/*
* Perform a simple write test of our initialized data buffer to the provided
* file descriptor.
*/
static void
aio_write_test(struct aio_context *ac)
{
struct aiocb aio, *aiop;
ssize_t len;
int error;
bzero(&aio, sizeof(aio));
aio.aio_buf = ac->ac_buffer;
aio.aio_nbytes = ac->ac_buflen;
aio.aio_fildes = ac->ac_write_fd;
aio.aio_offset = 0;
aio_timeout_start(ac->ac_test, "aio_write_test", ac->ac_seconds);
if (aio_write(&aio) < 0) {
if (errno == EINTR) {
if (aio_notpresent)
errno = EOPNOTSUPP;
if (aio_timedout) {
aio_cleanup(ac);
errx(-1, "FAIL: %s: aio_write_test: "
"aio_write: timed out", ac->ac_test);
}
}
aio_cleanup(ac);
errx(-1, "FAIL: %s: aio_write_test: aio_write: %s",
ac->ac_test, strerror(errno));
}
len = aio_waitcomplete(&aiop, NULL);
if (len < 0) {
if (errno == EINTR) {
if (aio_notpresent)
errno = EOPNOTSUPP;
if (aio_timedout) {
aio_cleanup(ac);
errx(-1, "FAIL: %s: aio_write_test: "
"aio_waitcomplete: timed out",
ac->ac_test);
}
}
aio_cleanup(ac);
errx(-1, "FAIL: %s: aio_write_test: aio_waitcomplete: %s",
ac->ac_test, strerror(errno));
}
aio_timeout_stop(ac->ac_test, "aio_write_test");
if (len != ac->ac_buflen) {
aio_cleanup(ac);
errx(-1, "FAIL: %s: aio_write_test: aio_waitcomplete: short "
"write (%d)", ac->ac_test, len);
}
}
/*
* Perform a simple write test of our initialized data buffer to the provided
* file descriptor.
*/
static void
aio_write_test(struct aio_context *ac)
{
struct aiocb aio, *aiop;
ssize_t len;
ATF_REQUIRE_KERNEL_MODULE("aio");
bzero(&aio, sizeof(aio));
aio.aio_buf = ac->ac_buffer;
aio.aio_nbytes = ac->ac_buflen;
aio.aio_fildes = ac->ac_write_fd;
aio.aio_offset = 0;
aio_timeout_start(ac->ac_seconds);
if (aio_write(&aio) < 0) {
if (errno == EINTR) {
if (aio_timedout) {
aio_cleanup(ac);
atf_tc_fail("aio_write timed out");
}
}
aio_cleanup(ac);
atf_tc_fail("aio_write failed: %s", strerror(errno));
}
len = aio_waitcomplete(&aiop, NULL);
if (len < 0) {
if (errno == EINTR) {
if (aio_timedout) {
aio_cleanup(ac);
atf_tc_fail("aio_waitcomplete timed out");
}
}
aio_cleanup(ac);
atf_tc_fail("aio_waitcomplete failed: %s", strerror(errno));
}
aio_timeout_stop();
if (len != ac->ac_buflen) {
aio_cleanup(ac);
atf_tc_fail("aio_waitcomplete short write (%jd)",
(intmax_t)len);
}
}
/*
* Post-syscall processing. Perform abnormal system call completion
* actions such as /proc tracing, profiling, signals, preemption, etc.
*
* This routine is called only if t_post_sys, t_sig_check, or t_astflag is set.
* Any condition requiring pre-syscall handling must set one of these.
* If the condition is persistent, this routine will repost t_post_sys.
*/
void
post_syscall(long rval1, long rval2)
{
kthread_t *t = curthread;
klwp_t *lwp = ttolwp(t);
proc_t *p = ttoproc(t);
struct regs *rp = lwptoregs(lwp);
uint_t error;
uint_t code = t->t_sysnum;
int repost = 0;
int proc_stop = 0; /* non-zero if stopping */
int sigprof = 0; /* non-zero if sending SIGPROF */
t->t_post_sys = 0;
error = lwp->lwp_errno;
/*
* Code can be zero if this is a new LWP returning after a forkall(),
* other than the one which matches the one in the parent which called
* forkall(). In these LWPs, skip most of post-syscall activity.
*/
if (code == 0)
goto sig_check;
/*
* If the trace flag is set, mark the lwp to take a single-step trap
* on return to user level (below). The x86 lcall interface and
* sysenter has already done this, and turned off the flag, but
* amd64 syscall interface has not.
*/
if (rp->r_ps & PS_T) {
lwp->lwp_pcb.pcb_flags |= DEBUG_PENDING;
rp->r_ps &= ~PS_T;
aston(curthread);
}
#ifdef C2_AUDIT
if (audit_active) { /* put out audit record for this syscall */
rval_t rval;
/* XX64 -- truncation of 64-bit return values? */
rval.r_val1 = (int)rval1;
rval.r_val2 = (int)rval2;
audit_finish(T_SYSCALL, code, error, &rval);
repost = 1;
}
#endif /* C2_AUDIT */
if (curthread->t_pdmsg != NULL) {
char *m = curthread->t_pdmsg;
uprintf("%s", m);
kmem_free(m, strlen(m) + 1);
curthread->t_pdmsg = NULL;
}
/*
* If we're going to stop for /proc tracing, set the flag and
* save the arguments so that the return values don't smash them.
