feat(userspace/libc): support for linux target

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Userspace/libc/abis/linux/x86_64/bits/signal.h

@@ -0,0 +1,74 @@
+/*
+	This file is part of Fennix C Library.
+
+	Fennix C Library is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix 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 General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix C Library. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef _BITS_SIGNAL_H
+#define _BITS_SIGNAL_H
+
+typedef unsigned long sigset_t;
+
+#define NSIG 32
+
+#define SIGHUP 1
+#define SIGINT 2
+#define SIGQUIT 3
+#define SIGILL 4
+#define SIGTRAP 5
+#define SIGABRT 6
+#define SIGIOT 6
+#define SIGBUS 7
+#define SIGFPE 8
+#define SIGKILL 9
+#define SIGUSR1 10
+#define SIGSEGV 11
+#define SIGUSR2 12
+#define SIGPIPE 13
+#define SIGALRM 14
+#define SIGTERM 15
+#define SIGSTKFLT 16
+#define SIGCHLD 17
+#define SIGCONT 18
+#define SIGSTOP 19
+#define SIGTSTP 20
+#define SIGTTIN 21
+#define SIGTTOU 22
+#define SIGURG 23
+#define SIGXCPU 24
+#define SIGXFSZ 25
+#define SIGVTALRM 26
+#define SIGPROF 27
+#define SIGWINCH 28
+#define SIGIO 29
+#define SIGPOLL SIGIO
+
+#define SIGLOST 29
+
+#define SIGPWR 30
+#define SIGSYS 31
+#define SIGUNUSED 31
+
+#define SIG_BLOCK 0
+#define SIG_UNBLOCK 1
+#define SIG_SETMASK 2
+
+typedef void __signalfn_t(int);
+typedef __signalfn_t *__sighandler_t;
+
+#define SIG_DFL ((__sighandler_t)0)
+#define SIG_IGN ((__sighandler_t)1)
+#define SIG_ERR ((__sighandler_t) - 1)
+
+#endif // _BITS_SIGNAL_H