src/basic/missing_syscall.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 /* Missing glibc definitions to access certain kernel APIs */
   5
   6 #include <linux/mempolicy.h>
   7 #include <signal.h>
   8 #include <sys/syscall.h>
   9 #include <sys/xattr.h>
  10 #include <unistd.h>
  11
  12 #ifdef ARCH_MIPS
  13 #include <asm/sgidefs.h>
  14 #endif
  15
  16 #include "forward.h"
  17 #include "missing_keyctl.h"
  18 #include "missing_sched.h"
  19 #include "missing_syscall_def.h"
  20
  21 /* ======================================================================= */
  22
  23 #if !HAVE_FCHMODAT2
  24 /* since kernel v6.6 (78252deb023cf0879256fcfbafe37022c390762b) */
  25 static inline int missing_fchmodat2(int dirfd, const char *path, mode_t mode, int flags) {
  26         return syscall(__NR_fchmodat2, dirfd, path, mode, flags);
  27 }
  28
  29 #  define fchmodat2 missing_fchmodat2
  30 #endif
  31
  32 /* ======================================================================= */
  33
  34 #if !HAVE_PIVOT_ROOT
  35 static inline int missing_pivot_root(const char *new_root, const char *put_old) {
  36         return syscall(__NR_pivot_root, new_root, put_old);
  37 }
  38
  39 #  define pivot_root missing_pivot_root
  40 #endif
  41
  42 /* ======================================================================= */
  43
  44 #if !HAVE_IOPRIO_GET
  45 static inline int missing_ioprio_get(int which, int who) {
  46         return syscall(__NR_ioprio_get, which, who);
  47 }
  48
  49 #  define ioprio_get missing_ioprio_get
  50 #endif
  51
  52 /* ======================================================================= */
  53
  54 #if !HAVE_IOPRIO_SET
  55 static inline int missing_ioprio_set(int which, int who, int ioprio) {
  56         return syscall(__NR_ioprio_set, which, who, ioprio);
  57 }
  58
  59 #  define ioprio_set missing_ioprio_set
  60 #endif
  61
  62 /* ======================================================================= */
  63
  64 #if !HAVE_KCMP
  65 static inline int missing_kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
  66         return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
  67 }
  68
  69 #  define kcmp missing_kcmp
  70 #endif
  71
  72 /* ======================================================================= */
  73
  74 #if !HAVE_KEYCTL
  75 static inline long missing_keyctl(int cmd, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5) {
  76         return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);
  77
  78 #  define keyctl missing_keyctl
  79 }
  80
  81 /* ======================================================================= */
  82
  83 static inline key_serial_t missing_add_key(const char *type, const char *description, const void *payload, size_t plen, key_serial_t ringid) {
  84         return syscall(__NR_add_key, type, description, payload, plen, ringid);
  85
  86 #  define add_key missing_add_key
  87 }
  88
  89 /* ======================================================================= */
  90
  91 static inline key_serial_t missing_request_key(const char *type, const char *description, const char * callout_info, key_serial_t destringid) {
  92         return syscall(__NR_request_key, type, description, callout_info, destringid);
  93
  94 #  define request_key missing_request_key
  95 }
  96 #endif
  97
  98 /* ======================================================================= */
  99
 100 #if !HAVE_BPF
 101 union bpf_attr;
 102
 103 static inline int missing_bpf(int cmd, union bpf_attr *attr, size_t size) {
 104         return (int) syscall(__NR_bpf, cmd, attr, size);
 105 }
 106
 107 #  define bpf missing_bpf
 108 #endif
 109
 110 /* ======================================================================= */
 111
 112 #if !HAVE_SET_MEMPOLICY
 113 static inline long missing_set_mempolicy(int mode, const unsigned long *nodemask,
 114                            unsigned long maxnode) {
 115         return syscall(__NR_set_mempolicy, mode, nodemask, maxnode);
 116 }
 117
 118 #  define set_mempolicy missing_set_mempolicy
 119 #endif
 120
 121 #if !HAVE_GET_MEMPOLICY
 122 static inline long missing_get_mempolicy(int *mode, unsigned long *nodemask,
 123                            unsigned long maxnode, void *addr,
 124                            unsigned long flags) {
 125         return syscall(__NR_get_mempolicy, mode, nodemask, maxnode, addr, flags);
 126 }
 127
 128 #  define get_mempolicy missing_get_mempolicy
 129 #endif
 130
 131 /* ======================================================================= */
 132
 133 #if !HAVE_PIDFD_SEND_SIGNAL
 134 /* since kernel v5.1 (3eb39f47934f9d5a3027fe00d906a45fe3a15fad) */
 135 static inline int missing_pidfd_send_signal(int fd, int sig, siginfo_t *info, unsigned flags) {
