musl/src/internal/syscall.h

#ifndef _INTERNAL_SYSCALL_H
#define _INTERNAL_SYSCALL_H

#include <features.h>
#include <errno.h>
#include <sys/syscall.h>
#include "syscall_arch.h"

#ifndef SYSCALL_RLIM_INFINITY
#define SYSCALL_RLIM_INFINITY (~0ULL)
#endif

#ifndef SYSCALL_MMAP2_UNIT
#define SYSCALL_MMAP2_UNIT 4096ULL
#endif

#ifndef __SYSCALL_LL_PRW
#define __SYSCALL_LL_PRW(x) __SYSCALL_LL_O(x)
#endif

#ifndef __scc
#define __scc(X) ((long) (X))
typedef long syscall_arg_t;
#endif

hidden long __syscall_ret(unsigned long),
	__syscall_cp(syscall_arg_t, syscall_arg_t, syscall_arg_t, syscall_arg_t,
	             syscall_arg_t, syscall_arg_t, syscall_arg_t);

#define __syscall1(n,a) __syscall1(n,__scc(a))
#define __syscall2(n,a,b) __syscall2(n,__scc(a),__scc(b))
#define __syscall3(n,a,b,c) __syscall3(n,__scc(a),__scc(b),__scc(c))
#define __syscall4(n,a,b,c,d) __syscall4(n,__scc(a),__scc(b),__scc(c),__scc(d))
#define __syscall5(n,a,b,c,d,e) __syscall5(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e))
#define __syscall6(n,a,b,c,d,e,f) __syscall6(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f))
#define __syscall7(n,a,b,c,d,e,f,g) __syscall7(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f),__scc(g))

#define __SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n
#define __SYSCALL_NARGS(...) __SYSCALL_NARGS_X(__VA_ARGS__,7,6,5,4,3,2,1,0,)
#define __SYSCALL_CONCAT_X(a,b) a##b
#define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X(a,b)
#define __SYSCALL_DISP(b,...) __SYSCALL_CONCAT(b,__SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)

#define __syscall(...) __SYSCALL_DISP(__syscall,__VA_ARGS__)
#define syscall(...) __syscall_ret(__syscall(__VA_ARGS__))

#define socketcall(nm,a,b,c,d,e,f) __syscall_ret(__socketcall(nm,a,b,c,d,e,f))
#define socketcall_cp(nm,a,b,c,d,e,f) __syscall_ret(__socketcall_cp(nm,a,b,c,d,e,f))

#define __syscall_cp0(n) (__syscall_cp)(n,0,0,0,0,0,0)
#define __syscall_cp1(n,a) (__syscall_cp)(n,__scc(a),0,0,0,0,0)
#define __syscall_cp2(n,a,b) (__syscall_cp)(n,__scc(a),__scc(b),0,0,0,0)
#define __syscall_cp3(n,a,b,c) (__syscall_cp)(n,__scc(a),__scc(b),__scc(c),0,0,0)
#define __syscall_cp4(n,a,b,c,d) (__syscall_cp)(n,__scc(a),__scc(b),__scc(c),__scc(d),0,0)
#define __syscall_cp5(n,a,b,c,d,e) (__syscall_cp)(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),0)
#define __syscall_cp6(n,a,b,c,d,e,f) (__syscall_cp)(n,__scc(a),__scc(b),__scc(c),__scc(d),__scc(e),__scc(f))

