strace 'open' calls in a library of an executable

浅浅的花香味﹌ 2021-11-26 07:52 164阅读 0赞

I have a program with no source code.

When I run it, I have a "Can't open file..." error in the logs.

I called **strace** to trace the *open* calls on the kernel, in that way:

strace -e trace=open,close,read,write,connect,accept your-command-here

However, it seems there is none of the *open* calls I am expecting (that shall happen before that the log says "Can't open file...")

The executable indeed delegated the *open* call to a tierce library. It seems that **strace** only trace the calls from the executable on the kernel, not those of the libraries depencies.

I tried to use **ltrace** to trace what happens in the subsequent libraries, but it doesnt display the same informations as **strace**, only the function calls (which are not human-readable).

Is there a way to run **strace** on the executable and the libraires in the same time ?

`strace` should be showing all of the `open` calls. However:

*  Perhaps your application calls a subprocess to do work. For that case, you can add a `-f`option.
 *  On the other hand, it may be doing the work by opening a socket (or similar) connection to another process. For that case, you will not see any trace. Likewise, if you are using the [syslog][]interface, then the actual work may be done outside your process, potentially in the kernel where you cannot trace with this tool.

[syslog]: http://www.gnu.org/software/libc/manual/html_node/Syslog.html

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