 136         return syscall(__NR_pidfd_send_signal, fd, sig, info, flags);
 137 }
 138
 139 #  define pidfd_send_signal missing_pidfd_send_signal
 140 #endif
 141
 142 /* ======================================================================= */
 143
 144 #if !HAVE_PIDFD_OPEN
 145 /* since kernel v5.3 (7615d9e1780e26e0178c93c55b73309a5dc093d7) */
 146 static inline int missing_pidfd_open(pid_t pid, unsigned flags) {
 147         return syscall(__NR_pidfd_open, pid, flags);
 148 }
 149
 150 #  define pidfd_open missing_pidfd_open
 151 #endif
 152
 153 /* ======================================================================= */
 154
 155 #if !HAVE_RT_TGSIGQUEUEINFO
 156 static inline int missing_rt_tgsigqueueinfo(pid_t tgid, pid_t tid, int sig, siginfo_t *info) {
 157         return syscall(__NR_rt_tgsigqueueinfo, tgid, tid, sig, info);
 158 }
 159
 160 #  define rt_tgsigqueueinfo missing_rt_tgsigqueueinfo
 161 #endif
 162
 163 /* ======================================================================= */
 164
 165 #if !HAVE_EXECVEAT
 166 /* since kernel v3.19 (51f39a1f0cea1cacf8c787f652f26dfee9611874) */
 167 static inline int missing_execveat(int dirfd, const char *pathname,
 168                                    char *const argv[], char *const envp[],
 169                                    int flags) {
 170         return syscall(__NR_execveat, dirfd, pathname, argv, envp, flags);
 171 }
 172
 173 #  define execveat missing_execveat
 174 #endif
 175
 176 /* ======================================================================= */
 177
 178 #if !HAVE_CLOSE_RANGE
 179 /* since kernel v5.9 (9b4feb630e8e9801603f3cab3a36369e3c1cf88d) */
 180 static inline int missing_close_range(unsigned first_fd, unsigned end_fd, unsigned flags) {
 181         /* Kernel-side the syscall expects fds as unsigned integers (just like close() actually), while
 182          * userspace exclusively uses signed integers for fds. glibc chose to expose it 1:1 however, hence we
 183          * do so here too, even if we end up passing signed fds to it most of the time. */
 184         return syscall(__NR_close_range,
 185                        first_fd,
 186                        end_fd,
 187                        flags);
 188 }
 189
 190 #  define close_range missing_close_range
 191 #endif
 192
 193 /* ======================================================================= */
 194
 195 #if !HAVE_SCHED_SETATTR
 196 /* since kernel 3.14 (e6cfc0295c7d51b008999a8b13a44fb43f8685ea) */
 197 static inline ssize_t missing_sched_setattr(pid_t pid, struct sched_attr *attr, unsigned int flags) {
 198         return syscall(__NR_sched_setattr, pid, attr, flags);
 199 }
 200
 201 #  define sched_setattr missing_sched_setattr
 202 #endif
 203
 204 /* ======================================================================= */
 205
 206 /* glibc does not provide clone() on ia64, only clone2(). Not only that, but it also doesn't provide a
 207  * prototype, only the symbol in the shared library (it provides a prototype for clone(), but not the
 208  * symbol in the shared library). */
 209 #if defined(__ia64__)
 210 int __clone2(int (*fn)(void *), void *stack_base, size_t stack_size, int flags, void *arg);
 211 #define HAVE_CLONE 0
 212 #else
 213 /* We know that everywhere else clone() is available, so we don't bother with a meson check (that takes time
 214  * at build time) and just define it. Once the kernel drops ia64 support, we can drop this too. */
 215 #define HAVE_CLONE 1
 216 #endif
 217
 218 /* ======================================================================= */
 219
 220 #if !HAVE_QUOTACTL_FD
 221 /* since kernel v5.14 (64c2c2c62f92339b176ea24403d8db16db36f9e6) */
 222 static inline int missing_quotactl_fd(int fd, int cmd, int id, void *addr) {
 223         return syscall(__NR_quotactl_fd, fd, cmd, id, addr);
 224 }
 225
 226 #  define quotactl_fd missing_quotactl_fd
 227 #endif
 228
 229 /* ======================================================================= */
 230
 231 #if !HAVE_SETXATTRAT
 232 /* since kernel v6.13 (6140be90ec70c39fa844741ca3cc807dd0866394) */
 233 static inline int missing_setxattrat(int fd, const char *path, int at_flags, const char *name, const struct xattr_args *args, size_t size) {
 234         return syscall(__NR_setxattrat, fd, path, at_flags, name, args, size);
 235 }
 236
 237 #  define setxattrat missing_setxattrat
 238 #endif
 239
 240 /* ======================================================================= */
 241
 242 #if !HAVE_REMOVEXATTRAT
 243 /* since kernel v6.13 (6140be90ec70c39fa844741ca3cc807dd0866394) */
 244 static inline int missing_removexattrat(int fd, const char *path, int at_flags, const char *name) {
 245         return syscall(__NR_removexattrat, fd, path, at_flags, name);
 246 }
 247
 248 #  define removexattrat missing_removexattrat
 249 #endif