From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id 8D05F3857C56; Thu, 24 Jun 2021 20:53:40 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8D05F3857C56 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Adhemerval Zanella To: glibc-cvs@sourceware.org Subject: [glibc] support: Add xclone X-Act-Checkin: glibc X-Git-Author: Adhemerval Zanella X-Git-Refname: refs/heads/master X-Git-Oldrev: e3e3eb0a2ea615c272cec5f47ba9f243ccdaf386 X-Git-Newrev: de8995a2a04163617c1a233b4b81356ef9f9741f Message-Id: <20210624205340.8D05F3857C56@sourceware.org> Date: Thu, 24 Jun 2021 20:53:40 +0000 (GMT) X-BeenThere: glibc-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Glibc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Jun 2021 20:53:40 -0000 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=de8995a2a04163617c1a233b4b81356ef9f9741f commit de8995a2a04163617c1a233b4b81356ef9f9741f Author: Adhemerval Zanella Date: Wed Mar 10 12:26:30 2021 -0300 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). Diff: --- support/Makefile | 1 + support/xclone.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ support/xsched.h | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 85 insertions(+) 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 + . */ + +#ifdef __linux__ +# include +# include /* For _STACK_GROWS_{UP,DOWN}. */ +# include + +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 + . */ + +#ifndef SUPPORT_XSCHED_H +#define SUPPORT_XSCHED_H + +__BEGIN_DECLS + +#include +#include + +#ifdef __linux__ +pid_t xclone (int (*fn) (void *arg), void *arg, void *stack, + size_t stack_size, int flags); +#endif + +__END_DECLS + +#endif