*/
if (PTOU(p)->u_systrap) {
if (prismember(&PTOU(p)->u_exitmask, code)) {
if (lwp_getdatamodel(lwp) == DATAMODEL_LP64)
(void) save_syscall_args();
proc_stop = 1;
}
repost = 1;
}
/*
* Similarly check to see if SIGPROF might be sent.
*/
if (curthread->t_rprof != NULL &&
curthread->t_rprof->rp_anystate != 0) {
if (lwp_getdatamodel(lwp) == DATAMODEL_LP64)
(void) save_syscall_args();
sigprof = 1;
}
if (lwp->lwp_eosys == NORMALRETURN) {
if (error == 0) {
#ifdef SYSCALLTRACE
if (syscalltrace) {
mutex_enter(&systrace_lock);
printf(
"%d: r_val1=0x%lx, r_val2=0x%lx, id 0x%p\n",
p->p_pid, rval1, rval2, curthread);
mutex_exit(&systrace_lock);
}
#endif /* SYSCALLTRACE */
rp->r_ps &= ~PS_C;
rp->r_r0 = rval1;
rp->r_r1 = rval2;
} else {
int sig;
#ifdef SYSCALLTRACE
if (syscalltrace) {
mutex_enter(&systrace_lock);
printf("%d: error=%d, id 0x%p\n",
p->p_pid, error, curthread);
mutex_exit(&systrace_lock);
}
#endif /* SYSCALLTRACE */
if (error == EINTR && t->t_activefd.a_stale)
error = EBADF;
if (error == EINTR &&
(sig = lwp->lwp_cursig) != 0 &&
sigismember(&PTOU(p)->u_sigrestart, sig) &&
PTOU(p)->u_signal[sig - 1] != SIG_DFL &&
PTOU(p)->u_signal[sig - 1] != SIG_IGN)
error = ERESTART;
rp->r_r0 = error;
rp->r_ps |= PS_C;
}
}
/*
* From the proc(4) manual page:
* When exit from a system call is being traced, the traced process
* stops on completion of the system call just prior to checking for
* signals and returning to user level. At this point all return
* values have been stored into the traced process's saved registers.
*/
if (proc_stop) {
mutex_enter(&p->p_lock);
if (PTOU(p)->u_systrap &&
prismember(&PTOU(p)->u_exitmask, code))
stop(PR_SYSEXIT, code);
mutex_exit(&p->p_lock);
}
/*
* If we are the parent returning from a successful
* vfork, wait for the child to exec or exit.
* This code must be here and not in the bowels of the system
* so that /proc can intercept exit from vfork in a timely way.
*/
if (code == SYS_vfork && rp->r_r1 == 0 && error == 0)
vfwait((pid_t)rval1);
/*
* If profiling is active, bill the current PC in user-land
* and keep reposting until profiling is disabled.
*/
if (p->p_prof.pr_scale) {
if (lwp->lwp_oweupc)
profil_tick(rp->r_pc);
repost = 1;
}
sig_check:
/*
* Reset flag for next time.
* We must do this after stopping on PR_SYSEXIT
* because /proc uses the information in lwp_eosys.
*/
lwp->lwp_eosys = NORMALRETURN;
clear_stale_fd();
t->t_flag &= ~T_FORKALL;
if (t->t_astflag | t->t_sig_check) {
/*
* Turn off the AST flag before checking all the conditions that
* may have caused an AST. This flag is on whenever a signal or
* unusual condition should be handled after the next trap or
* syscall.
*/
astoff(t);
/*
* If a single-step trap occurred on a syscall (see trap())
* recognize it now. Do this before checking for signals
* because deferred_singlestep_trap() may generate a SIGTRAP to
* the LWP or may otherwise mark the LWP to call issig(FORREAL).
*/
if (lwp->lwp_pcb.pcb_flags & DEBUG_PENDING)
deferred_singlestep_trap((caddr_t)rp->r_pc);
t->t_sig_check = 0;
/*
* The following check is legal for the following reasons:
* 1) The thread we are checking, is ourselves, so there is
* no way the proc can go away.
* 2) The only time we need to be protected by the
* lock is if the binding is changed.
*
* Note we will still take the lock and check the binding
* if the condition was true without the lock held. This
* prevents lock contention among threads owned by the
* same proc.
*/
if (curthread->t_proc_flag & TP_CHANGEBIND) {
mutex_enter(&p->p_lock);
if (curthread->t_proc_flag & TP_CHANGEBIND) {
timer_lwpbind();
curthread->t_proc_flag &= ~TP_CHANGEBIND;
}
mutex_exit(&p->p_lock);
}
/*
* for kaio requests on the special kaio poll queue,
* copyout their results to user memory.
*/
if (p->p_aio)
aio_cleanup(0);
/*
* If this LWP was asked to hold, call holdlwp(), which will
* stop. holdlwps() sets this up and calls pokelwps() which
* sets the AST flag.
