/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
/* Missing glibc definitions to access certain kernel APIs */
#include <errno.h>
#include <fcntl.h>
#if HAVE_LINUX_TIME_TYPES_H
/* This header defines __kernel_timespec for us, but is only available since Linux 5.1, hence conditionally
* include this. */
#include <linux/time_types.h>
#endif
#include <signal.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#ifdef ARCH_MIPS
#include <asm/sgidefs.h>
#endif
#include "missing_keyctl.h"
#include "missing_stat.h"
#include "missing_syscall_def.h"
#if 0 /* NM_IGNORED */
/* linux/kcmp.h */
#ifndef KCMP_FILE /* 3f4994cfc15f38a3159c6e3a4b3ab2e1481a6b02 (3.19) */
#define KCMP_FILE 0
#endif
/* ======================================================================= */
#if !HAVE_PIVOT_ROOT
static inline int missing_pivot_root(const char *new_root, const char *put_old) {
return syscall(__NR_pivot_root, new_root, put_old);
}
# define pivot_root missing_pivot_root
#endif
/* ======================================================================= */
#if !HAVE_MEMFD_CREATE
static inline int missing_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
}
# define memfd_create missing_memfd_create
#endif
/* ======================================================================= */
#if !HAVE_GETRANDOM
static inline int missing_getrandom(void *buffer, size_t count, unsigned flags) {
# ifdef __NR_getrandom
return syscall(__NR_getrandom, buffer, count, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
# define getrandom missing_getrandom
#endif
/* ======================================================================= */
/* The syscall has been defined since forever, but the glibc wrapper was missing. */
#if !HAVE_GETTID
static inline pid_t missing_gettid(void) {
# if defined __NR_gettid && __NR_gettid >= 0
return (pid_t) syscall(__NR_gettid);
# else
# error "__NR_gettid not defined"
# endif
}
# define gettid missing_gettid
#endif
/* ======================================================================= */
#if !HAVE_NAME_TO_HANDLE_AT
struct file_handle {
unsigned int handle_bytes;
int handle_type;
unsigned char f_handle[0];
};
static inline int missing_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
}
# define name_to_handle_at missing_name_to_handle_at
#endif
/* ======================================================================= */
#if !HAVE_SETNS
static inline int missing_setns(int fd, int nstype) {
# ifdef __NR_setns
return syscall(__NR_setns, fd, nstype);
# else
errno = ENOSYS;
return -1;
# endif
}
# define setns missing_setns
#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_RENAMEAT2
static inline int missing_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
}
# define renameat2 missing_renameat2
#endif
/* ======================================================================= */
#if !HAVE_KCMP
static inline int missing_kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
# if defined __NR_kcmp && __NR_kcmp >= 0
return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
# else
errno = ENOSYS;
return -1;
# endif
}
# define kcmp missing_kcmp
#endif
/* ======================================================================= */
#if !HAVE_KEYCTL
static inline long missing_keyctl(int cmd, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5) {
# if defined __NR_keyctl && __NR_keyctl >= 0
return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
# else
errno = ENOSYS;
return -1;
# endif
# define keyctl missing_keyctl
}
static inline key_serial_t missing_add_key(const char *type, const char *description, const void *payload, size_t plen, key_serial_t ringid) {
# if defined __NR_add_key && __NR_add_key >= 0
return syscall(__NR_add_key, type, description, payload, plen, ringid);
# else
errno = ENOSYS;
return -1;
# endif
# define add_key missing_add_key
}
static inline key_serial_t missing_request_key(const char *type, const char *description, const char * callout_info, key_serial_t destringid) {
# if defined __NR_request_key && __NR_request_key >= 0
return syscall(__NR_request_key, type, description, callout_info, destringid);
# else
errno = ENOSYS;
return -1;
# endif
# define request_key missing_request_key
}
#endif
/* ======================================================================= */
#if !HAVE_COPY_FILE_RANGE
static inline ssize_t missing_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
}
# define copy_file_range missing_copy_file_range
#endif
/* ======================================================================= */
#if !HAVE_BPF
union bpf_attr;
static inline int missing_bpf(int cmd, union bpf_attr *attr, size_t size) {
#ifdef __NR_bpf
return (int) syscall(__NR_bpf, cmd, attr, size);
#else
errno = ENOSYS;
return -1;
#endif
}
# define bpf missing_bpf
#endif
/* ======================================================================= */
#if !HAVE_STATX
struct statx;
static inline ssize_t missing_statx(int dfd, const char *filename, unsigned flags, unsigned int mask, struct statx *buffer) {
# ifdef __NR_statx
return syscall(__NR_statx, dfd, filename, flags, mask, buffer);
