cmd,proc,terminal,debugger: Support default file descriptor redirects

Adds features to support default file descriptor redirects for the
target process:

1. A new command line flag '--redirect' and '-r' are added to specify
   file redirects for the target process
2. New syntax is added to the 'restart' command to specify file
   redirects.
3. Interactive instances will check if stdin/stdout and stderr are
   terminals and print a helpful error message if they aren't.

Documentation/cli/README.md

@@ -412,17 +412,23 @@ Restart process.
 
 For recorded targets the command takes the following forms:
 
-	restart				resets ot the start of the recording
-	restart [checkpoint]		resets the recording to the given checkpoint
-	restart -r [newargv...]		re-records the target process
+	restart					resets ot the start of the recording
+	restart [checkpoint]			resets the recording to the given checkpoint
+	restart -r [newargv...]	[redirects...]	re-records the target process
 
 For live targets the command takes the following forms:
 
-	restart [newargv...]		restarts the process
+	restart [newargv...] [redirects...]	restarts the process
 
 If newargv is omitted the process is restarted (or re-recorded) with the same argument vector.
 If -noargs is specified instead, the argument vector is cleared.
 
+A list of file redirections can be specified after the new argument list to override the redirections defined using the '--redirect' command line option. A syntax similar to Unix shells is used:
+
+	<input.txt	redirects the standard input of the target process from input.txt
+	>output.txt	redirects the standard output of the target process to output.txt
+	2>error.txt	redirects the standard error of the target process to error.txt
+
 
 Aliases: r
 

Documentation/cli/starlark.md

@@ -51,7 +51,7 @@ threads() | Equivalent to API call [ListThreads](https://godoc.org/github.com/go
 types(Filter) | Equivalent to API call [ListTypes](https://godoc.org/github.com/go-delve/delve/service/rpc2#RPCServer.ListTypes)
 process_pid() | Equivalent to API call [ProcessPid](https://godoc.org/github.com/go-delve/delve/service/rpc2#RPCServer.ProcessPid)
 recorded() | Equivalent to API call [Recorded](https://godoc.org/github.com/go-delve/delve/service/rpc2#RPCServer.Recorded)
-restart(Position, ResetArgs, NewArgs, Rerecord, Rebuild) | Equivalent to API call [Restart](https://godoc.org/github.com/go-delve/delve/service/rpc2#RPCServer.Restart)
+restart(Position, ResetArgs, NewArgs, Rerecord, Rebuild, NewRedirects) | Equivalent to API call [Restart](https://godoc.org/github.com/go-delve/delve/service/rpc2#RPCServer.Restart)
 set_expr(Scope, Symbol, Value) | Equivalent to API call [Set](https://godoc.org/github.com/go-delve/delve/service/rpc2#RPCServer.Set)
 stacktrace(Id, Depth, Full, Defers, Opts, Cfg) | Equivalent to API call [Stacktrace](https://godoc.org/github.com/go-delve/delve/service/rpc2#RPCServer.Stacktrace)
 state(NonBlocking) | Equivalent to API call [State](https://godoc.org/github.com/go-delve/delve/service/rpc2#RPCServer.State)

Documentation/usage/dlv.md

@@ -19,19 +19,21 @@ Pass flags to the program you are debugging using `--`, for example:
 ### Options
 
 ```
-      --accept-multiclient   Allows a headless server to accept multiple client connections.
-      --api-version int      Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
-      --backend string       Backend selection (see 'dlv help backend'). (default "default")
-      --build-flags string   Build flags, to be passed to the compiler.
-      --check-go-version     Checks that the version of Go in use is compatible with Delve. (default true)
-      --headless             Run debug server only, in headless mode.
-      --init string          Init file, executed by the terminal client.
-  -l, --listen string        Debugging server listen address. (default "127.0.0.1:0")
-      --log                  Enable debugging server logging.
-      --log-dest string      Writes logs to the specified file or file descriptor (see 'dlv help log').
-      --log-output string    Comma separated list of components that should produce debug output (see 'dlv help log')
-      --only-same-user       Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
-      --wd string            Working directory for running the program.
+      --accept-multiclient               Allows a headless server to accept multiple client connections.
+      --allow-non-terminal-interactive   Allows interactive sessions of Delve that don't have a terminal as stdin, stdout and stderr
+      --api-version int                  Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
+      --backend string                   Backend selection (see 'dlv help backend'). (default "default")
+      --build-flags string               Build flags, to be passed to the compiler.
+      --check-go-version                 Checks that the version of Go in use is compatible with Delve. (default true)
+      --headless                         Run debug server only, in headless mode.
+      --init string                      Init file, executed by the terminal client.
+  -l, --listen string                    Debugging server listen address. (default "127.0.0.1:0")
+      --log                              Enable debugging server logging.
+      --log-dest string                  Writes logs to the specified file or file descriptor (see 'dlv help log').
+      --log-output string                Comma separated list of components that should produce debug output (see 'dlv help log')
+      --only-same-user                   Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
+  -r, --redirect stringArray             Specifies redirect rules for target process (see 'dlv help redirect')
+      --wd string                        Working directory for running the program.
 ```
 
