diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/um/include/os.h | 1 | ||||
| -rw-r--r-- | arch/um/include/sigio.h | 1 | ||||
| -rw-r--r-- | arch/um/kernel/sigio_kern.c | 10 | ||||
| -rw-r--r-- | arch/um/kernel/sigio_user.c | 162 | ||||
| -rw-r--r-- | arch/um/kernel/um_arch.c | 3 | ||||
| -rw-r--r-- | arch/um/os-Linux/start_up.c | 128 |
6 files changed, 148 insertions, 157 deletions
diff --git a/arch/um/include/os.h b/arch/um/include/os.h index efae3e6acb5..6d865d4eade 100644 --- a/arch/um/include/os.h +++ b/arch/um/include/os.h @@ -161,6 +161,7 @@ extern int os_lock_file(int fd, int excl); /* start_up.c */ extern void os_early_checks(void); extern int can_do_skas(void); +extern void os_check_bugs(void); /* Make sure they are clear when running in TT mode. Required by * SEGV_MAYBE_FIXABLE */ diff --git a/arch/um/include/sigio.h b/arch/um/include/sigio.h index 37d76e29a14..1432fcfb321 100644 --- a/arch/um/include/sigio.h +++ b/arch/um/include/sigio.h @@ -8,7 +8,6 @@ extern int write_sigio_irq(int fd); extern int register_sigio_fd(int fd); -extern int read_sigio_fd(int fd); extern int add_sigio_fd(int fd, int read); extern int ignore_sigio_fd(int fd); extern void sigio_lock(void); diff --git a/arch/um/kernel/sigio_kern.c b/arch/um/kernel/sigio_kern.c index 229988463c4..1c1300fb1e9 100644 --- a/arch/um/kernel/sigio_kern.c +++ b/arch/um/kernel/sigio_kern.c @@ -1,4 +1,4 @@ -/* +/* * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com) * Licensed under the GPL */ @@ -12,13 +12,16 @@ #include "sigio.h" #include "irq_user.h" #include "irq_kern.h" +#include "os.h" /* Protected by sigio_lock() called from write_sigio_workaround */ static int sigio_irq_fd = -1; static irqreturn_t sigio_interrupt(int irq, void *data, struct pt_regs *unused) { - read_sigio_fd(sigio_irq_fd); + char c; + + os_read_file(sigio_irq_fd, &c, sizeof(c)); reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ); return(IRQ_HANDLED); } @@ -51,6 +54,9 @@ void sigio_unlock(void) spin_unlock(&sigio_spinlock); } +extern void sigio_cleanup(void); +__uml_exitcall(sigio_cleanup); + /* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically diff --git a/arch/um/kernel/sigio_user.c b/arch/um/kernel/sigio_user.c index f7b18e157d3..9bef9413cb5 100644 --- a/arch/um/kernel/sigio_user.c +++ b/arch/um/kernel/sigio_user.c @@ -1,4 +1,4 @@ -/* +/* * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) * Licensed under the GPL */ @@ -20,127 +20,6 @@ #include "sigio.h" #include "os.h" -/* Changed during early boot */ -int pty_output_sigio = 0; -int pty_close_sigio = 0; - -/* Used as a flag during SIGIO testing early in boot */ -static volatile int got_sigio = 0; - -void __init handler(int sig) -{ - got_sigio = 1; -} - -struct openpty_arg { - int master; - int slave; - int err; -}; - -static void openpty_cb(void *arg) -{ - struct openpty_arg *info = arg; - - info->err = 0; - if(openpty(&info->master, &info->slave, NULL, NULL, NULL)) - info->err = -errno; -} - -void __init check_one_sigio(void (*proc)(int, int)) -{ - struct sigaction old, new; - struct openpty_arg pty = { .master = -1, .slave = -1 }; - int master, slave, err; - - initial_thread_cb(openpty_cb, &pty); - if(pty.err){ - printk("openpty failed, errno = %d\n", -pty.err); - return; - } - - master = pty.master; - slave = pty.slave; - - if((master == -1) || (slave == -1)){ - printk("openpty failed to allocate a pty\n"); - return; - } - - /* Not