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uml: syle fixes in arch/um/os-Linux

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Style fixes in arch/um/os-Linux/irq.c and arch/um/os-Linux/sigio.c:
	Updated copyrights
	trimmed includes
	added severity indicators to printks
	CodingStyle fixes
	turned an bunch of panics into printks
	call some libc functions directly instead of going through the
os_* wrappers

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2008-02-04 22:31:02 -08:00 • committed by Linus Torvalds
parent 260c0cb886
commit fee64d3c15
2 changed files with 151 additions and 119 deletions
Download patch file Download diff file Expand all files Collapse all files

27
arch/um/os-Linux/irq.c
View file

@ -1,22 +1,19 @@
/* /*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL * Licensed under the GPL
*/ */
#include <stdlib.h> #include <stdlib.h>
#include <unistd.h>
#include <errno.h> #include <errno.h>
#include <poll.h>
#include <signal.h> #include <signal.h>
#include <string.h> #include <string.h>
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/time.h>
#include "user.h"
#include "process.h"
#include "sigio.h"
#include "irq_user.h" #include "irq_user.h"
#include "kern_constants.h"
#include "os.h" #include "os.h"
#include "process.h"
#include "um_malloc.h" #include "um_malloc.h"
#include "user.h"
/* /*
* Locked by irq_lock in arch/um/kernel/irq.c. Changed by os_create_pollfd * Locked by irq_lock in arch/um/kernel/irq.c. Changed by os_create_pollfd
@ -35,7 +32,7 @@ int os_waiting_for_events(struct irq_fd *active_fds)
if (n < 0) { if (n < 0) {
err = -errno; err = -errno;
if (errno != EINTR) if (errno != EINTR)
printk("sigio_handler: os_waiting_for_events:" printk(UM_KERN_ERR "os_waiting_for_events:"
" poll returned %d, errno = %d\n", n, errno); " poll returned %d, errno = %d\n", n, errno);
return err; return err;
} }
@ -94,24 +91,26 @@ void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
struct irq_fd *old_fd = *prev; struct irq_fd *old_fd = *prev;
if ((pollfds[i].fd != -1) && if ((pollfds[i].fd != -1) &&
(pollfds[i].fd != (*prev)->fd)) { (pollfds[i].fd != (*prev)->fd)) {
printk("os_free_irq_by_cb - mismatch between " printk(UM_KERN_ERR "os_free_irq_by_cb - "
"active_fds and pollfds, fd %d vs %d\n", "mismatch between active_fds and "
"pollfds, fd %d vs %d\n",
(*prev)->fd, pollfds[i].fd); (*prev)->fd, pollfds[i].fd);
goto out; goto out;
} }
pollfds_num--; pollfds_num--;
/* This moves the *whole* array after pollfds[i] /*
* This moves the *whole* array after pollfds[i]
* (though it doesn't spot as such)! * (though it doesn't spot as such)!
*/ */
memmove(&pollfds[i], &pollfds[i + 1], memmove(&pollfds[i], &pollfds[i + 1],
(pollfds_num - i) * sizeof(pollfds[0])); (pollfds_num - i) * sizeof(pollfds[0]));
if(*last_irq_ptr2 == &old_fd->next) if (*last_irq_ptr2 == &old_fd->next)
*last_irq_ptr2 = prev; *last_irq_ptr2 = prev;
*prev = (*prev)->next; *prev = (*prev)->next;
if(old_fd->type == IRQ_WRITE) if (old_fd->type == IRQ_WRITE)
ignore_sigio_fd(old_fd->fd); ignore_sigio_fd(old_fd->fd);
kfree(old_fd); kfree(old_fd);
continue; continue;

243
arch/um/os-Linux/sigio.c
View file

@ -1,33 +1,33 @@
/* /*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com) * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL * Licensed under the GPL
*/ */
#include <unistd.h> #include <unistd.h>
#include <stdlib.h>
#include <termios.h>
#include <pty.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h> #include <errno.h>
#include <string.h> #include <fcntl.h>
#include <poll.h>
#include <pty.h>
#include <sched.h> #include <sched.h>
#include <sys/socket.h> #include <signal.h>
#include <sys/poll.h> #include <string.h>
#include "init.h" #include "kern_constants.h"
#include "user.h"
#include "kern_util.h" #include "kern_util.h"
#include "sigio.h" #include "init.h"
#include "os.h" #include "os.h"
#include "sigio.h"
#include "um_malloc.h" #include "um_malloc.h"
#include "user.h"
/* Protected by sigio_lock(), also used by sigio_cleanup, which is an /*
* Protected by sigio_lock(), also used by sigio_cleanup, which is an
* exitcall. * exitcall.
