Change in flashrom[master]: CHROMIUM: flashrom_tester: Drop nix dependency

[Edward O'Callaghan (Code Review)]

Edward O'Callaghan has submitted this change. ( https://review.coreboot.org/c/flashrom/+/52889 )

Change subject: CHROMIUM: flashrom_tester: Drop nix dependency
......................................................................

CHROMIUM: flashrom_tester: Drop nix dependency

We can just use the libc functions directly. This is exactly what nix
does anyway.

BUG=none
TEST=unit tests
BRANCH=none

Original-Change-Id: I45c02f0c71d164bd8f504fe2b8d3acd54e0d5704
Original-Signed-off-by: Chirantan Ekbote 
Original-Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+...
Original-Reviewed-by: Edward O'Callaghan 
Original-Reviewed-by: Allen Webb 
Original-Commit-Queue: Allen Webb 
(cherry picked from commit 1ba7dbe83e01d270b6d8d597a079ea3bfeb2117e)
Change-Id: Iea61c65efb04da9cd0bc0bd85a34fc10912ea87b
Reviewed-on: https://review.coreboot.org/c/flashrom/+/52889
Tested-by: build bot (Jenkins) 
Reviewed-by: Peter Marheine 
Reviewed-by: Edward O'Callaghan 
---
M util/flashrom_tester/Cargo.toml
M util/flashrom_tester/src/main.rs
2 files changed, 13 insertions(+), 7 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Edward O'Callaghan: Looks good to me, approved
  Peter Marheine: Looks good to me, but someone else must approve

diff --git a/util/flashrom_tester/Cargo.toml b/util/flashrom_tester/Cargo.toml
index 0898d3c..e7a5820 100644
--- a/util/flashrom_tester/Cargo.toml
+++ b/util/flashrom_tester/Cargo.toml
@@ -18,8 +18,8 @@
 chrono = { version = "0.4", optional = true }
 clap = { version = "2.33", default-features = false, optional = true }
 flashrom = { path = "flashrom/" }
+libc = "0.2"
 log = { version = "0.4", features = ["std"] }
-nix = "0.14.1"
 rand = "0.6.4"
 serde_json = "1"
 sys-info = "0.5.7"
diff --git a/util/flashrom_tester/src/main.rs b/util/flashrom_tester/src/main.rs
index e589ee1..80484d2 100644
--- a/util/flashrom_tester/src/main.rs
+++ b/util/flashrom_tester/src/main.rs
@@ -152,12 +152,11 @@
 /// Once a signal is trapped, the default behavior is restored (terminating
 /// the process) for future signals.
 fn handle_sigint() -> &'static AtomicBool {
-    use nix::libc::c_int;
-    use nix::sys::signal::{self, SigHandler, Signal};
+    use libc::c_int;
     use std::sync::atomic::Ordering;

unsafe {
-        let _ = signal::signal(Signal::SIGINT, SigHandler::Handler(sigint_handler));
+        let _ = libc::signal(libc::SIGINT, sigint_handler as libc::sighandler_t);
     }
     static TERMINATE_FLAG: AtomicBool = AtomicBool::new(false);

@@ -169,10 +168,17 @@
 test, or press ^C again to exit immediately (possibly bricking your machine).
 ";

-        // Use raw write() because signal-safety is a very hard problem
-        let _ = nix::unistd::write(STDERR_FILENO, MESSAGE);
+        // Use raw write() because signal-safety is a very hard problem. Safe because this doesn't
+        // modify any memory.
+        let _ = unsafe {
+            libc::write(
+                STDERR_FILENO,
+                MESSAGE.as_ptr() as *const libc::c_void,
+                MESSAGE.len() as libc::size_t,
+            )
+        };
         unsafe {
-            let _ = signal::signal(Signal::SIGINT, SigHandler::SigDfl);
+            let _ = libc::signal(libc::SIGINT, libc::SIG_DFL);
         }
         TERMINATE_FLAG.store(true, Ordering::Release);
     }