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Systemd/src/basic/missing_syscall.h
Michael Karcher 8869a0b40b util-lib: Add sparc64 support for process creation (#3348) 
The current raw_clone function takes two arguments, the cloning flags and
a pointer to the stack for the cloned child. The raw cloning without
passing a "thread main" function does not make sense if a new stack is
specified, as it returns in both the parent and the child, which will fail
in the child as the stack is virgin. All uses of raw_clone indeed pass NULL
for the stack pointer which indicates that both processes should share the
stack address (so you better don't pass CLONE_VM).

This commit refactors the code to not require the caller to pass the stack
address, as NULL is the only sensible option. It also adds the magic code
needed to make raw_clone work on sparc64, which does not return 0 in %o0
for the child, but indicates the child process by setting %o1 to non-zero.
This refactoring is not plain aesthetic, because non-NULL stack addresses
need to get mangled before being passed to the clone syscall (you have to
apply STACK_BIAS), whereas NULL must not be mangled. Implementing the
conditional mangling of the stack address would needlessly complicate the
code.

raw_clone is moved to a separete header, because the burden of including
the assert machinery and sched.h shouldn't be applied to every user of
missing_syscalls.h
2016-05-29 20:03:51 -04:00

299 lines
8.3 KiB
C
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#pragma once
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
Copyright 2016 Zbigniew Jędrzejewski-Szmek
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
/* Missing glibc definitions to access certain kernel APIs */
#if !HAVE_DECL_PIVOT_ROOT
static inline int pivot_root(const char *new_root, const char *put_old) {
return syscall(SYS_pivot_root, new_root, put_old);
}
#endif
/* ======================================================================= */
#if !HAVE_DECL_MEMFD_CREATE
# ifndef __NR_memfd_create
# if defined __x86_64__
# define __NR_memfd_create 319
# elif defined __arm__
# define __NR_memfd_create 385
# elif defined __aarch64__
# define __NR_memfd_create 279
# elif defined __s390__
# define __NR_memfd_create 350
# elif defined _MIPS_SIM
# if _MIPS_SIM == _MIPS_SIM_ABI32
# define __NR_memfd_create 4354
# endif
# if _MIPS_SIM == _MIPS_SIM_NABI32
# define __NR_memfd_create 6318
# endif
# if _MIPS_SIM == _MIPS_SIM_ABI64
# define __NR_memfd_create 5314
# endif
# elif defined __i386__
# define __NR_memfd_create 356
# else
# warning "__NR_memfd_create unknown for your architecture"
# endif
# endif
static inline int memfd_create(const char *name, unsigned int flags) {
# ifdef __NR_memfd_create
return syscall(__NR_memfd_create, name, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
/* ======================================================================= */
#if !HAVE_DECL_GETRANDOM
# ifndef __NR_getrandom
# if defined __x86_64__
# define __NR_getrandom 318
# elif defined(__i386__)
# define __NR_getrandom 355
# elif defined(__arm__)
# define __NR_getrandom 384
# elif defined(__aarch64__)
# define __NR_getrandom 278
# elif defined(__ia64__)
# define __NR_getrandom 1339
# elif defined(__m68k__)
# define __NR_getrandom 352
# elif defined(__s390x__)
# define __NR_getrandom 349
# elif defined(__powerpc__)
# define __NR_getrandom 359
# elif defined _MIPS_SIM
# if _MIPS_SIM == _MIPS_SIM_ABI32
# define __NR_getrandom 4353
# endif
# if _MIPS_SIM == _MIPS_SIM_NABI32
# define __NR_getrandom 6317
# endif
# if _MIPS_SIM == _MIPS_SIM_ABI64
# define __NR_getrandom 5313
# endif
# else
# warning "__NR_getrandom unknown for your architecture"
# endif
# endif
static inline int getrandom(void *buffer, size_t count, unsigned flags) {
# ifdef __NR_getrandom
return syscall(__NR_getrandom, buffer, count, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
/* ======================================================================= */
#if !HAVE_DECL_GETTID
static inline pid_t gettid(void) {
return (pid_t) syscall(SYS_gettid);
}
#endif
/* ======================================================================= */
#if !HAVE_DECL_NAME_TO_HANDLE_AT