#define __syscall_cp(...) __SYSCALL_DISP(__syscall_cp,__VA_ARGS__)
#define syscall_cp(...) __syscall_ret(__syscall_cp(__VA_ARGS__))

static inline long __alt_socketcall(int sys, int sock, int cp, long a, long b, long c, long d, long e, long f)
{
	long r;
	if (cp) r = __syscall_cp(sys, a, b, c, d, e, f);
	else r = __syscall(sys, a, b, c, d, e, f);
	if (r != -ENOSYS) return r;
#ifdef SYS_socketcall
	if (cp) r = __syscall_cp(SYS_socketcall, sock, ((long[6]){a, b, c, d, e, f}));
	else r = __syscall(SYS_socketcall, sock, ((long[6]){a, b, c, d, e, f}));
#endif
	return r;
}
#define __socketcall(nm, a, b, c, d, e, f) __alt_socketcall(SYS_##nm, __SC_##nm, 0, \
	(long)(a), (long)(b), (long)(c), (long)(d), (long)(e), (long)(f))
#define __socketcall_cp(nm, a, b, c, d, e, f) __alt_socketcall(SYS_##nm, __SC_##nm, 1, \
	(long)(a), (long)(b), (long)(c), (long)(d), (long)(e), (long)(f))

/* fixup legacy 16-bit junk */

#ifdef SYS_getuid32
#undef SYS_lchown
#undef SYS_getuid
#undef SYS_getgid
#undef SYS_geteuid
#undef SYS_getegid
#undef SYS_setreuid
#undef SYS_setregid
#undef SYS_getgroups
#undef SYS_setgroups
#undef SYS_fchown
#undef SYS_setresuid
#undef SYS_getresuid
#undef SYS_setresgid
#undef SYS_getresgid
#undef SYS_chown
#undef SYS_setuid
#undef SYS_setgid
#undef SYS_setfsuid
#undef SYS_setfsgid
#define SYS_lchown SYS_lchown32
#define SYS_getuid SYS_getuid32
#define SYS_getgid SYS_getgid32
#define SYS_geteuid SYS_geteuid32
#define SYS_getegid SYS_getegid32
#define SYS_setreuid SYS_setreuid32
#define SYS_setregid SYS_setregid32
#define SYS_getgroups SYS_getgroups32
#define SYS_setgroups SYS_setgroups32
#define SYS_fchown SYS_fchown32
#define SYS_setresuid SYS_setresuid32
#define SYS_getresuid SYS_getresuid32
#define SYS_setresgid SYS_setresgid32
#define SYS_getresgid SYS_getresgid32
#define SYS_chown SYS_chown32
#define SYS_setuid SYS_setuid32
#define SYS_setgid SYS_setgid32
#define SYS_setfsuid SYS_setfsuid32
#define SYS_setfsgid SYS_setfsgid32
#endif


/* fixup legacy 32-bit-vs-lfs64 junk */

#ifdef SYS_fcntl64
#undef SYS_fcntl
#define SYS_fcntl SYS_fcntl64
#endif

#ifdef SYS_getdents64
#undef SYS_getdents
#define SYS_getdents SYS_getdents64
#endif

#ifdef SYS_ftruncate64
#undef SYS_ftruncate
#undef SYS_truncate
#define SYS_ftruncate SYS_ftruncate64
#define SYS_truncate SYS_truncate64
#endif

#ifdef SYS_stat64
#undef SYS_stat
#define SYS_stat SYS_stat64
#endif

#ifdef SYS_fstat64
#undef SYS_fstat
#define SYS_fstat SYS_fstat64
#endif

#ifdef SYS_lstat64
#undef SYS_lstat
#define SYS_lstat SYS_lstat64
#endif

#ifdef SYS_statfs64
#undef SYS_statfs
#define SYS_statfs SYS_statfs64
#endif

#ifdef SYS_fstatfs64
#undef SYS_fstatfs
#define SYS_fstatfs SYS_fstatfs64
#endif

#if defined(SYS_newfstatat)
#undef SYS_fstatat
#define SYS_fstatat SYS_newfstatat
#elif defined(SYS_fstatat64)
#undef SYS_fstatat
#define SYS_fstatat SYS_fstatat64
#endif

#ifdef SYS_ugetrlimit
#undef SYS_getrlimit
#define SYS_getrlimit SYS_ugetrlimit
#endif

