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author | Steven Whitehouse <swhiteho@redhat.com> | 2006-07-17 09:25:26 -0400 |
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committer | Steven Whitehouse <swhiteho@redhat.com> | 2006-07-17 09:25:26 -0400 |
commit | 4bf311ddfbffe12d41ad1a3c311ab727db6f72cb (patch) | |
tree | 9d19a2774e83637d86dc876f3af22af1dacf0bec /arch/um/kernel/sigio.c | |
parent | 597d0cae0f99f62501e229bed50e8149604015bb (diff) | |
parent | 82d6897fefca6206bca7153805b4c5359ce97fc4 (diff) | |
download | linux-stable-4bf311ddfbffe12d41ad1a3c311ab727db6f72cb.tar.gz |
Merge branch 'master'
Diffstat (limited to 'arch/um/kernel/sigio.c')
-rw-r--r-- | arch/um/kernel/sigio.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/um/kernel/sigio.c b/arch/um/kernel/sigio.c new file mode 100644 index 000000000000..0ad755ceb212 --- /dev/null +++ b/arch/um/kernel/sigio.c @@ -0,0 +1,55 @@ +/* + * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com) + * Licensed under the GPL + */ + +#include "linux/kernel.h" +#include "linux/list.h" +#include "linux/slab.h" +#include "linux/signal.h" +#include "linux/interrupt.h" +#include "init.h" +#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) +{ + char c; + + os_read_file(sigio_irq_fd, &c, sizeof(c)); + reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ); + return(IRQ_HANDLED); +} + +int write_sigio_irq(int fd) +{ + int err; + + err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt, + IRQF_DISABLED|IRQF_SAMPLE_RANDOM, "write sigio", + NULL); + if(err){ + printk("write_sigio_irq : um_request_irq failed, err = %d\n", + err); + return(-1); + } + sigio_irq_fd = fd; + return(0); +} + +static DEFINE_SPINLOCK(sigio_spinlock); + +void sigio_lock(void) +{ + spin_lock(&sigio_spinlock); +} + +void sigio_unlock(void) +{ + spin_unlock(&sigio_spinlock); +} |