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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2021-03-10 12:26:30 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2021-06-24 10:00:52 -0300
commitde8995a2a04163617c1a233b4b81356ef9f9741f (patch)
treecf7b222d36481bea05cb074db33be67decc28b70
parente3e3eb0a2ea615c272cec5f47ba9f243ccdaf386 (diff)
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support: Add xclone
It is a wrapper for Linux clone syscall, to simplify the call to the
use only the most common arguments and remove architecture specific
handling (such as ia64 different name and signature).
-rw-r--r--support/Makefile1
-rw-r--r--support/xclone.c50
-rw-r--r--support/xsched.h34
3 files changed, 85 insertions, 0 deletions
diff --git a/support/Makefile b/support/Makefile
index 278f4627d8..5c69f0de4b 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -103,6 +103,7 @@ libsupport-routines = \
   xclock_gettime_time64 \
   xclock_settime \
   xclock_settime_time64 \
+  xclone \
   xclose \
   xchmod \
   xconnect \
diff --git a/support/xclone.c b/support/xclone.c
new file mode 100644
index 0000000000..924d2b8754
--- /dev/null
+++ b/support/xclone.c
@@ -0,0 +1,50 @@
+/* Auxiliary functions to issue the clone syscall.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifdef __linux__
+# include <support/check.h>
+# include <stackinfo.h>  /* For _STACK_GROWS_{UP,DOWN}.  */
+# include <xsched.h>
+
+pid_t
+xclone (int (*fn) (void *arg), void *arg, void *stack, size_t stack_size,
+	int flags)
+{
+  pid_t r = -1;
+
+# ifdef __ia64__
+  extern int __clone2 (int (*fn) (void *arg), void *stack, size_t stack_size,
+		       int flags, void *arg, ...);
+  r = __clone2 (f, stack, stack_size, flags, arg, /* ptid */ NULL,
+		/* tls */ NULL, /* ctid  */ ctid);
+# else
+#  if _STACK_GROWS_DOWN
+  r = clone (fn, stack + stack_size, flags, arg, /* ptid */ NULL,
+	     /* tls */ NULL, /* ctid */  NULL);
+#  elif _STACK_GROWS_UP
+  r = clone (fn, stack, flags, arg, /* ptid */ NULL, /* tls */ NULL,
+	     &ctid);
+#  endif
+# endif
+
+  if (r < 0)
+    FAIL_EXIT1 ("clone: %m");
+
+  return r;
+}
+#endif
diff --git a/support/xsched.h b/support/xsched.h
new file mode 100644
index 0000000000..eefd731940
--- /dev/null
+++ b/support/xsched.h
@@ -0,0 +1,34 @@
+/* Wrapper for sched.h functions.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef SUPPORT_XSCHED_H
+#define SUPPORT_XSCHED_H
+
+__BEGIN_DECLS
+
+#include <sched.h>
+#include <sys/types.h>
+
+#ifdef __linux__
+pid_t xclone (int (*fn) (void *arg), void *arg, void *stack,
+	      size_t stack_size, int flags);
+#endif
+
+__END_DECLS
+
+#endif