Getting cmd of process. about build-recorder HOT 2 CLOSED

@zvr another issue worth noting is that cmdline size is hardcoded to be that of PAGE_SIZE. Which means if a command is bigger than that it will be truncated. In my system currently running getconf PAGE_SIZE yields 4096.

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@zvr Perhaps a mixed solution would be:

1. Use cmdline to get only the executable's path
2. read the arguments from the syscall's parameters

This sounds good because PATH_MAX in my system is also 4096(and i suspect the same applies to most systems) which means that it's sufficient to hold any executable's path. Why do we care? Why not just read the executable from the syscall's parameters as well?

Well that's because that's more complicated, since there are 2 variants execve(2) and execveat(2), we will need to once again examine file descriptors and flags to be able to figure out the path, something which isn't the case for the command arguments since they are all supplied as a string.

from build-recorder.