*/ */
static int write_sigio_pid = -1; static int write_sigio_pid = -1;
static unsigned long write_sigio_stack; static unsigned long write_sigio_stack;
/* These arrays are initialized before the sigio thread is started, and /*
* These arrays are initialized before the sigio thread is started, and
* the descriptors closed after it is killed. So, it can't see them change. * the descriptors closed after it is killed. So, it can't see them change.
* On the UML side, they are changed under the sigio_lock. * On the UML side, they are changed under the sigio_lock.
*/ */
@ -42,7 +42,8 @@ struct pollfds {
int used; int used;
}; };
/* Protected by sigio_lock(). Used by the sigio thread, but the UML thread /*
* Protected by sigio_lock(). Used by the sigio thread, but the UML thread
* synchronizes with it. * synchronizes with it.
*/ */
static struct pollfds current_poll; static struct pollfds current_poll;
@ -56,23 +57,26 @@ static int write_sigio_thread(void *unused)
int i, n, respond_fd; int i, n, respond_fd;
char c; char c;
signal(SIGWINCH, SIG_IGN); signal(SIGWINCH, SIG_IGN);
fds = &current_poll; fds = &current_poll;
while(1){ while (1) {
n = poll(fds->poll, fds->used, -1); n = poll(fds->poll, fds->used, -1);
if(n < 0){ if (n < 0) {
if(errno == EINTR) continue; if (errno == EINTR)
printk("write_sigio_thread : poll returned %d, " continue;
"errno = %d\n", n, errno); printk(UM_KERN_ERR "write_sigio_thread : poll returned "
"%d, errno = %d\n", n, errno);
} }
for(i = 0; i < fds->used; i++){ for (i = 0; i < fds->used; i++) {
p = &fds->poll[i]; p = &fds->poll[i];
if(p->revents == 0) continue; if (p->revents == 0)
if(p->fd == sigio_private[1]){ continue;
if (p->fd == sigio_private[1]) {
CATCH_EINTR(n = read(sigio_private[1], &c, CATCH_EINTR(n = read(sigio_private[1], &c,
sizeof(c))); sizeof(c)));
if(n != sizeof(c)) if (n != sizeof(c))
printk("write_sigio_thread : " printk(UM_KERN_ERR
"write_sigio_thread : "
"read on socket failed, " "read on socket failed, "
"err = %d\n", errno); "err = %d\n", errno);
tmp = current_poll; tmp = current_poll;
@ -88,9 +92,10 @@ static int write_sigio_thread(void *unused)
} }
CATCH_EINTR(n = write(respond_fd, &c, sizeof(c))); CATCH_EINTR(n = write(respond_fd, &c, sizeof(c)));
if(n != sizeof(c)) if (n != sizeof(c))
printk("write_sigio_thread : write on socket " printk(UM_KERN_ERR "write_sigio_thread : "
"failed, err = %d\n", errno); "write on socket failed, err = %d\n",
errno);
} }
} }
@ -101,12 +106,13 @@ static int need_poll(struct pollfds *polls, int n)
{ {
struct pollfd *new; struct pollfd *new;
if(n <= polls->size) if (n <= polls->size)
return 0; return 0;
new = kmalloc(n * sizeof(struct pollfd), UM_GFP_ATOMIC); new = kmalloc(n * sizeof(struct pollfd), UM_GFP_ATOMIC);
if(new == NULL){ if (new == NULL) {
printk("need_poll : failed to allocate new pollfds\n"); printk(UM_KERN_ERR "need_poll : failed to allocate new "
"pollfds\n");
return -ENOMEM; return -ENOMEM;
} }
@ -118,7 +124,8 @@ static int need_poll(struct pollfds *polls, int n)
return 0; return 0;
} }
/* Must be called with sigio_lock held, because it's needed by the marked /*
* Must be called with sigio_lock held, because it's needed by the marked
* critical section. * critical section.
