#include <u.h> #include <libc.h> #define NEXIT 33 static Lock onexlock; static struct { void (*f)(void); int pid; }onex[NEXIT]; int atexit(void (*f)(void)) { int i; lock(&onexlock); for(i=0; i<NEXIT; i++) if(onex[i].f == 0) { onex[i].pid = getpid(); onex[i].f = f; unlock(&onexlock); return 1; } unlock(&onexlock); return 0; } void atexitdont(void (*f)(void)) { int i, pid; pid = getpid(); for(i=0; i<NEXIT; i++) if(onex[i].f == f && onex[i].pid == pid) onex[i].f = 0; } void exits(char *s) { int i, pid; void (*f)(void); pid = getpid(); for(i = NEXIT-1; i >= 0; i--) if((f = onex[i].f) && pid == onex[i].pid) { onex[i].f = 0; (*f)(); } if(s == 0 || *s == 0) exit(0); exit(exitcode(s)); }