file - 如何比较 vxworks shell 中的两个文件？

Question

我的目标上有两个大小相同的文件。我只是在想，如果他们真的一样吗？如何在 vxWorks shell 中检查？我的文件：

-> ls "/a0",1

Listing Directory /a0:
-rwxrwxrwx  1 0       0              2336692 Feb  1  1980 vxWorks
-rwxrwxrwx  1 0       0              2336692 Feb  1  1980 vxWorks2
value = 0 = 0x0
->

Answer 1

在 vxWorks shell 中比较两个文件非常简单。使用以下调用来做到这一点：

-> fd1=open("/a0/vxWorks",2,0)
New symbol "fd1" added to kernel symbol table.
fd1 = 0x8a4dfe0: value = 5 = 0x5
-> fd2=open("/a0/vxWorks2",2,0)
New symbol "fd2" added to kernel symbol table.
fd2 = 0x8a65fe0: value = 6 = 0x6
-> b1=malloc(2336692)
New symbol "b1" added to kernel symbol table.
b1 = 0x8a89fe0: value = 153153552 = 0x920f010
-> b2=malloc(2336692)
New symbol "b2" added to kernel symbol table.
b2 = 0x8a95fe0: value = 155490272 = 0x94497e0
-> read(fd1,b1,2336692)
value = 2336692 = 0x23a7b4 = pathCondense + 0x9c
-> read(fd2,b2,2336692)
value = 2336692 = 0x23a7b4 = pathCondense + 0x9c
-> strcmp(b1,b2)
value = 0 = 0x0

如果最后一次调用返回“0”，则表示文件相同。