Define SIG_HOLD.
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/* Signal number definitions. Solaris 2 version.
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Copyright (C) 1994, 1996 Free Software Foundation, Inc.
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Copyright (C) 1994, 1996, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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#define SIG_ERR ((__sighandler_t) -1) /* Error return. */
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#define SIG_DFL ((__sighandler_t) 0) /* Default action. */
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#define SIG_IGN ((__sighandler_t) 1) /* Ignore signal. */
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#ifdef __USE_UNIX98
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# define SIG_HOLD ((__sighandler_t) 2) /* Add signal to hold mask. */
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#endif
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/* Signals. */
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