diff options
Diffstat (limited to 'src/basic/missing_syscall.h')
| -rw-r--r-- | src/basic/missing_syscall.h | 648 |
1 files changed, 648 insertions, 0 deletions
diff --git a/src/basic/missing_syscall.h b/src/basic/missing_syscall.h new file mode 100644 index 0000000..d54e59f --- /dev/null +++ b/src/basic/missing_syscall.h @@ -0,0 +1,648 @@ +/* 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 "macro.h" +#include "missing_keyctl.h" +#include "missing_stat.h" +#include "missing_syscall_def.h" + +/* 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_IOPRIO_GET +static inline int missing_ioprio_get(int which, int who) { + return syscall(__NR_ioprio_get, which, who); +} + +# define ioprio_get missing_ioprio_get +#endif + +/* ======================================================================= */ + +#if !HAVE_IOPRIO_SET +static inline int missing_ioprio_set(int which, int who, int ioprio) { + return syscall(__NR_ioprio_set, which, who, ioprio); +} + +# define ioprio_set missing_ioprio_set +#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 +/* glibc says getrandom() returns ssize_t */ +static inline ssize_t 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 + +/* ======================================================================= */ + +#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 !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 + +/* ======================================================================= */ + +#if !HAVE_MOUNT_SETATTR + +#if !HAVE_STRUCT_MOUNT_ATTR +struct mount_attr { + uint64_t attr_set; + uint64_t attr_clr; + uint64_t propagation; + uint64_t userns_fd; +}; +#else +struct mount_attr; +#endif + +#ifndef MOUNT_ATTR_RDONLY +#define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */ +#endif + +#ifndef MOUNT_ATTR_NOSUID +#define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */ +#endif + +#ifndef MOUNT_ATTR_NODEV +#define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */ +#endif + +#ifndef MOUNT_ATTR_NOEXEC +#define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */ +#endif + +#ifndef MOUNT_ATTR__ATIME +#define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */ +#endif + +#ifndef MOUNT_ATTR_RELATIME +#define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */ +#endif + +#ifndef MOUNT_ATTR_NOATIME +#define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */ +#endif + +#ifndef MOUNT_ATTR_STRICTATIME +#define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */ +#endif + +#ifndef MOUNT_ATTR_NODIRATIME +#define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */ +#endif + +#ifndef MOUNT_ATTR_IDMAP +#define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */ +#endif + +#ifndef MOUNT_ATTR_NOSYMFOLLOW +#define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */ +#endif + +#ifndef MOUNT_ATTR_SIZE_VER0 +#define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */ +#endif + +#ifndef AT_RECURSIVE +#define AT_RECURSIVE 0x8000 +#endif + +static inline int missing_mount_setattr( + int dfd, + const char *path, + unsigned flags, + struct mount_attr *attr, + size_t size) { + +# if defined __NR_mount_setattr && __NR_mount_setattr >= 0 + return syscall(__NR_mount_setattr, dfd, path, flags, attr, size); +# else + errno = ENOSYS; + return -1; +# endif +} + +# define mount_setattr missing_mount_setattr +#endif + +/* ======================================================================= */ + +#if !HAVE_OPEN_TREE + +#ifndef OPEN_TREE_CLONE +#define OPEN_TREE_CLONE 1 +#endif + +#ifndef OPEN_TREE_CLOEXEC +#define OPEN_TREE_CLOEXEC O_CLOEXEC +#endif + +static inline int missing_open_tree( + int dfd, + const char *filename, + unsigned flags) { + +# if defined __NR_open_tree && __NR_open_tree >= 0 + return syscall(__NR_open_tree, dfd, filename, flags); +# else + errno = ENOSYS; + return -1; +# endif +} + +# define open_tree missing_open_tree +#endif + +/* ======================================================================= */ + +#if !HAVE_MOVE_MOUNT + +#ifndef MOVE_MOUNT_F_EMPTY_PATH +#define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */ +#endif + +#ifndef MOVE_MOUNT_T_EMPTY_PATH +#define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */ +#endif + +static inline int missing_move_mount( + int from_dfd, + const char *from_pathname, + int to_dfd, + const char *to_pathname, + unsigned flags) { + +# if defined __NR_move_mount && __NR_move_mount >= 0 + return syscall(__NR_move_mount, from_dfd, from_pathname, to_dfd, to_pathname, flags); +# else + errno = ENOSYS; + return -1; +# endif +} + +# define move_mount missing_move_mount +#endif + +/* ======================================================================= */ + +#if !HAVE_FSOPEN + +#ifndef FSOPEN_CLOEXEC +#define FSOPEN_CLOEXEC 0x00000001 +#endif + +static inline int missing_fsopen(const char *fsname, unsigned flags) { +# if defined __NR_fsopen && __NR_fsopen >= 0 + return syscall(__NR_fsopen, fsname, flags); +# else + errno = ENOSYS; + return -1; +# endif +} + +# define fsopen missing_fsopen +#endif + +/* ======================================================================= */ + +#if !HAVE_FSCONFIG + +#ifndef FSCONFIG_SET_STRING +#define FSCONFIG_SET_STRING 1 /* Set parameter, supplying a string value */ +#endif + +static inline int missing_fsconfig(int fd, unsigned cmd, const char *key, const void *value, int aux) { +# if defined __NR_fsconfig && __NR_fsconfig >= 0 + return syscall(__NR_fsconfig, fd, cmd, key, value, aux); +# else + errno = ENOSYS; + return -1; +# endif +} + +# define fsconfig missing_fsconfig +#endif + +/* ======================================================================= */ + +#if !HAVE_GETDENTS64 + +static inline ssize_t missing_getdents64(int fd, void *buffer, size_t length) { +# if defined __NR_getdents64 && __NR_getdents64 >= 0 + return syscall(__NR_getdents64, fd, buffer, length); +# else + errno = ENOSYS; + return -1; +# endif +} + +# define getdents64 missing_getdents64 +#endif |