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commit de8995a2a04163617c1a233b4b81356ef9f9741f
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Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Date: Wed Mar 10 12:26:30 2021 -0300
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support: Add xclone
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It is a wrapper for Linux clone syscall, to simplify the call to the
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use only the most common arguments and remove architecture specific
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handling (such as ia64 different name and signature).
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# Conflicts:
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# support/Makefile
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diff --git a/support/Makefile b/support/Makefile
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index fb95a69ed9158e78..d2b95539403e416c 100644
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--- a/support/Makefile
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+++ b/support/Makefile
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@@ -84,6 +84,7 @@ libsupport-routines = \
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xcalloc \
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xchdir \
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xchroot \
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+ xclone \
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xclose \
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xconnect \
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xcopy_file_range \
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diff --git a/support/xclone.c b/support/xclone.c
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new file mode 100644
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index 0000000000000000..924d2b875402a819
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--- /dev/null
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+++ b/support/xclone.c
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@@ -0,0 +1,50 @@
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+/* Auxiliary functions to issue the clone syscall.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifdef __linux__
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+# include <support/check.h>
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+# include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */
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+# include <xsched.h>
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+
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+pid_t
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+xclone (int (*fn) (void *arg), void *arg, void *stack, size_t stack_size,
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+ int flags)
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+{
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+ pid_t r = -1;
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+
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+# ifdef __ia64__
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+ extern int __clone2 (int (*fn) (void *arg), void *stack, size_t stack_size,
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+ int flags, void *arg, ...);
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+ r = __clone2 (f, stack, stack_size, flags, arg, /* ptid */ NULL,
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+ /* tls */ NULL, /* ctid */ ctid);
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+# else
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+# if _STACK_GROWS_DOWN
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+ r = clone (fn, stack + stack_size, flags, arg, /* ptid */ NULL,
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+ /* tls */ NULL, /* ctid */ NULL);
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+# elif _STACK_GROWS_UP
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+ r = clone (fn, stack, flags, arg, /* ptid */ NULL, /* tls */ NULL,
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+ &ctid);
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+# endif
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+# endif
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+
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+ if (r < 0)
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+ FAIL_EXIT1 ("clone: %m");
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+
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+ return r;
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+}
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+#endif
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diff --git a/support/xsched.h b/support/xsched.h
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new file mode 100644
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index 0000000000000000..eefd731940187b39
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--- /dev/null
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+++ b/support/xsched.h
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@@ -0,0 +1,34 @@
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+/* Wrapper for sched.h functions.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#ifndef SUPPORT_XSCHED_H
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+#define SUPPORT_XSCHED_H
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+
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+__BEGIN_DECLS
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+
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+#include <sched.h>
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+#include <sys/types.h>
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+
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+#ifdef __linux__
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+pid_t xclone (int (*fn) (void *arg), void *arg, void *stack,
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+ size_t stack_size, int flags);
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+#endif
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+
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+__END_DECLS
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+
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+#endif
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