now, but complain so we now where we failed. */ - err = raw(master); - if (err < 0) - panic("check_sigio : __raw failed, errno = %d\n", -err); - - err = os_sigio_async(master, slave); - if(err < 0) - panic("tty_fds : sigio_async failed, err = %d\n", -err); - - if(sigaction(SIGIO, NULL, &old) < 0) - panic("check_sigio : sigaction 1 failed, errno = %d\n", errno); - new = old; - new.sa_handler = handler; - if(sigaction(SIGIO, &new, NULL) < 0) - panic("check_sigio : sigaction 2 failed, errno = %d\n", errno); - - got_sigio = 0; - (*proc)(master, slave); - - os_close_file(master); - os_close_file(slave); - - if(sigaction(SIGIO, &old, NULL) < 0) - panic("check_sigio : sigaction 3 failed, errno = %d\n", errno); -} - -static void tty_output(int master, int slave) -{ - int n; - char buf[512]; - - printk("Checking that host ptys support output SIGIO..."); - - memset(buf, 0, sizeof(buf)); - - while(os_write_file(master, buf, sizeof(buf)) > 0) ; - if(errno != EAGAIN) - panic("check_sigio : write failed, errno = %d\n", errno); - while(((n = os_read_file(slave, buf, sizeof(buf))) > 0) && !got_sigio) ; - - if (got_sigio) { - printk("Yes\n"); - pty_output_sigio = 1; - } else if (n == -EAGAIN) { - printk("No, enabling workaround\n"); - } else { - panic("check_sigio : read failed, err = %d\n", n); - } -} - -static void tty_close(int master, int slave) -{ - printk("Checking that host ptys support SIGIO on close..."); - - os_close_file(slave); - if(got_sigio){ - printk("Yes\n"); - pty_close_sigio = 1; - } - else printk("No, enabling workaround\n"); -} - -void __init check_sigio(void) -{ - if((os_access("/dev/ptmx", OS_ACC_R_OK) < 0) && - (os_access("/dev/ptyp0", OS_ACC_R_OK) < 0)){ - printk("No pseudo-terminals available - skipping pty SIGIO " - "check\n"); - return; - } - check_one_sigio(tty_output); - check_one_sigio(tty_close); -} - /* Protected by sigio_lock(), also used by sigio_cleanup, which is an * exitcall. */ @@ -267,10 +146,10 @@ static void update_thread(void) if(write_sigio_pid != -1) os_kill_process(write_sigio_pid, 1); write_sigio_pid = -1; - os_close_file(sigio_private[0]); - os_close_file(sigio_private[1]); - os_close_file(write_sigio_fds[0]); - os_close_file(write_sigio_fds[1]); + close(sigio_private[0]); + close(sigio_private[1]); + close(write_sigio_fds[0]); + close(write_sigio_fds[1]); /* Critical section end */ set_signals(flags); } @@ -428,39 +307,18 @@ void write_sigio_workaround(void) out_free: kfree(p); out_close2: - os_close_file(l_sigio_private[0]); - os_close_file(l_sigio_private[1]); + close(l_sigio_private[0]); + close(l_sigio_private[1]); out_close1: - os_close_file(l_write_sigio_fds[0]); - os_close_file(l_write_sigio_fds[1]); + close(l_write_sigio_fds[0]); + close(l_write_sigio_fds[1]); return; } -int read_sigio_fd(int fd) -{ - int n; - char c; - - n = os_read_file(fd, &c, sizeof(c)); - if(n != sizeof(c)){ - if(n < 0) { - printk("read_sigio_fd - read failed, err = %d\n", -n); - return(n); - } - else { - printk("read_sigio_fd - short read, bytes = %d\n", n); - return(-EIO); - } - } - return(n); -} - -static void sigio_cleanup(void) +void sigio_cleanup(void) { if (write_sigio_pid != -1) { os_kill_process(write_sigio_pid, 1); write_sigio_pid = -1; } } - -__uml_exitcall(sigio_cleanup); diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c index 0c5b9dcfbe2..bb1c87211ac 100644 --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -487,8 +487,7 @@ void __init setup_arch(char **cmdline_p) void __init check_bugs(void) { arch_check_bugs(); - check_sigio(); - check_devanon(); + os_check_bugs(); } void apply_alternatives(struct alt_instr *start, struct alt_instr *end) diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c index 829d6b0d8b0..32753131f8d 100644 --- a/arch/um/os-Linux/start_up.c +++ b/arch/um/os-Linux/start_up.c @@ -3,6 +3,7 @@ * Licensed under the GPL */ +#include <pty.h> #include <stdio.h> #include <stddef.h> #include <stdarg.h> @@ -539,3 +540,130 @@ int __init parse_iomem(char *str, int *add) return(1); } + +/* Changed during early boot */ +int pty_output_sigio = 0; +int pty_close_sigio = 0; + +/* Used as a flag during SIGIO testing early in boot */ +static volatile int got_sigio = 0; + +static void __init handler(int sig) +{ + got_sigio = 1; +} + +struct openpty_arg { + int master; + int slave; + int err; +}; + +static void openpty_cb(void *arg) +{ + struct openpty_arg *info = arg; + + info->err = 0; + if(openpty(&info->master, &info->slave, NULL, NULL, NULL)) + info->err = -errno; +} + +static void __init check_one_sigio(void (*proc)(int, int)) +{ + struct sigaction old, new; + struct openpty_arg pty = { .master = -1, .slave = -1 }; + int master, slave, err; + + initial_thread_cb(openpty_cb, &pty); + if(pty.err){ + printk("openpty failed, errno = %d\n", -pty.err); + return; + } + + master = pty.master; + slave = pty.slave; + + if((master == -1) || (slave == -1)){ + printk("openpty failed to allocate a pty\n"); + return; + } + + /* Not now, but complain so we now where we failed. */ + err = raw(master); + if (err < 0) + panic("check_sigio : __raw failed, errno = %d\n", -err); + + err = os_sigio_async(master, slave); + if(err < 0) + panic("tty_fds : sigio_async failed, err = %d\n", -err); + + if(sigaction(SIGIO, NULL, &old) < 0) + panic("check_sigio : sigaction 1 failed, errno = %d\n", errno); + new = old; + new.sa_handler = handler; + if(sigaction(SIGIO, &new, NULL) < 0) + panic("check_sigio : sigaction 2 failed, errno = %d\n", errno); + + got_sigio = 0; + (*proc)(master, slave); + + close(master); + close(slave); + + if(sigaction(SIGIO, &old, NULL) < 0) + panic("check_sigio : sigaction 3 failed, errno = %d\n", errno); +} + +static void tty_output(int master, int slave) +{ + int n; + char buf[512]; + + printk("Checking that host ptys support output SIGIO..."); + + memset(buf, 0, sizeof(buf)); + + while(os_write_file(master, buf, sizeof(buf)) > 0) ; + if(errno != EAGAIN) + panic("check_sigio : write failed, errno = %d\n", errno); + while(((n = os_read_file(slave, buf, sizeof(buf))) > 0) && !got_sigio) ; + + if(got_sigio){ + printk("Yes\n"); + pty_output_sigio = 1; + } + else if(n == -EAGAIN) printk("No, enabling workaround\n"); + else panic("check_sigio : read failed, err = %d\n", n); +} + +static void tty_close(int master, int slave) +{ + printk("Checking that host ptys support SIGIO on close..."); + + close(slave); + if(got_sigio){ + printk("Yes\n"); + pty_close_sigio = 1; + } + else printk("No, enabling workaround\n"); +} + +void __init check_sigio(void) +{ + if((os_access("/dev/ptmx", OS_ACC_R_OK) < 0) && + (os_access("/dev/ptyp0", OS_ACC_R_OK) < 0)){ + printk("No pseudo-terminals available - skipping pty SIGIO " + "check\n"); + return; + } + check_one_sigio(tty_output); + check_one_sigio(tty_close); +} + +void os_check_bugs(void) +{ + check_ptrace(); + check_sigio(); + check_devanon(); +} + |