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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 1999-2020 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include "xstring.h"
SYS_FUNC(close)
{
printfd(tcp, tcp->u_arg[0]);
return RVAL_DECODED;
}
static int
decode_select(struct tcb *const tcp, const kernel_ulong_t *const args,
const print_obj_by_addr_fn print_tv_ts,
const sprint_obj_by_addr_fn sprint_tv_ts)
{
int i, j;
int nfds, fdsize;
fd_set *fds = NULL;
const char *sep;
kernel_ulong_t addr;
/* Kernel truncates args[0] to int, we do the same. */
nfds = (int) args[0];
/* Kernel rejects negative nfds, so we don't parse it either. */
if (nfds < 0)
nfds = 0;
/* Beware of select(2^31-1, NULL, NULL, NULL) and similar... */
if (nfds > 1024*1024)
nfds = 1024*1024;
/*
* We had bugs a-la "while (j < args[0])" and "umoven(args[0])" below.
* Instead of args[0], use nfds for fd count, fdsize for array lengths.
*/
fdsize = (((nfds + 7) / 8) + current_wordsize-1) & -current_wordsize;
if (entering(tcp)) {
tprintf("%d", (int) args[0]);
if (verbose(tcp) && fdsize > 0)
fds = malloc(fdsize);
for (i = 0; i < 3; i++) {
addr = args[i+1];
tprints(", ");
if (!fds) {
printaddr(addr);
continue;
}
if (umoven_or_printaddr(tcp, addr, fdsize, fds))
continue;
tprints("[");
for (j = 0, sep = "";; j++) {
j = next_set_bit(fds, j, nfds);
if (j < 0)
break;
tprints(sep);
printfd(tcp, j);
sep = " ";
}
tprints("]");
}
free(fds);
tprints(", ");
print_tv_ts(tcp, args[4]);
} else {
static char outstr[1024];
char *outptr;
#define end_outstr (outstr + sizeof(outstr))
int ready_fds;
if (syserror(tcp))
return 0;
ready_fds = tcp->u_rval;
if (ready_fds == 0) {
tcp->auxstr = "Timeout";
return RVAL_STR;
}
fds = malloc(fdsize);
outptr = outstr;
sep = "";
for (i = 0; i < 3 && ready_fds > 0; i++) {
int first = 1;
addr = args[i+1];
if (!addr || !fds || umoven(tcp, addr, fdsize, fds) < 0)
continue;
for (j = 0;; j++) {
j = next_set_bit(fds, j, nfds);
if (j < 0)
break;
/* +2 chars needed at the end: ']',NUL */
if (outptr < end_outstr - (sizeof(", except [") + sizeof(int)*3 + 2)) {
if (first) {
outptr = xappendstr(outstr,
outptr,
"%s%s [%u",
sep,
i == 0 ? "in" : i == 1 ? "out" : "except",
j
);
first = 0;
sep = ", ";
} else {
outptr = xappendstr(outstr,
outptr,
" %u", j);
}
}
if (--ready_fds == 0)
break;
}
if (outptr != outstr)
*outptr++ = ']';
}
free(fds);
/* This contains no useful information on SunOS. */
if (args[4]) {
const char *str = sprint_tv_ts(tcp, args[4]);
if (outptr + sizeof("left ") + strlen(sep) + strlen(str) < end_outstr) {
outptr = xappendstr(outstr, outptr,
"%sleft %s", sep, str);
}
}
*outptr = '\0';
tcp->auxstr = outstr;
return RVAL_STR;
#undef end_outstr
}
return 0;
}
#if HAVE_ARCH_OLD_SELECT
SYS_FUNC(oldselect)
{
kernel_ulong_t *args =
fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 5);
if (args) {
return decode_select(tcp, args, print_timeval, sprint_timeval);
} else {
if (entering(tcp))
printaddr(tcp->u_arg[0]);
return RVAL_DECODED;
}
}
#endif /* HAVE_ARCH_OLD_SELECT */
#ifdef ALPHA
SYS_FUNC(osf_select)
{
return decode_select(tcp, tcp->u_arg, print_timeval32, sprint_timeval32);
}
#endif
SYS_FUNC(select)
{
return decode_select(tcp, tcp->u_arg, print_timeval, sprint_timeval);
}
static int
do_pselect6(struct tcb *const tcp, const print_obj_by_addr_fn print_ts,
const sprint_obj_by_addr_fn sprint_ts)
{
int rc = decode_select(tcp, tcp->u_arg, print_ts, sprint_ts);
if (entering(tcp)) {
tprints(", ");
print_kernel_sigset(tcp, tcp->u_arg[5]);
}
return rc;
}
#if HAVE_ARCH_TIME32_SYSCALLS
SYS_FUNC(pselect6_time32)
{
return do_pselect6(tcp, print_timespec32, sprint_timespec32);
}
#endif
SYS_FUNC(pselect6_time64)
{
return do_pselect6(tcp, print_timespec64, sprint_timespec64);
}
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