xtryexecfunc 750 src/cmd/dist/plan9.c xtryexecfunc(void (*f)(void)) xtryexecfunc 788 src/cmd/dist/unix.c xtryexecfunc(void (*f)(void)) xtryexecfunc 959 src/cmd/dist/windows.c xtryexecfunc(void (*f)(void))