Hello,
I am trying to figure out the meaning of:
/proc/$PID/fd/*
files.
As:
- their name suggests
- as most of the descriptions on the web around indicate
- and consistently with wishful thinking
I thought that writing to /proc/$PID/0 would mean that designated
process will receive the written date.
To verify this, I wrote a small program:
-------------------------------------
#include <unistd.h>
char buf[10];
int main()
{
unsigned u = read(0, buf, 10);
write(1, buf, u);
return 0;
}
-------------------------------------
ran it:
./main
and then if I tried something like this:
echo "foo" > /proc/$PID/fd/0
the expectation were that the process would be able to read 4 bytes
from its standard input.
'f', 'o', 'o', '\n'
What actually happened was:
- "foo" string appeared on the appropriate terminal
- the "./main" process remained blocked in the "read" system call.
Is there somewhere a concise and correct description that explains this?
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