04e6fdad13
* include/linux/riscv32/kernel-stat.h, include/linux/riscv64/kernel-stat.h: New files. * include/fcntl.h (AT_FDCWD, AT_SYMLINK_NOFOLLOW, AT_REMOVEDIR): Add necessary constants. * include/stdint.h: Integer size defines for RISC-V. * include/sys/stat.h: "stat" struct for RISC-V. * lib/linux/_open3.c (_open3)[!SYS_open]: Use SYS_openat. * lib/linux/access.c (access)[!SYS_access]: Use SYS_faccessat. * lib/linux/chmod.c (chmod)[!SYS_chmod]: Use SYS_fchmodat. * lib/linux/dup2.c (dup2)[!SYS_dup2]: Use if SYS_dup3. * lib/linux/fork.c (fork)[!SYS_fork]: Use SYS_clone. * lib/linux/getdents.c (getdents)[!SYS_getdents]: Use SYS_getdents64. * lib/linux/link.c (link)[!SYS_link]: Use SYS_linkat. * lib/linux/lstat.c (lstat)[!SYS_lstat]: Use SYS_newfstatat. * lib/linux/mkdir.c (mkdir)[!SYS_mkdir]: Use SYS_mkdirat. * lib/linux/mknod.c (mknod)[!SYS_mknod]: Use SYS_mknodat. * lib/linux/pipe.c (pipe)[!SYS_pipe]: Use SYS_pipe2. * lib/linux/readlink.c (readlink)[!SYS_readlinkat]: Use SYS_readlinkat. * lib/linux/rename.c (rename)[!SYS_rename]: Use SYS_renameat2. * lib/linux/rmdir.c (rmdir)[!SYS_rmdir]: Use SYS_unlinkat. * lib/linux/signal.c (_restorer_for_siginfo): Remove unused function that causes compilation issue. * lib/linux/stat.c (stat)[!SYS_stat]: Use SYS_newfstatat. * lib/linux/symlink.c (symlink)[!SYS_symlinkat]: Use SYS_symlink. * lib/linux/unlink.c (unlink)[!SYS_unlink]: Use SYS_unlinkat.
74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2018,2019,2022,2023 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/syscall.h>
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#include <arch/syscall.h>
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#include <unistd.h>
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#include <signal.h>
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#if defined (SYS_rt_sigreturn)
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void
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_restorer_for_siginfo (void)
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{
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_sys_call (SYS_rt_sigreturn);
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}
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#endif
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sighandler_t
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signal (int signum, sighandler_t action)
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{
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#if __i386__
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return _sys_call2 (SYS_signal, signum, (long) action);
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#elif defined (SYS_rt_sigaction)
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static struct sigaction setup_action = { 0 };
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static struct sigaction old = { 0 };
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unsigned short bitindex;
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unsigned short itembitcount;
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setup_action.sa_handler = action;
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/* The sa_restorer is not used. Reason:
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* The kernel uses its own restorer anyway by pretending we gave one on
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our side (no, really).
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glibc still has a custom restorer because they want to be able to
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backtrace. gdb has a second part that detects a specific instruction
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sequence and then fixes up the backtrace. Since we don't use that
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specific instruction sequence and also the non-siginfo restorer
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is complicated (pops foreign item off the stack--so needs inline
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assembly) and we don't support great debuggability in other places,
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I've decided to take the easy way out for now. */
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/*setup_action.sa_restorer = _restorer_for_siginfo;*/
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bitindex = signum - 1;
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itembitcount = 8 * sizeof (setup_action.sa_mask.items[0]);
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setup_action.sa_mask.items[bitindex / itembitcount] = 1UL << (bitindex % itembitcount);
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old.sa_handler = SIG_DFL;
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setup_action.sa_flags = SA_RESTART;
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#if __x86_64__
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/* Tell kernel that we use a restorer, on penalty of segfault. */
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setup_action.sa_flags |= SA_RESTORER;
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#endif
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int r = _sys_call4 (SYS_rt_sigaction, signum, (long) &setup_action, (long) &old, sizeof (sigset_t));
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if (r)
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return 0;
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return old.sa_handler;
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#else
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#error no signal
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#endif
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}
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