*/ */
static void update_thread(void) static void update_thread(void)
@ -128,15 +135,17 @@ static void update_thread(void)
char c; char c;
flags = set_signals(0); flags = set_signals(0);
n = write(sigio_private[0], &c, sizeof(c)); CATCH_EINTR(n = write(sigio_private[0], &c, sizeof(c)));
if(n != sizeof(c)){ if (n != sizeof(c)) {
printk("update_thread : write failed, err = %d\n", errno); printk(UM_KERN_ERR "update_thread : write failed, err = %d\n",
errno);
goto fail; goto fail;
} }
CATCH_EINTR(n = read(sigio_private[0], &c, sizeof(c))); CATCH_EINTR(n = read(sigio_private[0], &c, sizeof(c)));
if(n != sizeof(c)){ if (n != sizeof(c)) {
printk("update_thread : read failed, err = %d\n", errno); printk(UM_KERN_ERR "update_thread : read failed, err = %d\n",
errno);
goto fail; goto fail;
} }
@ -163,23 +172,23 @@ int add_sigio_fd(int fd)
int err = 0, i, n; int err = 0, i, n;
sigio_lock(); sigio_lock();
for(i = 0; i < all_sigio_fds.used; i++){ for (i = 0; i < all_sigio_fds.used; i++) {
if(all_sigio_fds.poll[i].fd == fd) if (all_sigio_fds.poll[i].fd == fd)
break; break;
} }
if(i == all_sigio_fds.used) if (i == all_sigio_fds.used)
goto out; goto out;
p = &all_sigio_fds.poll[i]; p = &all_sigio_fds.poll[i];
for(i = 0; i < current_poll.used; i++){ for (i = 0; i < current_poll.used; i++) {
if(current_poll.poll[i].fd == fd) if (current_poll.poll[i].fd == fd)
goto out; goto out;
} }
n = current_poll.used; n = current_poll.used;
err = need_poll(&next_poll, n + 1); err = need_poll(&next_poll, n + 1);
if(err) if (err)
goto out; goto out;
memcpy(next_poll.poll, current_poll.poll, memcpy(next_poll.poll, current_poll.poll,
@ -197,27 +206,29 @@ int ignore_sigio_fd(int fd)
struct pollfd *p; struct pollfd *p;
int err = 0, i, n = 0; int err = 0, i, n = 0;
/* This is called from exitcalls elsewhere in UML - if /*
* This is called from exitcalls elsewhere in UML - if
* sigio_cleanup has already run, then update_thread will hang * sigio_cleanup has already run, then update_thread will hang
* or fail because the thread is no longer running. * or fail because the thread is no longer running.
*/ */
if(write_sigio_pid == -1) if (write_sigio_pid == -1)
return -EIO; return -EIO;
sigio_lock(); sigio_lock();
for(i = 0; i < current_poll.used; i++){ for (i = 0; i < current_poll.used; i++) {
if(current_poll.poll[i].fd == fd) break; if (current_poll.poll[i].fd == fd)
break;
} }
if(i == current_poll.used) if (i == current_poll.used)
goto out; goto out;
err = need_poll(&next_poll, current_poll.used - 1); err = need_poll(&next_poll, current_poll.used - 1);
if(err) if (err)
goto out; goto out;
for(i = 0; i < current_poll.used; i++){ for (i = 0; i < current_poll.used; i++) {
p = &current_poll.poll[i]; p = &current_poll.poll[i];
if(p->fd != fd) if (p->fd != fd)
next_poll.poll[n++] = *p; next_poll.poll[n++] = *p;
} }
next_poll.used = current_poll.used - 1; next_poll.used = current_poll.used - 1;
@ -234,7 +245,8 @@ static struct pollfd *setup_initial_poll(int fd)
p = kmalloc(sizeof(struct pollfd), UM_GFP_KERNEL); p = kmalloc(sizeof(struct pollfd), UM_GFP_KERNEL);
if (p == NULL) { if (p == NULL) {
printk("setup_initial_poll : failed to allocate poll\n"); printk(UM_KERN_ERR "setup_initial_poll : failed to allocate "
"poll\n");
return NULL; return NULL;
} }
*p = ((struct pollfd) { .fd = fd, *p = ((struct pollfd) { .fd = fd,
@ -260,27 +272,29 @@ static void write_sigio_workaround(void)
return; return;
err = os_pipe(l_write_sigio_fds, 1, 1); err = os_pipe(l_write_sigio_fds, 1, 1);
if(err < 0){ if (err < 0) {
printk("write_sigio_workaround - os_pipe 1 failed, " printk(UM_KERN_ERR "write_sigio_workaround - os_pipe 1 failed, "
"err = %d\n", -err); "err = %d\n", -err);
return; return;
} }
err = os_pipe(l_sigio_private, 1, 1); err = os_pipe(l_sigio_private, 1, 1);
if(err < 0){ if (err < 0) {
printk("write_sigio_workaround - os_pipe 2 failed, " printk(UM_KERN_ERR "write_sigio_workaround - os_pipe 2 failed, "
"err = %d\n", -err); "err = %d\n", -err);
goto out_close1; goto out_close1;
} }
p = setup_initial_poll(l_sigio_private[1]); p = setup_initial_poll(l_sigio_private[1]);
if(!p) if (!p)
goto out_close2; goto out_close2;
sigio_lock(); sigio_lock();
/* Did we race? Don't try to optimize this, please, it's not so likely /*
* to happen, and no more than once at the boot. */ * Did we race? Don't try to optimize this, please, it's not so likely
if(write_sigio_pid != -1) * to happen, and no more than once at the boot.