#ifdef SYS__newselect
#undef SYS_select
#define SYS_select SYS__newselect
#endif

#ifdef SYS_pread64
#undef SYS_pread
#undef SYS_pwrite
#define SYS_pread SYS_pread64
#define SYS_pwrite SYS_pwrite64
#endif

#ifdef SYS_fadvise64_64
#undef SYS_fadvise
#define SYS_fadvise SYS_fadvise64_64
#elif defined(SYS_fadvise64)
#undef SYS_fadvise
#define SYS_fadvise SYS_fadvise64
#endif

#ifdef SYS_sendfile64
#undef SYS_sendfile
#define SYS_sendfile SYS_sendfile64
#endif

#ifndef SYS_timer_settime
#define SYS_timer_settime SYS_timer_settime32
#endif

#ifndef SYS_timer_gettime
#define SYS_timer_gettime SYS_timer_gettime32
#endif

#ifndef SYS_timerfd_settime
#define SYS_timerfd_settime SYS_timerfd_settime32
#endif

#ifndef SYS_timerfd_gettime
#define SYS_timerfd_gettime SYS_timerfd_gettime32
#endif

#ifndef SYS_clock_settime
#define SYS_clock_settime SYS_clock_settime32
#endif

#ifndef SYS_clock_gettime
#define SYS_clock_gettime SYS_clock_gettime32
#endif

#ifndef SYS_clock_getres
#define SYS_clock_getres SYS_clock_getres_time32
#endif

#ifndef SYS_clock_nanosleep
#define SYS_clock_nanosleep SYS_clock_nanosleep_time32
#endif

#ifndef SYS_gettimeofday
#define SYS_gettimeofday SYS_gettimeofday_time32
#endif

#ifndef SYS_settimeofday
#define SYS_settimeofday SYS_settimeofday_time32
#endif

/* Ensure that the plain syscall names are defined even for "time64-only"
 * archs. These facilitate callers passing null time arguments, and make
 * tests for establishing which to use/fallback-to more consistent when
 * they do need to be called with time arguments. */

#ifndef SYS_clock_gettime
#define SYS_clock_gettime SYS_clock_gettime64
#endif

#ifndef SYS_clock_settime
#define SYS_clock_settime SYS_clock_settime64
#endif

#ifndef SYS_clock_adjtime
#define SYS_clock_adjtime SYS_clock_adjtime64
#endif

#ifndef SYS_clock_getres
#define SYS_clock_getres SYS_clock_getres_time64
#endif

#ifndef SYS_clock_nanosleep
#define SYS_clock_nanosleep SYS_clock_nanosleep_time64
#endif

#ifndef SYS_timer_gettime
#define SYS_timer_gettime SYS_timer_gettime64
#endif

#ifndef SYS_timer_settime
#define SYS_timer_settime SYS_timer_settime64
#endif

#ifndef SYS_timerfd_gettime
#define SYS_timerfd_gettime SYS_timerfd_gettime64
#endif

#ifndef SYS_timerfd_settime
#define SYS_timerfd_settime SYS_timerfd_settime64
#endif

#ifndef SYS_utimensat
#define SYS_utimensat SYS_utimensat_time64
#endif

#ifndef SYS_pselect6
#define SYS_pselect6 SYS_pselect6_time64
#endif

#ifndef SYS_ppoll
#define SYS_ppoll SYS_ppoll_time64
#endif

#ifndef SYS_recvmmsg
#define SYS_recvmmsg SYS_recvmmsg_time64
#endif

#ifndef SYS_mq_timedsend
#define SYS_mq_timedsend SYS_mq_timedsend_time64
#endif

#ifndef SYS_mq_timedreceive
#define SYS_mq_timedreceive SYS_mq_timedreceive_time64
#endif

/* SYS_semtimedop omitted because SYS_ipc may provide it */

#ifndef SYS_rt_sigtimedwait
#define SYS_rt_sigtimedwait SYS_rt_sigtimedwait_time64
#endif

