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annotate packages/language/c/libc/startup/current/src/main.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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1 //=======================================================================
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2 //
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3 // main.cxx
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4 //
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5 // Default main() function
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6 //
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7 //========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors:
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36 // Date: 2000-04-30
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37 // Purpose: Provide a default empty main() function
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38 // Description: This file provides a default empty main() function so
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39 // that things don't fall apart if the user starts the
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40 // ISO C environment (the default setting) but doesn't
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41 // provide their own main(). This is taken advantage of
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42 // in some tests (for example)
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43 // Usage: Obviously simply override main() in your own program to
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44 // prevent the use of the one below
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45 //
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46 //####DESCRIPTIONEND####
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47 //
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48 //========================================================================
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49
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50 // CONFIGURATION
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51
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52 #include <pkgconf/system.h> // for CYGPKG_KERNEL
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53
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54 // INCLUDES
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55
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56 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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57 #include <cyg/infra/cyg_trac.h> // Common tracing support
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58 #include <cyg/infra/cyg_ass.h> // Common assertion support
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59
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60 // FUNCTION PROTOTYPES
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61
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62 // We provide a weakly named main to allow this to link if the user
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63 // doesn't provide their own main. This isn't strictly good behaviour,
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64 // but if the user wants good performance then of _course_ they should
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65 // play with the config options and this won't be called. Or it might
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66 // be "giving them enough rope" etc. :-)
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67
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68 externC int
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69 main( int argc, char *argv[] ) __attribute__((weak));
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70
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71 externC void
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72 cyg_user_start(void);
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73
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74 // FUNCTIONS
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75
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76 externC int
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77 main( int argc, char *argv[] )
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78 {
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79 CYG_REPORT_FUNCNAMETYPE("main", "returning %d" );
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80
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81 // try to be helpful by diagnosing malformed arguments
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82 CYG_PRECONDITION( argv != NULL, "argv is NULL!" );
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83 CYG_PRECONDITION( argv[argc] == NULL, "argv[argc] isn't NULL!" );
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84
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85 CYG_REPORT_FUNCARG2("argc=%d, argv[0]=%s", argc,
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86 (CYG_ADDRWORD)((argv[0]==NULL) ? "NULL" : argv[0]) );
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87
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88 CYG_TRACE0( true, "This is the system-supplied default main()" );
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89
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90 // If the kernel isn't present then cyg_libc_invoke_main() will have assumed
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91 // main() is present and will call it. But if we're here, then
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92 // evidently the user didn't supply one - which can't be right. So we
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93 // assume that they have useful code to run in cyg_user_start() instead.
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94 // Its better than just exiting
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95 #ifndef CYGPKG_KERNEL
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96 cyg_user_start();
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97 #endif
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98
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99 CYG_REPORT_RETVAL(0);
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100 return 0; // some CPUs have 0 hard-wired - faster than a reg
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101 } // main()
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102
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103 // EOF main.cxx