enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/arch/um/os-Linux/sigio.c
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@@ -1,6 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2002 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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- * Licensed under the GPL
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  */
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 #include <unistd.h>
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@@ -132,7 +132,7 @@
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 	int n;
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 	char c;
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-	flags = set_signals(0);
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+	flags = set_signals_trace(0);
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 	CATCH_EINTR(n = write(sigio_private[0], &c, sizeof(c)));
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 	if (n != sizeof(c)) {
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 		printk(UM_KERN_ERR "update_thread : write failed, err = %d\n",
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@@ -147,7 +147,7 @@
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 		goto fail;
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 	}
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-	set_signals(flags);
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+	set_signals_trace(flags);
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 	return;
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  fail:
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 	/* Critical section start */
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@@ -161,7 +161,7 @@
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 	close(write_sigio_fds[0]);
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 	close(write_sigio_fds[1]);
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 	/* Critical section end */
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-	set_signals(flags);
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+	set_signals_trace(flags);
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 }
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 int add_sigio_fd(int fd)