[thirdparty/systemd.git] / src / basic / missing_syscall.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

/* Missing glibc definitions to access certain kernel APIs */

#include <linux/mempolicy.h>
#include <signal.h>
#include <sys/syscall.h>
#include <sys/xattr.h>
#include <unistd.h>

#ifdef ARCH_MIPS
#include <asm/sgidefs.h>
#endif

#include "forward.h"
#include "missing_keyctl.h"
#include "missing_sched.h"
#include "missing_syscall_def.h"

/* ======================================================================= */

#if !HAVE_FCHMODAT2
/* since kernel v6.6 (78252deb023cf0879256fcfbafe37022c390762b) */
static inline int missing_fchmodat2(int dirfd, const char *path, mode_t mode, int flags) {
        return syscall(__NR_fchmodat2, dirfd, path, mode, flags);
}

#  define fchmodat2 missing_fchmodat2
#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_KCMP
static inline int missing_kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2) {
        return syscall(__NR_kcmp, pid1, pid2, type, idx1, idx2);
}

#  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) {
        return syscall(__NR_keyctl, cmd, arg2, arg3, arg4, arg5);

#  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) {
        return syscall(__NR_add_key, type, description, payload, plen, ringid);

#  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) {
        return syscall(__NR_request_key, type, description, callout_info, destringid);

#  define request_key missing_request_key
}
#endif

/* ======================================================================= */

#if !HAVE_BPF
union bpf_attr;

static inline int missing_bpf(int cmd, union bpf_attr *attr, size_t size) {
        return (int) syscall(__NR_bpf, cmd, attr, size);
}

#  define bpf missing_bpf
#endif

/* ======================================================================= */

#if !HAVE_SET_MEMPOLICY
static inline long missing_set_mempolicy(int mode, const unsigned long *nodemask,
                           unsigned long maxnode) {
        return syscall(__NR_set_mempolicy, mode, nodemask, maxnode);
}

#  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) {
        return syscall(__NR_get_mempolicy, mode, nodemask, maxnode, addr, flags);
}

#  define get_mempolicy missing_get_mempolicy
#endif

/* ======================================================================= */

#if !HAVE_PIDFD_SEND_SIGNAL
/* since kernel v5.1 (3eb39f47934f9d5a3027fe00d906a45fe3a15fad) */
static inline int missing_pidfd_send_signal(int fd, int sig, siginfo_t *info, unsigned flags) {
        return syscall(__NR_pidfd_send_signal, fd, sig, info, flags);
}

#  define pidfd_send_signal missing_pidfd_send_signal
#endif

/* ======================================================================= */

#if !HAVE_PIDFD_OPEN
/* since kernel v5.3 (7615d9e1780e26e0178c93c55b73309a5dc093d7) */
static inline int missing_pidfd_open(pid_t pid, unsigned flags) {
        return syscall(__NR_pidfd_open, pid, flags);
}

#  define pidfd_open missing_pidfd_open
#endif

/* ======================================================================= */

#if !HAVE_RT_TGSIGQUEUEINFO
static inline int missing_rt_tgsigqueueinfo(pid_t tgid, pid_t tid, int sig, siginfo_t *info) {
        return syscall(__NR_rt_tgsigqueueinfo, tgid, tid, sig, info);
}

#  define rt_tgsigqueueinfo missing_rt_tgsigqueueinfo
#endif

/* ======================================================================= */

#if !HAVE_EXECVEAT
/* since kernel v3.19 (51f39a1f0cea1cacf8c787f652f26dfee9611874) */
static inline int missing_execveat(int dirfd, const char *pathname,
                                   char *const argv[], char *const envp[],
                                   int flags) {
        return syscall(__NR_execveat, dirfd, pathname, argv, envp, flags);
}

#  define execveat missing_execveat
#endif

/* ======================================================================= */

#if !HAVE_CLOSE_RANGE
/* since kernel v5.9 (9b4feb630e8e9801603f3cab3a36369e3c1cf88d) */
static inline int missing_close_range(unsigned first_fd, unsigned end_fd, unsigned flags) {
        /* Kernel-side the syscall expects fds as unsigned integers (just like close() actually), while
         * userspace exclusively uses signed integers for fds. glibc chose to expose it 1:1 however, hence we
         * do so here too, even if we end up passing signed fds to it most of the time. */
        return syscall(__NR_close_range,
                       first_fd,
                       end_fd,
                       flags);
}

#  define close_range missing_close_range
#endif

/* ======================================================================= */

#if !HAVE_SCHED_SETATTR
/* since kernel 3.14 (e6cfc0295c7d51b008999a8b13a44fb43f8685ea) */
static inline ssize_t missing_sched_setattr(pid_t pid, struct sched_attr *attr, unsigned int flags) {
        return syscall(__NR_sched_setattr, pid, attr, flags);
}

#  define sched_setattr missing_sched_setattr
#endif

/* ======================================================================= */

/* glibc does not provide clone() on ia64, only clone2(). Not only that, but it also doesn't provide a
 * prototype, only the symbol in the shared library (it provides a prototype for clone(), but not the
 * symbol in the shared library). */
#if defined(__ia64__)
int __clone2(int (*fn)(void *), void *stack_base, size_t stack_size, int flags, void *arg);
#define HAVE_CLONE 0
#else
/* We know that everywhere else clone() is available, so we don't bother with a meson check (that takes time
 * at build time) and just define it. Once the kernel drops ia64 support, we can drop this too. */
#define HAVE_CLONE 1
#endif

/* ======================================================================= */

#if !HAVE_QUOTACTL_FD
/* since kernel v5.14 (64c2c2c62f92339b176ea24403d8db16db36f9e6) */
static inline int missing_quotactl_fd(int fd, int cmd, int id, void *addr) {
        return syscall(__NR_quotactl_fd, fd, cmd, id, addr);
}

#  define quotactl_fd missing_quotactl_fd
#endif

/* ======================================================================= */

#if !HAVE_SETXATTRAT
/* since kernel v6.13 (6140be90ec70c39fa844741ca3cc807dd0866394) */
static inline int missing_setxattrat(int fd, const char *path, int at_flags, const char *name, const struct xattr_args *args, size_t size) {
        return syscall(__NR_setxattrat, fd, path, at_flags, name, args, size);
}

#  define setxattrat missing_setxattrat
#endif

/* ======================================================================= */

#if !HAVE_REMOVEXATTRAT
/* since kernel v6.13 (6140be90ec70c39fa844741ca3cc807dd0866394) */
static inline int missing_removexattrat(int fd, const char *path, int at_flags, const char *name) {
        return syscall(__NR_removexattrat, fd, path, at_flags, name);
}

#  define removexattrat missing_removexattrat
#endif
Commit	Line	Data
	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