# else
errno = ENOSYS;
return -1;
# endif
}
#endif
/* This typedef is supposed to be always defined. */
typedef struct statx struct_statx;
#if !HAVE_STATX
# define statx(dfd, filename, flags, mask, buffer) missing_statx(dfd, filename, flags, mask, buffer)
#endif
/* ======================================================================= */
#if !HAVE_SET_MEMPOLICY
enum {
MPOL_DEFAULT,
MPOL_PREFERRED,
MPOL_BIND,
MPOL_INTERLEAVE,
MPOL_LOCAL,
};
static inline long missing_set_mempolicy(int mode, const unsigned long *nodemask,
unsigned long maxnode) {
long i;
# if defined __NR_set_mempolicy && __NR_set_mempolicy >= 0
i = syscall(__NR_set_mempolicy, mode, nodemask, maxnode);
# else
errno = ENOSYS;
i = -1;
# endif
return i;
}
# define set_mempolicy missing_set_mempolicy
#endif
#if !HAVE_GET_MEMPOLICY
static inline long missing_get_mempolicy(int *mode, unsigned long *nodemask,
unsigned long maxnode, void *addr,
unsigned long flags) {
long i;
# if defined __NR_get_mempolicy && __NR_get_mempolicy >= 0
i = syscall(__NR_get_mempolicy, mode, nodemask, maxnode, addr, flags);
# else
errno = ENOSYS;
i = -1;
# endif
return i;
}
# define get_mempolicy missing_get_mempolicy
#endif
#endif /* NM_IGNORED */
/* ======================================================================= */
#if !HAVE_PIDFD_SEND_SIGNAL
static inline int missing_pidfd_send_signal(int fd, int sig, siginfo_t *info, unsigned flags) {
# ifdef __NR_pidfd_send_signal
return syscall(__NR_pidfd_send_signal, fd, sig, info, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
# define pidfd_send_signal missing_pidfd_send_signal
#endif
#if !HAVE_PIDFD_OPEN
static inline int missing_pidfd_open(pid_t pid, unsigned flags) {
# ifdef __NR_pidfd_open
return syscall(__NR_pidfd_open, pid, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
# define pidfd_open missing_pidfd_open
#endif
/* ======================================================================= */
#if !HAVE_RT_SIGQUEUEINFO
static inline int missing_rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *info) {
# if defined __NR_rt_sigqueueinfo && __NR_rt_sigqueueinfo >= 0
return syscall(__NR_rt_sigqueueinfo, tgid, sig, info);
# else
# error "__NR_rt_sigqueueinfo not defined"
# endif
}
# define rt_sigqueueinfo missing_rt_sigqueueinfo
#endif
/* ======================================================================= */
#if 0 /* NM_IGNORED */
#if !HAVE_EXECVEAT
static inline int missing_execveat(int dirfd, const char *pathname,
char *const argv[], char *const envp[],
int flags) {
# if defined __NR_execveat && __NR_execveat >= 0
return syscall(__NR_execveat, dirfd, pathname, argv, envp, flags);
# else
errno = ENOSYS;
return -1;
# endif
}
# undef AT_EMPTY_PATH
# define AT_EMPTY_PATH 0x1000
# define execveat missing_execveat
#endif
/* ======================================================================= */
#if !HAVE_CLOSE_RANGE
static inline int missing_close_range(int first_fd, int end_fd, unsigned flags) {
# ifdef __NR_close_range
/* Kernel-side the syscall expects fds as unsigned integers (just like close() actually), while
* userspace exclusively uses signed integers for fds. We don't know just yet how glibc is going to
* wrap this syscall, but let's assume it's going to be similar to what they do for close(),
* i.e. make the same unsigned → signed type change from the raw kernel syscall compared to the
* userspace wrapper. There's only one caveat for this: unlike for close() there's the special
* UINT_MAX fd value for the 'end_fd' argument. Let's safely map that to -1 here. And let's refuse
* any other negative values. */
if ((first_fd < 0) || (end_fd < 0 && end_fd != -1)) {
errno = -EBADF;
return -1;
}
return syscall(__NR_close_range,
(unsigned) first_fd,
end_fd == -1 ? UINT_MAX : (unsigned) end_fd, /* Of course, the compiler should figure out that this is the identity mapping IRL */
flags);
# else
errno = ENOSYS;
return -1;
# endif
}
# define close_range missing_close_range
#endif
/* ======================================================================= */
#if !HAVE_EPOLL_PWAIT2
/* Defined to be equivalent to the kernel's _NSIG_WORDS, i.e. the size of the array of longs that is
* encapsulated by sigset_t. */
#define KERNEL_NSIG_WORDS (64 / (sizeof(long) * 8))
#define KERNEL_NSIG_BYTES (KERNEL_NSIG_WORDS * sizeof(long))
struct epoll_event;
static inline int missing_epoll_pwait2(
int fd,
struct epoll_event *events,
int maxevents,
const struct timespec *timeout,
const sigset_t *sigset) {
# if defined(__NR_epoll_pwait2) && HAVE_LINUX_TIME_TYPES_H
if (timeout) {
/* Convert from userspace timespec to kernel timespec */
struct __kernel_timespec ts = {
.tv_sec = timeout->tv_sec,
.tv_nsec = timeout->tv_nsec,
};
return syscall(__NR_epoll_pwait2, fd, events, maxevents, &ts, sigset, sigset ? KERNEL_NSIG_BYTES : 0);
} else
return syscall(__NR_epoll_pwait2, fd, events, maxevents, NULL, sigset, sigset ? KERNEL_NSIG_BYTES : 0);
# else
errno = ENOSYS;
return -1;
# endif
}
# define epoll_pwait2 missing_epoll_pwait2
#endif
#endif /* NM_IGNORED */