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hyangah cmd/pprof: disable readline UI support for TERM=dumb
In general, dumb terminal indicates terminal with limited capability.
It may provide no support for special character sequences, e.g., no
handling of ANSI escape sequences. Its input/output handling behavior
may deviate from what's described in termios or terminfo. E.g., in
the shell in emacs, even after successfully setting the terminal to
raw mode, the terminal behaves as if it's still operating in canonical
mode since emacs is doing input processing first.

Readline support can be broken in various ways in dumb terminal mode,
so we want to disable readline or advanced UI features. The easiest
way to detect dumb terminal is to check the environment variable "TERM".

Fixes #26254

Change-Id: I6b652eb555bc03b84405aae08b0b25d111fbb8b0
Reviewed-on: https://go-review.googlesource.com/122879
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Latest commit 5e70b13 Jul 10, 2018

README

This directory is the copy of Google's pprof shipped as part of the Go distribution.
The bulk of the code is vendored from github.com/google/pprof and is in
../vendor/github.com/google/pprof.

Two important notes:

1. Using github.com/google/pprof directly (for example, after installing
with "go get") should work with Go programs, but we cannot guarantee that.
What we test is that the "go tool pprof" shipped with each Go release works
with programs from that release.

2. Pprof is used inside Google for C++, Java, and Go programs.
Because it was developed for that broader context, it is overgeneralized
when used here for the specific use case of profiling standard Go programs.
However, we've left the abstractions intact in order to share updates
between our vendored copy and Google's internal one.
Please do not take the level of abstraction in this program as an example
to follow in your own.