granicus.if.org Git - strace/blob - epoll.c

   1 #include "defs.h"
   2 #include <fcntl.h>
   3 #ifdef HAVE_SYS_EPOLL_H
   4 # include <sys/epoll.h>
   5 #endif
   6
   7 SYS_FUNC(epoll_create)
   8 {
   9         tprintf("%d", (int) tcp->u_arg[0]);
  10
  11         return RVAL_DECODED | RVAL_FD;
  12 }
  13
  14 #include "xlat/epollflags.h"
  15
  16 SYS_FUNC(epoll_create1)
  17 {
  18         printflags(epollflags, tcp->u_arg[0], "EPOLL_???");
  19
  20         return RVAL_DECODED | RVAL_FD;
  21 }
  22
  23 #ifdef HAVE_SYS_EPOLL_H
  24 # include "xlat/epollevents.h"
  25
  26 static void
  27 print_epoll_event(struct epoll_event *ev)
  28 {
  29         tprints("{");
  30         printflags(epollevents, ev->events, "EPOLL???");
  31         /* We cannot know what format the program uses, so print u32 and u64
  32            which will cover every value.  */
  33         tprintf(", {u32=%" PRIu32 ", u64=%" PRIu64 "}}",
  34                 ev->data.u32, ev->data.u64);
  35 }
  36 #endif
  37
  38 #include "xlat/epollctls.h"
  39
  40 SYS_FUNC(epoll_ctl)
  41 {
  42         struct epoll_event ev;
  43
  44         printfd(tcp, tcp->u_arg[0]);
  45         tprints(", ");
  46         printxval(epollctls, tcp->u_arg[1], "EPOLL_CTL_???");
  47         tprints(", ");
  48         printfd(tcp, tcp->u_arg[2]);
  49         tprints(", ");
  50 #ifdef HAVE_SYS_EPOLL_H
  51         if (EPOLL_CTL_DEL == tcp->u_arg[1])
  52                 printaddr(tcp->u_arg[3]);
  53         else if (!umove_or_printaddr(tcp, tcp->u_arg[3], &ev))
  54                 print_epoll_event(&ev);
  55 #else
  56         printaddr(tcp->u_arg[3]);
  57 #endif
  58
  59         return RVAL_DECODED;
  60 }
  61
  62 static void
  63 print_epoll_event_array(struct tcb *tcp, const long addr, const long len)
  64 {
  65 #ifdef HAVE_SYS_EPOLL_H
  66         struct epoll_event ev, *start, *cur, *end;
  67
  68         if (!len) {
  69                 tprints("[]");
  70                 return;
  71         }
  72
  73         if (umove_or_printaddr(tcp, addr, &ev))
  74                 return;
  75
  76         tprints("[");
  77         print_epoll_event(&ev);
  78
  79         start = (struct epoll_event *) addr;
  80         end = start + len;
  81         for (cur = start + 1; cur < end; ++cur) {
  82                 tprints(", ");
  83                 if (umove_or_printaddr(tcp, (long) cur, &ev))
  84                         break;
  85                 print_epoll_event(&ev);
  86         }
  87         tprints("]");
  88 #else
  89         printaddr(addr);
  90 #endif
  91 }
  92
  93 static void
  94 epoll_wait_common(struct tcb *tcp)
  95 {
  96         if (entering(tcp)) {
  97                 printfd(tcp, tcp->u_arg[0]);
  98                 tprints(", ");
  99         } else {
 100                 print_epoll_event_array(tcp, tcp->u_arg[1], tcp->u_rval);
 101                 tprintf(", %d, %d", (int) tcp->u_arg[2], (int) tcp->u_arg[3]);
 102         }
 103 }
 104
 105 SYS_FUNC(epoll_wait)
 106 {
 107         epoll_wait_common(tcp);
 108         return 0;
 109 }
 110
 111 SYS_FUNC(epoll_pwait)
 112 {
 113         epoll_wait_common(tcp);
 114         if (exiting(tcp)) {
 115                 tprints(", ");
 116                 /* NB: kernel requires arg[5] == NSIG / 8 */
 117                 print_sigset_addr_len(tcp, tcp->u_arg[4], tcp->u_arg[5]);
 118                 tprintf(", %lu", tcp->u_arg[5]);
 119         }
 120         return 0;
 121 }