 ### SEE ALSO

Documentation/usage/dlv_attach.md

@@ -25,19 +25,21 @@ dlv attach pid [executable]
 ### Options inherited from parent commands
 
 ```
-      --accept-multiclient   Allows a headless server to accept multiple client connections.
-      --api-version int      Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
-      --backend string       Backend selection (see 'dlv help backend'). (default "default")
-      --build-flags string   Build flags, to be passed to the compiler.
-      --check-go-version     Checks that the version of Go in use is compatible with Delve. (default true)
-      --headless             Run debug server only, in headless mode.
-      --init string          Init file, executed by the terminal client.
-  -l, --listen string        Debugging server listen address. (default "127.0.0.1:0")
-      --log                  Enable debugging server logging.
-      --log-dest string      Writes logs to the specified file or file descriptor (see 'dlv help log').
-      --log-output string    Comma separated list of components that should produce debug output (see 'dlv help log')
-      --only-same-user       Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
-      --wd string            Working directory for running the program.
+      --accept-multiclient               Allows a headless server to accept multiple client connections.
+      --allow-non-terminal-interactive   Allows interactive sessions of Delve that don't have a terminal as stdin, stdout and stderr
+      --api-version int                  Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
+      --backend string                   Backend selection (see 'dlv help backend'). (default "default")
+      --build-flags string               Build flags, to be passed to the compiler.
+      --check-go-version                 Checks that the version of Go in use is compatible with Delve. (default true)
+      --headless                         Run debug server only, in headless mode.
+      --init string                      Init file, executed by the terminal client.
+  -l, --listen string                    Debugging server listen address. (default "127.0.0.1:0")
+      --log                              Enable debugging server logging.
+      --log-dest string                  Writes logs to the specified file or file descriptor (see 'dlv help log').
+      --log-output string                Comma separated list of components that should produce debug output (see 'dlv help log')
+      --only-same-user                   Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
+  -r, --redirect stringArray             Specifies redirect rules for target process (see 'dlv help redirect')
+      --wd string                        Working directory for running the program.
 ```
 
 ### SEE ALSO

Documentation/usage/dlv_backend.md

@@ -18,19 +18,21 @@ are:
 ### Options inherited from parent commands
 
 ```
-      --accept-multiclient   Allows a headless server to accept multiple client connections.
-      --api-version int      Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
-      --backend string       Backend selection (see 'dlv help backend'). (default "default")
-      --build-flags string   Build flags, to be passed to the compiler.
-      --check-go-version     Checks that the version of Go in use is compatible with Delve. (default true)
-      --headless             Run debug server only, in headless mode.
-      --init string          Init file, executed by the terminal client.
-  -l, --listen string        Debugging server listen address. (default "127.0.0.1:0")
-      --log                  Enable debugging server logging.
-      --log-dest string      Writes logs to the specified file or file descriptor (see 'dlv help log').
-      --log-output string    Comma separated list of components that should produce debug output (see 'dlv help log')
-      --only-same-user       Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
-      --wd string            Working directory for running the program.
+      --accept-multiclient               Allows a headless server to accept multiple client connections.
+      --allow-non-terminal-interactive   Allows interactive sessions of Delve that don't have a terminal as stdin, stdout and stderr
+      --api-version int                  Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
+      --backend string                   Backend selection (see 'dlv help backend'). (default "default")
+      --build-flags string               Build flags, to be passed to the compiler.
+      --check-go-version                 Checks that the version of Go in use is compatible with Delve. (default true)
+      --headless                         Run debug server only, in headless mode.
+      --init string                      Init file, executed by the terminal client.
+  -l, --listen string                    Debugging server listen address. (default "127.0.0.1:0")
+      --log                              Enable debugging server logging.
+      --log-dest string                  Writes logs to the specified file or file descriptor (see 'dlv help log').
+      --log-output string                Comma separated list of components that should produce debug output (see 'dlv help log')
+      --only-same-user                   Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
+  -r, --redirect stringArray             Specifies redirect rules for target process (see 'dlv help redirect')
+      --wd string                        Working directory for running the program.
 ```
 