*
* Also check TP_EXITLWP, since this is used by fresh new LWPs
* through lwp_rtt(). That flag is set if the lwp_create(2)
* syscall failed after creating the LWP.
*/
if (ISHOLD(p) || (t->t_proc_flag & TP_EXITLWP))
holdlwp();
/*
* All code that sets signals and makes ISSIG_PENDING
* evaluate true must set t_sig_check afterwards.
*/
if (ISSIG_PENDING(t, lwp, p)) {
if (issig(FORREAL))
psig();
t->t_sig_check = 1; /* recheck next time */
}
if (sigprof) {
realsigprof(code, error);
t->t_sig_check = 1; /* recheck next time */
}
/*
* If a performance counter overflow interrupt was
* delivered *during* the syscall, then re-enable the
* AST so that we take a trip through trap() to cause
* the SIGEMT to be delivered.
*/
if (lwp->lwp_pcb.pcb_flags & CPC_OVERFLOW)
aston(t);
/*
* /proc can't enable/disable the trace bit itself
* because that could race with the call gate used by
* system calls via "lcall". If that happened, an
* invalid EFLAGS would result. prstep()/prnostep()
* therefore schedule an AST for the purpose.
*/
if (lwp->lwp_pcb.pcb_flags & REQUEST_STEP) {
lwp->lwp_pcb.pcb_flags &= ~REQUEST_STEP;
rp->r_ps |= PS_T;
}
if (lwp->lwp_pcb.pcb_flags & REQUEST_NOSTEP) {
lwp->lwp_pcb.pcb_flags &= ~REQUEST_NOSTEP;
rp->r_ps &= ~PS_T;
}
}
lwp->lwp_errno = 0; /* clear error for next time */
#ifndef NPROBE
/* Kernel probe */
if (tnf_tracing_active) {
TNF_PROBE_3(syscall_end, "syscall thread", /* CSTYLED */,
tnf_long, rval1, rval1,
tnf_long, rval2, rval2,
tnf_long, errno, (long)error);
repost = 1;
}
#endif /* NPROBE */
/*
* Set state to LWP_USER here so preempt won't give us a kernel
* priority if it occurs after this point. Call CL_TRAPRET() to
* restore the user-level priority.
*
* It is important that no locks (other than spinlocks) be entered
* after this point before returning to user mode (unless lwp_state
* is set back to LWP_SYS).
*
* XXX Sampled times past this point are charged to the user.
*/
lwp->lwp_state = LWP_USER;
if (t->t_trapret) {
t->t_trapret = 0;
thread_lock(t);
CL_TRAPRET(t);
thread_unlock(t);
}
if (CPU->cpu_runrun)
preempt();
lwp->lwp_errno = 0; /* clear error for next time */
/*
* The thread lock must be held in order to clear sysnum and reset
* lwp_ap atomically with respect to other threads in the system that
* may be looking at the args via lwp_ap from get_syscall_args().
*/
thread_lock(t);
t->t_sysnum = 0; /* no longer in a system call */
if (lwp_getdatamodel(lwp) == DATAMODEL_NATIVE) {
#if defined(_LP64)
/*
* In case the args were copied to the lwp, reset the
* pointer so the next syscall will have the right
* lwp_ap pointer.
*/
lwp->lwp_ap = (long *)&rp->r_rdi;
} else {
#endif
lwp->lwp_ap = NULL; /* reset on every syscall entry */
}
thread_unlock(t);
lwp->lwp_argsaved = 0;
/*
* If there was a continuing reason for post-syscall processing,
* set the t_post_sys flag for the next system call.
*/
if (repost)
t->t_post_sys = 1;
/*
* If there is a ustack registered for this lwp, and the stack rlimit
* has been altered, read in the ustack. If the saved stack rlimit
* matches the bounds of the ustack, update the ustack to reflect
* the new rlimit. If the new stack rlimit is RLIM_INFINITY, disable
* stack checking by setting the size to 0.
*/
if (lwp->lwp_ustack != 0 && lwp->lwp_old_stk_ctl != 0) {
rlim64_t new_size;
caddr_t top;
stack_t stk;
struct rlimit64 rl;
mutex_enter(&p->p_lock);
new_size = p->p_stk_ctl;
top = p->p_usrstack;
(void) rctl_rlimit_get(rctlproc_legacy[RLIMIT_STACK], p, &rl);
mutex_exit(&p->p_lock);
if (rl.rlim_cur == RLIM64_INFINITY)
new_size = 0;
if (copyin((stack_t *)lwp->lwp_ustack, &stk,
sizeof (stack_t)) == 0 &&
(stk.ss_size == lwp->lwp_old_stk_ctl ||
stk.ss_size == 0) &&
stk.ss_sp == top - stk.ss_size) {
stk.ss_sp = (void *)((uintptr_t)stk.ss_sp +
stk.ss_size - (uintptr_t)new_size);
stk.ss_size = new_size;
(void) copyout(&stk, (stack_t *)lwp->lwp_ustack,
sizeof (stack_t));
}
lwp->lwp_old_stk_ctl = 0;
}
}