#ifndef SYS_futex
#define SYS_futex SYS_futex_time64
#endif

#ifndef SYS_sched_rr_get_interval
#define SYS_sched_rr_get_interval SYS_sched_rr_get_interval_time64
#endif




/* socketcall calls */

#define __SC_socket      1
#define __SC_bind        2
#define __SC_connect     3
#define __SC_listen      4
#define __SC_accept      5
#define __SC_getsockname 6
#define __SC_getpeername 7
#define __SC_socketpair  8
#define __SC_send        9
#define __SC_recv        10
#define __SC_sendto      11
#define __SC_recvfrom    12
#define __SC_shutdown    13
#define __SC_setsockopt  14
#define __SC_getsockopt  15
#define __SC_sendmsg     16
#define __SC_recvmsg     17
#define __SC_accept4     18
#define __SC_recvmmsg    19
#define __SC_sendmmsg    20

/* This is valid only because all socket syscalls are made via
 * socketcall, which always fills unused argument slots with zeros. */
#ifndef SYS_accept
#define SYS_accept SYS_accept4
#endif

#ifndef SO_RCVTIMEO_OLD
#define SO_RCVTIMEO_OLD  20
#endif
#ifndef SO_SNDTIMEO_OLD
#define SO_SNDTIMEO_OLD  21
#endif

#define SO_TIMESTAMP_OLD    29
#define SO_TIMESTAMPNS_OLD  35
#define SO_TIMESTAMPING_OLD 37
#define SCM_TIMESTAMP_OLD    SO_TIMESTAMP_OLD
#define SCM_TIMESTAMPNS_OLD  SO_TIMESTAMPNS_OLD
#define SCM_TIMESTAMPING_OLD SO_TIMESTAMPING_OLD

#ifndef SIOCGSTAMP_OLD
#define SIOCGSTAMP_OLD 0x8906
#endif
#ifndef SIOCGSTAMPNS_OLD
#define SIOCGSTAMPNS_OLD 0x8907
#endif

#ifdef SYS_open
#define __sys_open2(x,pn,fl) __syscall2(SYS_open, pn, (fl)|O_LARGEFILE)
#define __sys_open3(x,pn,fl,mo) __syscall3(SYS_open, pn, (fl)|O_LARGEFILE, mo)
#define __sys_open_cp2(x,pn,fl) __syscall_cp2(SYS_open, pn, (fl)|O_LARGEFILE)
#define __sys_open_cp3(x,pn,fl,mo) __syscall_cp3(SYS_open, pn, (fl)|O_LARGEFILE, mo)
#else
#define __sys_open2(x,pn,fl) __syscall3(SYS_openat, AT_FDCWD, pn, (fl)|O_LARGEFILE)
#define __sys_open3(x,pn,fl,mo) __syscall4(SYS_openat, AT_FDCWD, pn, (fl)|O_LARGEFILE, mo)
#define __sys_open_cp2(x,pn,fl) __syscall_cp3(SYS_openat, AT_FDCWD, pn, (fl)|O_LARGEFILE)
#define __sys_open_cp3(x,pn,fl,mo) __syscall_cp4(SYS_openat, AT_FDCWD, pn, (fl)|O_LARGEFILE, mo)
#endif

#define __sys_open(...) __SYSCALL_DISP(__sys_open,,__VA_ARGS__)
#define sys_open(...) __syscall_ret(__sys_open(__VA_ARGS__))

#define __sys_open_cp(...) __SYSCALL_DISP(__sys_open_cp,,__VA_ARGS__)
#define sys_open_cp(...) __syscall_ret(__sys_open_cp(__VA_ARGS__))

hidden void __procfdname(char __buf[static 15+3*sizeof(int)], unsigned);

hidden void *__vdsosym(const char *, const char *);

#endif