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https://github.com/edk2-porting/linux-next.git
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89df6bfc04
DEBUG_SHIRQ generates spurious interrupts, triggering handlers such as mconsole_interrupt() or line_interrupt(). They expect data to be available to be read from their sockets/pipes, but in the case of spurious interrupts, the host didn't actually send anything, so UML hangs in read() and friends. Setting those fd's as O_NONBLOCK makes DEBUG_SHIRQ-enabled UML kernels boot and run correctly. Signed-off-by: Eduard-Gabriel Munteanu <maxdamage@aladin.ro> 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>
70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
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* Licensed under the GPL
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*/
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sched.h>
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#include <signal.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include "asm/types.h"
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#include "kern_util.h"
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#include "user.h"
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#include "ubd_user.h"
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#include "os.h"
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#include "cow.h"
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#include <endian.h>
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#include <byteswap.h>
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void ignore_sigwinch_sig(void)
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{
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signal(SIGWINCH, SIG_IGN);
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}
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int start_io_thread(unsigned long sp, int *fd_out)
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{
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int pid, fds[2], err;
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err = os_pipe(fds, 1, 1);
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if(err < 0){
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printk("start_io_thread - os_pipe failed, err = %d\n", -err);
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goto out;
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}
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kernel_fd = fds[0];
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*fd_out = fds[1];
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err = os_set_fd_block(*fd_out, 0);
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if (err) {
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printk("start_io_thread - failed to set nonblocking I/O.\n");
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goto out_close;
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}
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pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM | SIGCHLD,
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NULL);
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if(pid < 0){
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err = -errno;
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printk("start_io_thread - clone failed : errno = %d\n", errno);
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goto out_close;
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}
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return(pid);
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out_close:
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os_close_file(fds[0]);
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os_close_file(fds[1]);
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kernel_fd = -1;
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*fd_out = -1;
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out:
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return err;
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}
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