syscall.h File Reference

x86_64 Linux direct syscalls. More...

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Macros
#define	SYS_read   0
	read(2) syscall number
#define	SYS_write   1
	write(2) syscall number
#define	SYS_close   3
	close(2) syscall number
#define	SYS_newfstatat   262
	newfstatat(2) syscall number
#define	SYS_pread64   17
	pread64(2) syscall number
#define	SYS_mmap   9
	mmap(2) syscall number
#define	SYS_mprotect   10
	mprotect(2) syscall number
#define	SYS_munmap   11
	munmap(2) syscall number
#define	SYS_rt_sigaction   13
	rt_sigaction(2) syscall number
#define	SYS_rt_sigprocmask   14
	rt_sigprocmask(2) syscall number
#define	SYS_rt_sigreturn   15
	rt_sigreturn(2) syscall number
#define	SYS_socket   41
	socket(2) syscall number
#define	SYS_sendmsg   46
	sendmsg(2) syscall number
#define	SYS_sendto   44
	sendto(2) syscall number
#define	SYS_recvfrom   45
	recvfrom(2) syscall number
#define	SYS_bind   49
	bind(2) syscall number
#define	SYS_recvmmsg   299
	recvmmsg(2) syscall number
#define	SYS_setsockopt   54
	setsockopt(2) syscall number
#define	SYS_clone   56
	clone(2) syscall number
#define	SYS_exit   60
	exit(2) syscall number
#define	SYS_gettid   186
	gettid(2) syscall number
#define	SYS_futex   202
	futex(2) syscall number
#define	SYS_sched_setaffinity   203
	sched_setaffinity(2) syscall number
#define	SYS_sched_getaffinity   204
	sched_getaffinity(2) syscall number
#define	SYS_clock_gettime   228
	clock_gettime(2) syscall number
#define	SYS_openat   257
	openat(2) syscall number
#define	SYS_mkdirat   258
	mkdirat(2) syscall number
#define	SYS_getrandom   318
	getrandom(2) syscall number
#define	SYS_fork   57
	fork(2) syscall number
#define	SYS_wait4   61
	wait4(2) syscall number
#define	SYS_exit_group   231
	exit_group(2) syscall number
#define	SIGTERM   15
	Signal numbers used by this SDK (Linux, all architectures).
#define	SA_RESTORER   0x04000000u
	x86_64 Linux rt_sigaction(2) requires SA_RESTORER plus a userspace trampoline that issues rt_sigreturn(2); the kernel refuses a bare handler with no restorer.
#define	syscall2(n, a, b)
	Two-argument syscall: syscall6() with the trailing arguments zeroed.
#define	syscall3(n, a, b, c)
	Three-argument syscall: syscall6() with the trailing arguments zeroed.
#define	syscall4(n, a, b, c, d)
	Four-argument syscall: syscall6() with the trailing arguments zeroed.
#define	syscall5(n, a, b, c, d, e)
	Five-argument syscall: syscall6() with the trailing argument zeroed.
#define	syscall1(n, a)
	One-argument syscall: syscall6() with the trailing arguments zeroed.

Typedefs
typedef unsigned long	u64
	unsigned 64-bit integer
typedef long	i64
	signed 64-bit integer
typedef unsigned int	u32
	unsigned 32-bit integer
typedef int	i32
	signed 32-bit integer
typedef unsigned short	u16
	unsigned 16-bit integer
typedef unsigned char	u8
	unsigned 8-bit integer / byte
typedef i64	ssz
	signed size (ssize_t equivalent)
typedef u64	usz
	unsigned size (size_t equivalent)

Functions
static i64	syscall6 (i64 n, i64 a, i64 b, i64 c, i64 d, i64 e, i64 f)
	Six-argument raw x86_64 Linux syscall.

Detailed Description

x86_64 Linux direct syscalls.

No libc.

Also defines the SDK's fixed-width integer types: with no libc there is no <stdint.h>, so every other header builds on the typedefs here.

Macro Definition Documentation

SIGTERM

#define SIGTERM   15

Signal numbers used by this SDK (Linux, all architectures).

termination request

syscall1

#define syscall1	(		n,
			a )

Value:

syscall6((n), (i64)(a), 0, 0, 0, 0, 0)

One-argument syscall: syscall6() with the trailing arguments zeroed.

syscall2

#define syscall2	(		n,
			a,
			b )

Value:

syscall6((n), (i64)(a), (i64)(b), 0, 0, 0, 0)

Two-argument syscall: syscall6() with the trailing arguments zeroed.

syscall3

#define syscall3	(		n,
			a,
			b,
			c )

Value:

syscall6((n), (i64)(a), (i64)(b), (i64)(c), 0, 0, 0)

Three-argument syscall: syscall6() with the trailing arguments zeroed.

syscall4

#define syscall4	(		n,
			a,
			b,
			c,
			d )

Value:

syscall6((n), (i64)(a), (i64)(b), (i64)(c), (i64)(d), 0, 0)

Four-argument syscall: syscall6() with the trailing arguments zeroed.

syscall5

#define syscall5	(		n,
			a,
			b,
			c,
			d,
			e )

Value:

syscall6((n), (i64)(a), (i64)(b), (i64)(c), (i64)(d), (i64)(e), 0)

Five-argument syscall: syscall6() with the trailing argument zeroed.

Function Documentation

syscall6()

i64 syscall6 ( i64 n, i64 a, i64 b, i64 c, i64 d, i64 e, i64 f )

inlinestatic

Six-argument raw x86_64 Linux syscall.

Arguments follow the x86_64 syscall ABI register order: number in rax, then rdi, rsi, rdx, r10, r8, r9. rcx/r11 are clobbered by the syscall instruction. The syscall1/syscall3 wrappers pass 0 for their unused trailing arguments.

Parameters

n	syscall number (one of the SYS_* constants)
a	1st argument (rdi)
b	2nd argument (rsi)
c	3rd argument (rdx)
d	4th argument (r10)
e	5th argument (r8)
f	6th argument (r9)

Returns

the kernel's return value; negative values are -errno