• NAME
  
  syscall - indirect system call
• SYNOPSIS
  

  
   "#define _GNU_SOURCE     "     "   /* or _BSD_SOURCE or _SVID_SOURCE */"
   #include <unistd.h>
   "#include <sys/syscall.h>   "  "/* For SYS_xxx definitions */"
  
   int syscall(int  number , ...);
  

• DESCRIPTION
  
  syscall ()
  performs the system call whose assembly language
  interface has the specified
  number
  with the specified arguments.
  Symbolic constants for system calls can be found in the header file
  <sys/syscall.h> .
  
• RETURN VALUE
  
  The return value is defined by the system call being invoked.
  In general, a 0 return value indicates success.
  A -1 return value indicates an error,
  and an error code is stored in
  errno .
  
• NOTES
  
  syscall ()
  first appeared in
  4BSD.
  
• EXAMPLE
  

  
  #define _GNU_SOURCE
  #include <unistd.h>
  #include <sys/syscall.h>
  #include <sys/types.h>
  
  int
  main(int argc, char *argv[])
  {
      pid_t tid;
  
      tid = syscall(SYS_gettid);
  }
  

• SEE ALSO
  
  _syscall(2) , intro(2) , syscalls(2)
• COLOPHON
  
  This page is part of release 3.19 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.

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