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linux-user: Use safe_syscall for pselect, select syscalls 

Use the safe_syscall wrapper for the pselect and select syscalls.
Since not every architecture has the select syscall, we now
have to implement select in terms of pselect, which means doing
timeval<->timespec conversion.

(Five years on from the initial patch that added pselect support
to QEMU and a decade after pselect6 went into the kernel, it seems
safe to not try to support hosts with header files which don't
define __NR_pselect6.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2016-05-12 18:47:51 +01:00 committed by Riku Voipio
parent ffdcbe223d
commit 6df9d38d33
1 changed files with 19 additions and 17 deletions
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36
linux-user/syscall.c
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@ -430,15 +430,6 @@ _syscall5(int, sys_ppoll, struct pollfd *, fds, nfds_t, nfds,
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
#if defined(TARGET_NR_prlimit64)
#ifndef __NR_prlimit64
# define __NR_prlimit64 -1
@ -704,6 +695,8 @@ safe_syscall4(pid_t, wait4, pid_t, pid, int *, status, int, options, \
safe_syscall5(int, waitid, idtype_t, idtype, id_t, id, siginfo_t *, infop, \
int, options, struct rusage *, rusage)
safe_syscall3(int, execve, const char *, filename, char **, argv, char **, envp)
safe_syscall6(int, pselect6, int, nfds, fd_set *, readfds, fd_set *, writefds, \
fd_set *, exceptfds, struct timespec *, timeout, void *, sig)
static inline int host_to_target_sock_type(int host_type)
{
@ -1115,7 +1108,8 @@ static abi_long do_select(int n,
{
fd_set rfds, wfds, efds;
fd_set *rfds_ptr, *wfds_ptr, *efds_ptr;
struct timeval tv, *tv_ptr;
struct timeval tv;
struct timespec ts, *ts_ptr;
abi_long ret;
ret = copy_from_user_fdset_ptr(&rfds, &rfds_ptr, rfd_addr, n);
@ -1134,12 +1128,15 @@ static abi_long do_select(int n,
if (target_tv_addr) {
if (copy_from_user_timeval(&tv, target_tv_addr))
return -TARGET_EFAULT;
tv_ptr = &tv;
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = tv.tv_usec * 1000;
ts_ptr = &ts;
} else {
tv_ptr = NULL;
ts_ptr = NULL;
}
ret = get_errno(select(n, rfds_ptr, wfds_ptr, efds_ptr, tv_ptr));
ret = get_errno(safe_pselect6(n, rfds_ptr, wfds_ptr, efds_ptr,
ts_ptr, NULL));
if (!is_error(ret)) {
if (rfd_addr && copy_to_user_fdset(rfd_addr, &rfds, n))
@ -1149,8 +1146,13 @@ static abi_long do_select(int n,
if (efd_addr && copy_to_user_fdset(efd_addr, &efds, n))
return -TARGET_EFAULT;
if (target_tv_addr && copy_to_user_timeval(target_tv_addr, &tv))
return -TARGET_EFAULT;
if (target_tv_addr) {
tv.tv_sec = ts.tv_sec;
tv.tv_usec = ts.tv_nsec / 1000;
if (copy_to_user_timeval(target_tv_addr, &tv)) {
return -TARGET_EFAULT;
}
}
}
return ret;
@ -7206,8 +7208,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
sig_ptr = NULL;
}
ret = get_errno(sys_pselect6(n, rfds_ptr, wfds_ptr, efds_ptr,
ts_ptr, sig_ptr));
ret = get_errno(safe_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))