .PP 10 .B ulong getcallerpc(void *firstarg) 11 .SH DESCRIPTION 12 .I Getcallerpc 13 is a portable way to discover the PC to which the current function will return. 14 .I Firstarg 15 should be a pointer to the first argument to the function in question. 16 .SH EXAMPLE 17 .IP 18 .EX 19 void 20 printpc(ulong arg) 21 { 22 print("Called from %.8lux\en", getcallerpc(&arg)); 23 } 24 25 void 26 main(int argc, char *argv[]) 27 { 28 printpc(0); 29 printpc(0); 30 printpc(0); 31 } 32 .EE 33 .SH SOURCE 34 .B \*9/src/lib9/ 35 .SH BUGS 36 The 37 .I firstarg 38 parameter should not be necessary.