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syscall(2)
NAME
  syscall - indirect system call

SYNOPSIS
  #include <sys/syscall.h>

  syscall(number, arg, ...)

DESCRIPTION
  The syscall system call performs the system call whose assembly language
  interface has the specified number, register arguments r0 and r1, and
  further arguments arg.

  The r0 value of the system call is returned.

RESTRICTIONS
  There is no way to simulate system calls such as pipe, which return values
  in register r1.

NOTES
  This interface is not recommended. An alternative interface is documented
  in chown(2).

DIAGNOSTICS
  When the C-bit is set, syscall returns -1 and sets the external variable
  errno.

RELATED INFORMATION
  Functions: errno(2), pipe(2)