/* * uname - print system information * * usage: uname [-amnrsv] * */#include <config.h>#include <stdio.h>#include "bashtypes.h"#if defined (HAVE_UNAME)#  include <sys/utsname.h>#elsestruct utsname {	char	sysname[32];	char	nodename[32];	char	release[32];	char	version[32];	char	machine[32];};#endif#include <errno.h>#include "builtins.h"#include "shell.h"#include "bashgetopt.h"#define FLAG_SYSNAME	0x01	/* -s */#define FLAG_NODENAME	0x02	/* -n */#define FLAG_RELEASE	0x04	/* -r */#define FLAG_VERSION	0x08	/* -v */#define FLAG_MACHINE	0x10	/* -m, -p */#define FLAG_ALL	0x1f#ifndef errnoextern int errno;#endifstatic void uprint();static int uname_flags;uname_builtin (list)     WORD_LIST *list;{  int opt, r;  struct utsname uninfo;  uname_flags = 0;  reset_internal_getopt ();  while ((opt = internal_getopt (list, "amnprsv")) != -1)    {      switch (opt)	{	case 'a':	  uname_flags |= FLAG_ALL;	  break;	case 'm':	case 'p':	  uname_flags |= FLAG_MACHINE;	  break;	case 'n':	  uname_flags |= FLAG_NODENAME;	  break;	case 'r':	  uname_flags |= FLAG_RELEASE;	  break;	case 's':	  uname_flags |= FLAG_SYSNAME;	  break;	case 'v':	  uname_flags |= FLAG_VERSION;	  break;	default:	  builtin_usage ();	  return (EX_USAGE);	}    }  list = loptend;  if (list)    {      builtin_usage ();      return (EX_USAGE);    }  if (uname_flags == 0)    uname_flags = FLAG_SYSNAME;  /* Only ancient systems will not have uname(2). */#ifdef HAVE_UNAME  if (uname (&uninfo) < 0)    {      builtin_error ("cannot get system name: %s", strerror (errno));      return (EXECUTION_FAILURE);    }#else  builtin_error ("cannot get system information: uname(2) not available");  return (EXECUTION_FAILURE);#endif  uprint (FLAG_SYSNAME, uninfo.sysname);  uprint (FLAG_NODENAME, uninfo.nodename);  uprint (FLAG_RELEASE, uninfo.release);  uprint (FLAG_VERSION, uninfo.version);  uprint (FLAG_MACHINE, uninfo.machine);  return (EXECUTION_SUCCESS);}static voiduprint (flag, info)     int flag;     char *info;{  if (uname_flags & flag)    {      uname_flags &= ~flag;      printf ("%s%c", info, uname_flags ? ' ' : '\n');    }}char *uname_doc[] = {	"display information about the system",	(char *)NULL};struct builtin uname_struct = {	"uname",	uname_builtin,	BUILTIN_ENABLED,	uname_doc,	"uname [-amnrsv]",	0};