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diff --git a/sysdeps/unix/sysv/irix4/signum.h b/sysdeps/unix/sysv/irix4/signum.h
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+++ b/sysdeps/unix/sysv/irix4/signum.h
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+/* Copyright (C) 1992, 1993 Free Software Foundation, Inc.
+   Contributed by Brendan Kehoe (brendan@cygnus.com).
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifdef _SIGNAL_H
+
+/* This file defines the fake signal functions and signal
+   number constants for System V Release 4 UNIX.  */
+
+/* Fake signal functions.  */
+#define        SIG_ERR ((__sighandler_t) -1)
+#define        SIG_DFL ((__sighandler_t) 0)
+#define        SIG_IGN ((__sighandler_t) 1)
+
+
+/* Signals.  */
+#define        SIGHUP          1       /* Hangup (POSIX).  */
+#define        SIGINT          2       /* Interrupt (ANSI).  */
+#define        SIGQUIT         3       /* Quit (POSIX).  */
+#define        SIGILL          4       /* Illegal instruction (ANSI).  */
+#define        SIGABRT         SIGIOT  /* Abort (ANSI).  */
+#define        SIGTRAP         5       /* Trace trap (POSIX).  */
+#define        SIGIOT          6       /* IOT trap.  */
+#define        SIGEMT          7       /* EMT trap.  */
+#define        SIGFPE          8       /* Floating-point exception (ANSI).  */
+#define        SIGKILL         9       /* Kill, unblockable (POSIX).  */
+#define        SIGBUS          10      /* Bus error.  */
+#define        SIGSEGV         11      /* Segmentation violation (ANSI).  */
+#define        SIGSYS          12      /* Bad argument to system call*/
+#define        SIGPIPE         13      /* Broken pipe (POSIX).  */
+#define        SIGALRM         14      /* Alarm clock (POSIX).  */
+#define        SIGTERM         15      /* Termination (ANSI).  */
+#define        SIGUSR1         16      /* User-defined signal 1 (POSIX).  */
+#define        SIGUSR2         17      /* User-defined signal 2 (POSIX).  */
+#define        SIGCHLD         18      /* Child status has changed (POSIX).  */
+#define        SIGCLD          SIGCHLD /* Same as SIGCHLD (System V).  */
+#define SIGPWR         19      /* Power going down.  */
+#define        SIGSTOP         20      /* Stop, unblockable (POSIX).  */
+#define        SIGTSTP         21      /* Keyboard stop (POSIX).  */
+#define        SIGPOLL         22      /* Same as SIGIO? (SVID).  */
+#define        SIGIO           23      /* I/O now possible.  */
+#define        SIGURG          24      /* Urgent condition on socket.*/
+#define        SIGWINCH        25      /* Window size change.  */
+#define        SIGVTALRM       26      /* Virtual alarm clock.  */
+#define        SIGPROF         27      /* Profiling alarm clock.  */
+#define        SIGCONT         28      /* Continue (POSIX).  */
+#define        SIGTTIN         29      /* Background read from tty (POSIX).  */
+#define        SIGTTOU         30      /* Background write to tty (POSIX).  */
+#define        SIGXCPU         31      /* CPU limit exceeded.  */
+#define        SIGXFSZ         32      /* File size limit exceeded.  */
+
+#endif /* <signal.h> included.  */
+
+#define        _NSIG           33      /* Biggest signal number + 1.  */