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How does a C/C++ program call the main() function?

cristi:test diciu$ otool -l ./a.out | grep -A 10 LC_UNIXTHREAD
        cmd LC_UNIXTHREAD
    cmdsize 80
     flavor i386_THREAD_STATE
      count i386_THREAD_STATE_COUNT
[..]
        ss  0x00000000 eflags 0x00000000 eip 0x00001f8c cs  0x00000000
[..]
cristi:test diciu$ nm ./a.out
0000200c D _NXArgc
00002008 D _NXArgv
00002000 D ___progname
00001fe0 t __dyld_func_lookup
00001000 A __mh_execute_header
[..]
00001f8c T start
(gdb) b start
Breakpoint 1 at 0x1f90
(gdb) b main
Breakpoint 2 at 0x1ff4
(gdb) r
Starting program: /Users/diciu/Programming/test/a.out 
Reading symbols for shared libraries ++. done

Breakpoint 1, 0x00001f90 in start ()

Tags: c c++ main

Source: By as answer to the question

This code snippet was collected from stackoverflow, and is licensed under CC BY-SA 4.0


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