*/
if (write_sigio_pid != -1)
goto out_free; goto out_free;
current_poll = ((struct pollfds) { .poll = p, current_poll = ((struct pollfds) { .poll = p,
@ -332,19 +346,19 @@ void maybe_sigio_broken(int fd, int read)
{ {
int err; int err;
if(!isatty(fd)) if (!isatty(fd))
return; return;
if((read || pty_output_sigio) && (!read || pty_close_sigio)) if ((read || pty_output_sigio) && (!read || pty_close_sigio))
return; return;
write_sigio_workaround(); write_sigio_workaround();
sigio_lock(); sigio_lock();
err = need_poll(&all_sigio_fds, all_sigio_fds.used + 1); err = need_poll(&all_sigio_fds, all_sigio_fds.used + 1);
if(err){ if (err) {
printk("maybe_sigio_broken - failed to add pollfd for " printk(UM_KERN_ERR "maybe_sigio_broken - failed to add pollfd "
"descriptor %d\n", fd); "for descriptor %d\n", fd);
goto out; goto out;
} }
@ -387,7 +401,7 @@ static void openpty_cb(void *arg)
struct openpty_arg *info = arg; struct openpty_arg *info = arg;
info->err = 0; info->err = 0;
if(openpty(&info->master, &info->slave, NULL, NULL, NULL)) if (openpty(&info->master, &info->slave, NULL, NULL, NULL))
info->err = -errno; info->err = -errno;
} }
@ -396,14 +410,14 @@ static int async_pty(int master, int slave)
int flags; int flags;
flags = fcntl(master, F_GETFL); flags = fcntl(master, F_GETFL);
if(flags < 0) if (flags < 0)
return -errno; return -errno;
if((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) || if ((fcntl(master, F_SETFL, flags | O_NONBLOCK | O_ASYNC) < 0) ||
(fcntl(master, F_SETOWN, os_getpid()) < 0)) (fcntl(master, F_SETOWN, os_getpid()) < 0))
return -errno; return -errno;
if((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0)) if ((fcntl(slave, F_SETFL, flags | O_NONBLOCK) < 0))
return -errno; return -errno;
return 0; return 0;
@ -416,34 +430,49 @@ static void __init check_one_sigio(void (*proc)(int, int))
int master, slave, err; int master, slave, err;
initial_thread_cb(openpty_cb, &pty); initial_thread_cb(openpty_cb, &pty);
if(pty.err){ if (pty.err) {
printk("openpty failed, errno = %d\n", -pty.err); printk(UM_KERN_ERR "check_one_sigio failed, errno = %d\n",
-pty.err);
return; return;
} }
master = pty.master; master = pty.master;
slave = pty.slave; slave = pty.slave;
if((master == -1) || (slave == -1)){ if ((master == -1) || (slave == -1)) {
printk("openpty failed to allocate a pty\n"); printk(UM_KERN_ERR "check_one_sigio failed to allocate a "
"pty\n");
return; return;
} }
/* Not now, but complain so we now where we failed. */ /* Not now, but complain so we now where we failed. */
err = raw(master); err = raw(master);
if (err < 0) if (err < 0) {
panic("check_sigio : __raw failed, errno = %d\n", -err); printk(UM_KERN_ERR "check_one_sigio : raw failed, errno = %d\n",
-err);
return;
}
err = async_pty(master, slave); err = async_pty(master, slave);
if(err < 0) if (err < 0) {
panic("tty_fds : sigio_async failed, err = %d\n", -err); printk(UM_KERN_ERR "check_one_sigio : sigio_async failed, "
"err = %d\n", -err);
return;
}
if (sigaction(SIGIO, NULL, &old) < 0) {
