linux从文件到进程的过程

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1.写个测试代码 test.c

#include <stdio.h>

int main(int argc, char *argv[])

{

printf("Hello World!\n");

return 0;

}

2.编译：gcc -o test test.c

3.用strace观察test执行的过程

$ vim test.c

$ gcc -o test test.c

$ strace ./test

execve("./test", ["./test"], [/* 42 vars */]) = 0

brk(0) = 0x9fe1000

access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)

mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7772000

access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)

open("/etc/ld.so.cache", O_RDONLY) = 3

fstat64(3, {st_mode=S_IFREG|0644, st_size=55621, ...}) = 0

mmap2(NULL, 55621, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7764000

close(3) = 0

access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)

open("/lib/tls/i686/cmov/libc.so.6", O_RDONLY) = 3

read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0000m\1\0004\0\0\0"..., 512) = 512

fstat64(3, {st_mode=S_IFREG|0755, st_size=1405508, ...}) = 0

mmap2(NULL, 1415592, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x658000

mprotect(0x7ab000, 4096, PROT_NONE) = 0

mmap2(0x7ac000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x153) = 0x7ac000

mmap2(0x7af000, 10664, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7af000

close(3) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7763000

set_thread_area({entry_number:-1 -> 6, base_addr:0xb77636c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0

mprotect(0x7ac000, 8192, PROT_READ) = 0

mprotect(0x8049000, 4096, PROT_READ) = 0

mprotect(0x9e8000, 4096, PROT_READ) = 0

munmap(0xb7764000, 55621) = 0

fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0

mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7771000

write(1, "Hello World!\n", 13Hello World!

) = 13

exit_group(0) = ?