linux-user: add pselect6 syscall support
Some architectures (like Blackfin) only implement pselect6 (and skip
select/newselect). So add support for it.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 608924a..9f9693e 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -550,6 +550,15 @@
size_t, sigsetsize)
#endif
+#if defined(TARGET_NR_pselect6)
+#ifndef __NR_pselect6
+# define __NR_pselect6 -1
+#endif
+#define __NR_sys_pselect6 __NR_pselect6
+_syscall6(int, sys_pselect6, int, nfds, fd_set *, readfds, fd_set *, writefds,
+ fd_set *, exceptfds, struct timespec *, timeout, void *, sig);
+#endif
+
extern int personality(int);
extern int flock(int, int);
extern int setfsuid(int);
@@ -819,6 +828,20 @@
return 0;
}
+static inline abi_ulong copy_from_user_fdset_ptr(fd_set *fds, fd_set **fds_ptr,
+ abi_ulong target_fds_addr,
+ int n)
+{
+ if (target_fds_addr) {
+ if (copy_from_user_fdset(fds, target_fds_addr, n))
+ return -TARGET_EFAULT;
+ *fds_ptr = fds;
+ } else {
+ *fds_ptr = NULL;
+ }
+ return 0;
+}
+
static inline abi_long copy_to_user_fdset(abi_ulong target_fds_addr,
const fd_set *fds,
int n)
@@ -984,6 +1007,7 @@
}
#endif
+#if defined(TARGET_NR_select) || defined(TARGET_NR__newselect)
/* do_select() must return target values and target errnos. */
static abi_long do_select(int n,
abi_ulong rfd_addr, abi_ulong wfd_addr,
@@ -994,26 +1018,17 @@
struct timeval tv, *tv_ptr;
abi_long ret;
- if (rfd_addr) {
- if (copy_from_user_fdset(&rfds, rfd_addr, n))
- return -TARGET_EFAULT;
- rfds_ptr = &rfds;
- } else {
- rfds_ptr = NULL;
+ ret = copy_from_user_fdset_ptr(&rfds, &rfds_ptr, rfd_addr, n);
+ if (ret) {
+ return ret;
}
- if (wfd_addr) {
- if (copy_from_user_fdset(&wfds, wfd_addr, n))
- return -TARGET_EFAULT;
- wfds_ptr = &wfds;
- } else {
- wfds_ptr = NULL;
+ ret = copy_from_user_fdset_ptr(&wfds, &wfds_ptr, wfd_addr, n);
+ if (ret) {
+ return ret;
}
- if (efd_addr) {
- if (copy_from_user_fdset(&efds, efd_addr, n))
- return -TARGET_EFAULT;
- efds_ptr = &efds;
- } else {
- efds_ptr = NULL;
+ ret = copy_from_user_fdset_ptr(&efds, &efds_ptr, efd_addr, n);
+ if (ret) {
+ return ret;
}
if (target_tv_addr) {
@@ -1040,6 +1055,7 @@
return ret;
}
+#endif
static abi_long do_pipe2(int host_pipe[], int flags)
{
@@ -5601,7 +5617,102 @@
#endif
#ifdef TARGET_NR_pselect6
case TARGET_NR_pselect6:
- goto unimplemented_nowarn;
+ {
+ abi_long rfd_addr, wfd_addr, efd_addr, n, ts_addr;
+ fd_set rfds, wfds, efds;
+ fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;
+ struct timespec ts, *ts_ptr;
+
+ /*
+ * The 6th arg is actually two args smashed together,
+ * so we cannot use the C library.
+ */
+ sigset_t set;
+ struct {
+ sigset_t *set;
+ size_t size;
+ } sig, *sig_ptr;
+
+ abi_ulong arg_sigset, arg_sigsize, *arg7;
+ target_sigset_t *target_sigset;
+
+ n = arg1;
+ rfd_addr = arg2;
+ wfd_addr = arg3;
+ efd_addr = arg4;
+ ts_addr = arg5;
+
+ ret = copy_from_user_fdset_ptr(&rfds, &rfds_ptr, rfd_addr, n);
+ if (ret) {
+ goto fail;
+ }
+ ret = copy_from_user_fdset_ptr(&wfds, &wfds_ptr, wfd_addr, n);
+ if (ret) {
+ goto fail;
+ }
+ ret = copy_from_user_fdset_ptr(&efds, &efds_ptr, efd_addr, n);
+ if (ret) {
+ goto fail;
+ }
+
+ /*
+ * This takes a timespec, and not a timeval, so we cannot
+ * use the do_select() helper ...
+ */
+ if (ts_addr) {
+ if (target_to_host_timespec(&ts, ts_addr)) {
+ goto efault;
+ }
+ ts_ptr = &ts;
+ } else {
+ ts_ptr = NULL;
+ }
+
+ /* Extract the two packed args for the sigset */
+ if (arg6) {
+ sig_ptr = &sig;
+ sig.size = _NSIG / 8;
+
+ arg7 = lock_user(VERIFY_READ, arg6, sizeof(*arg7) * 2, 1);
+ if (!arg7) {
+ goto efault;
+ }
+ arg_sigset = tswapl(arg7[0]);
+ arg_sigsize = tswapl(arg7[1]);
+ unlock_user(arg7, arg6, 0);
+
+ if (arg_sigset) {
+ sig.set = &set;
+ target_sigset = lock_user(VERIFY_READ, arg_sigset,
+ sizeof(*target_sigset), 1);
+ if (!target_sigset) {
+ goto efault;
+ }
+ target_to_host_sigset(&set, target_sigset);
+ unlock_user(target_sigset, arg_sigset, 0);
+ } else {
+ sig.set = NULL;
+ }
+ } else {
+ sig_ptr = NULL;
+ }
+
+ ret = get_errno(sys_pselect6(n, rfds_ptr, wfds_ptr, efds_ptr,
+ ts_ptr, sig_ptr));
+
+ if (!is_error(ret)) {
+ if (rfd_addr && copy_to_user_fdset(rfd_addr, &rfds, n))
+ goto efault;
+ if (wfd_addr && copy_to_user_fdset(wfd_addr, &wfds, n))
+ goto efault;
+ if (efd_addr && copy_to_user_fdset(efd_addr, &efds, n))
+ goto efault;
+
+ if (ts_addr && host_to_target_timespec(ts_addr, &ts))
+ goto efault;
+ }
+ }
+ break;
#endif
case TARGET_NR_symlink:
{
