execution process problem
Hi , I know little about the system call
I write a test file hello.c
[code]#include<stdio.h>
int main()
{
printf("hello");
return 0;
}
[/code]
I use the dtrace to probe the system call mmap, and found this syscall has been invoked twice during the execution, and I print tout he stack.
first invoke
libc.so.1`mmap+0xc
libc.so.1`lmalloc+0xa4
libc.so.1`atexit+0x1c
libc.so.1`libc_init+0x44
ld.so.1`call_init+0x70
ld.so.1`setup+0x13ac
ld.so.1`_setup+0x3b0
ld.so.1`_rt_boot+0x88
second :
ld.so.1`mmap+0xc
ld.so.1`file_open+0x2e0
ld.so.1`find_path+0x170
ld.so.1`load_so+0x210
ld.so.1`load_path+0x68
ld.so.1`_elf_lookup_filtee+0x4b8
ld.so.1`elf_lookup_filtee+0x90
ld.so.1`elf_find_sym+0x310
ld.so.1`_lookup_sym+0x60
ld.so.1`lookup_sym+0x240
ld.so.1`elf_bndr+0x14c
ld.so.1`elf_rtbndr+0x10
libc.so.1`0xff369288
libc.so.1`_ndoprnt+0x32c
libc.so.1`printf+0xf4
hello`main+0xc
hello`_start+0x5c
who can explain it, why system call mmap twice, and echo for what?