# ifndef __NR_name_to_handle_at
# if defined(__x86_64__)
# define __NR_name_to_handle_at 303
# elif defined(__i386__)
# define __NR_name_to_handle_at 341
# elif defined(__arm__)
# define __NR_name_to_handle_at 370
# elif defined(__powerpc__)
# define __NR_name_to_handle_at 345
# else
# error "__NR_name_to_handle_at is not defined"
# endif
# endif
struct file_handle {
unsigned int handle_bytes;
int handle_type;
unsigned char f_handle[0];
};
static inline int name_to_handle_at(int fd, const char *name, struct file_handle *handle, int *mnt_id, int flags) {
# ifdef __NR_name_to_handle_at
return syscall(__NR_name_to_handle_at, fd, name, handle, mnt_id, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
/* ======================================================================= */
#if !HAVE_DECL_SETNS
# ifndef __NR_setns
# if defined(__x86_64__)
# define __NR_setns 308
# elif defined(__i386__)
# define __NR_setns 346
# else
# error "__NR_setns is not defined"
# endif
# endif
static inline int setns(int fd, int nstype) {
# ifdef __NR_setns
return syscall(__NR_setns, fd, nstype);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
/* ======================================================================= */
static inline pid_t raw_getpid(void) {
#if defined(__alpha__)
return (pid_t) syscall(__NR_getxpid);
#else
return (pid_t) syscall(__NR_getpid);
#endif
}
/* ======================================================================= */
#if !HAVE_DECL_RENAMEAT2
# ifndef __NR_renameat2
# if defined __x86_64__
# define __NR_renameat2 316
# elif defined __arm__
# define __NR_renameat2 382
# elif defined _MIPS_SIM
# if _MIPS_SIM == _MIPS_SIM_ABI32
# define __NR_renameat2 4351
# endif
# if _MIPS_SIM == _MIPS_SIM_NABI32
# define __NR_renameat2 6315
# endif
# if _MIPS_SIM == _MIPS_SIM_ABI64
# define __NR_renameat2 5311
# endif
# elif defined __i386__
# define __NR_renameat2 353
# else
# warning "__NR_renameat2 unknown for your architecture"
# endif
# endif
static inline int renameat2(int oldfd, const char *oldname, int newfd, const char *newname, unsigned flags) {
# ifdef __NR_renameat2
return syscall(__NR_renameat2, oldfd, oldname, newfd, newname, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
/* ======================================================================= */
#if !HAVE_DECL_KCMP
static inline int kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
# ifdef __NR_kcmp
return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
/* ======================================================================= */
#if !HAVE_DECL_KEYCTL
static inline long keyctl(int cmd, unsigned long arg2, unsigned long arg3, unsigned long arg4,unsigned long arg5) {
# ifdef __NR_keyctl
return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
# else
errno = ENOSYS;
return -1;
# endif
}
static inline key_serial_t add_key(const char *type, const char *description, const void *payload, size_t plen, key_serial_t ringid) {
# ifdef __NR_add_key
return syscall(__NR_add_key, type, description, payload, plen, ringid);
# else
errno = ENOSYS;
return -1;
# endif
}
static inline key_serial_t request_key(const char *type, const char *description, const char * callout_info, key_serial_t destringid) {
# ifdef __NR_request_key
return syscall(__NR_request_key, type, description, callout_info, destringid);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
/* ======================================================================= */
#if !HAVE_DECL_COPY_FILE_RANGE
# ifndef __NR_copy_file_range
# if defined(__x86_64__)
# define __NR_copy_file_range 326
# elif defined(__i386__)
# define __NR_copy_file_range 377
# elif defined __s390__
# define __NR_copy_file_range 375
# elif defined __arm__
# define __NR_copy_file_range 391
# elif defined __aarch64__
# define __NR_copy_file_range 285
# else
# warning "__NR_copy_file_range not defined for your architecture"
# endif
# endif
static inline ssize_t copy_file_range(int fd_in, loff_t *off_in,
int fd_out, loff_t *off_out,
size_t len,
unsigned int flags) {
# ifdef __NR_copy_file_range
return syscall(__NR_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
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