 ### SEE ALSO

Documentation/usage/dlv_connect.md

@@ -14,19 +14,21 @@ dlv connect addr
 ### Options inherited from parent commands
 
 ```
-      --accept-multiclient   Allows a headless server to accept multiple client connections.
-      --api-version int      Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
-      --backend string       Backend selection (see 'dlv help backend'). (default "default")
-      --build-flags string   Build flags, to be passed to the compiler.
-      --check-go-version     Checks that the version of Go in use is compatible with Delve. (default true)
-      --headless             Run debug server only, in headless mode.
-      --init string          Init file, executed by the terminal client.
-  -l, --listen string        Debugging server listen address. (default "127.0.0.1:0")
-      --log                  Enable debugging server logging.
-      --log-dest string      Writes logs to the specified file or file descriptor (see 'dlv help log').
-      --log-output string    Comma separated list of components that should produce debug output (see 'dlv help log')
-      --only-same-user       Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
-      --wd string            Working directory for running the program.
+      --accept-multiclient               Allows a headless server to accept multiple client connections.
+      --allow-non-terminal-interactive   Allows interactive sessions of Delve that don't have a terminal as stdin, stdout and stderr
+      --api-version int                  Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
+      --backend string                   Backend selection (see 'dlv help backend'). (default "default")
+      --build-flags string               Build flags, to be passed to the compiler.
+      --check-go-version                 Checks that the version of Go in use is compatible with Delve. (default true)
+      --headless                         Run debug server only, in headless mode.
+      --init string                      Init file, executed by the terminal client.
+  -l, --listen string                    Debugging server listen address. (default "127.0.0.1:0")
+      --log                              Enable debugging server logging.
+      --log-dest string                  Writes logs to the specified file or file descriptor (see 'dlv help log').
+      --log-output string                Comma separated list of components that should produce debug output (see 'dlv help log')
+      --only-same-user                   Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
+  -r, --redirect stringArray             Specifies redirect rules for target process (see 'dlv help redirect')
+      --wd string                        Working directory for running the program.
 ```
 
 ### SEE ALSO

Documentation/usage/dlv_core.md

@@ -20,19 +20,21 @@ dlv core <executable> <core>
 ### Options inherited from parent commands
 
 ```
-      --accept-multiclient   Allows a headless server to accept multiple client connections.
-      --api-version int      Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
-      --backend string       Backend selection (see 'dlv help backend'). (default "default")
-      --build-flags string   Build flags, to be passed to the compiler.
-      --check-go-version     Checks that the version of Go in use is compatible with Delve. (default true)
-      --headless             Run debug server only, in headless mode.
-      --init string          Init file, executed by the terminal client.
-  -l, --listen string        Debugging server listen address. (default "127.0.0.1:0")
-      --log                  Enable debugging server logging.
-      --log-dest string      Writes logs to the specified file or file descriptor (see 'dlv help log').
-      --log-output string    Comma separated list of components that should produce debug output (see 'dlv help log')
-      --only-same-user       Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
-      --wd string            Working directory for running the program.
+      --accept-multiclient               Allows a headless server to accept multiple client connections.
+      --allow-non-terminal-interactive   Allows interactive sessions of Delve that don't have a terminal as stdin, stdout and stderr
+      --api-version int                  Selects API version when headless. New clients should use v2. Can be reset via RPCServer.SetApiVersion. See Documentation/api/json-rpc/README.md. (default 1)
+      --backend string                   Backend selection (see 'dlv help backend'). (default "default")
+      --build-flags string               Build flags, to be passed to the compiler.
+      --check-go-version                 Checks that the version of Go in use is compatible with Delve. (default true)
+      --headless                         Run debug server only, in headless mode.
+      --init string                      Init file, executed by the terminal client.
+  -l, --listen string                    Debugging server listen address. (default "127.0.0.1:0")
+      --log                              Enable debugging server logging.
+      --log-dest string                  Writes logs to the specified file or file descriptor (see 'dlv help log').
+      --log-output string                Comma separated list of components that should produce debug output (see 'dlv help log')
+      --only-same-user                   Only connections from the same user that started this instance of Delve are allowed to connect. (default true)
+  -r, --redirect stringArray             Specifies redirect rules for target process (see 'dlv help redirect')
+      --wd string                        Working directory for running the program.
 ```
 
 ### SEE ALSO