printk(UM_KERN_ERR "check_one_sigio : sigaction 1 failed, "
"errno = %d\n", errno);
return;
}
if(sigaction(SIGIO, NULL, &old) < 0)
panic("check_sigio : sigaction 1 failed, errno = %d\n", errno);
new = old; new = old;
new.sa_handler = handler; new.sa_handler = handler;
if(sigaction(SIGIO, &new, NULL) < 0) if (sigaction(SIGIO, &new, NULL) < 0) {
panic("check_sigio : sigaction 2 failed, errno = %d\n", errno); printk(UM_KERN_ERR "check_one_sigio : sigaction 2 failed, "
"errno = %d\n", errno);
return;
}
got_sigio = 0; got_sigio = 0;
(*proc)(master, slave); (*proc)(master, slave);
@ -451,8 +480,9 @@ static void __init check_one_sigio(void (*proc)(int, int))
close(master); close(master);
close(slave); close(slave);
if(sigaction(SIGIO, &old, NULL) < 0) if (sigaction(SIGIO, &old, NULL) < 0)
panic("check_sigio : sigaction 3 failed, errno = %d\n", errno); printk(UM_KERN_ERR "check_one_sigio : sigaction 3 failed, "
"errno = %d\n", errno);
} }
static void tty_output(int master, int slave) static void tty_output(int master, int slave)
@ -460,42 +490,45 @@ static void tty_output(int master, int slave)
int n; int n;
char buf[512]; char buf[512];
printk("Checking that host ptys support output SIGIO..."); printk(UM_KERN_INFO "Checking that host ptys support output SIGIO...");
memset(buf, 0, sizeof(buf)); memset(buf, 0, sizeof(buf));
while(write(master, buf, sizeof(buf)) > 0) ; while (write(master, buf, sizeof(buf)) > 0) ;
if(errno != EAGAIN) if (errno != EAGAIN)
panic("tty_output : write failed, errno = %d\n", errno); printk(UM_KERN_ERR "tty_output : write failed, errno = %d\n",
while(((n = read(slave, buf, sizeof(buf))) > 0) && !got_sigio) ; errno);
while (((n = read(slave, buf, sizeof(buf))) > 0) && !got_sigio)
;
if(got_sigio){ if (got_sigio) {
printk("Yes\n"); printk(UM_KERN_CONT "Yes\n");
pty_output_sigio = 1; pty_output_sigio = 1;
} } else if (n == -EAGAIN)
else if(n == -EAGAIN) printk(UM_KERN_CONT "No, enabling workaround\n");
printk("No, enabling workaround\n"); else
else panic("tty_output : read failed, err = %d\n", n); printk(UM_KERN_CONT "tty_output : read failed, err = %d\n", n);
} }
static void tty_close(int master, int slave) static void tty_close(int master, int slave)
{ {
printk("Checking that host ptys support SIGIO on close..."); printk(UM_KERN_INFO "Checking that host ptys support SIGIO on "
"close...");
close(slave); close(slave);
if(got_sigio){ if (got_sigio) {
printk("Yes\n"); printk(UM_KERN_CONT "Yes\n");
pty_close_sigio = 1; pty_close_sigio = 1;
} } else
else printk("No, enabling workaround\n"); printk(UM_KERN_CONT "No, enabling workaround\n");
} }
void __init check_sigio(void) void __init check_sigio(void)
{ {
if((os_access("/dev/ptmx", OS_ACC_R_OK) < 0) && if ((access("/dev/ptmx", R_OK) < 0) &&
(os_access("/dev/ptyp0", OS_ACC_R_OK) < 0)){ (access("/dev/ptyp0", R_OK) < 0)) {
printk("No pseudo-terminals available - skipping pty SIGIO " printk(UM_KERN_WARNING "No pseudo-terminals available - "
"check\n"); "skipping pty SIGIO check\n");
return; return;
} }
check_one_sigio(tty_output); check_one_sigio(tty_output);