linux - File/Calls substitution like LD_PRELOAD -

does there usual utility makes substitution on calls execve , open? ld_preload calls.

example:

have prog_a uses prog_b.

days ago prog_b updated , prog_a failed!(

usual solution next:

$: mv /usr/bin/prog_b /usr/bin/prog_b.new $: ln -s /usr/bin/prog_b.old /usr/bin/prog_b $: ./prog_a                                       # run  

but it's uncomfortably , dirty solution. in stories correct way so:

$: util "execve+open+stat:/usr/bin/prog_b=/usr/bin/prog_b.old" ./prog_a 

where execve,open & stat system calls. name of util?

i write special file_preload utility solve problem.

$: file_preload -c "execve+open+stat:/usr/bin/prog_b:/usr/bin/prog_b.old" ./prog_a 

it generates c++ code, compiles , ld_preload result lib.so file before run ./prog_a.

using can hook next calls:

1. open,fopen,fopen64
2. opendir,mkdir,rmdir
3. execve
4. unlink,unlinkat
5. stat,lstat,lstat64,_lxstat,_lxstat64,stat64
6. _xstat,_xstat64,__fxstatat
7. freopen,freopen64

please, run docs/tut.sh firstly (it's tutorial fp utility).