diff --git a/Cargo.lock b/Cargo.lock
index 8b2e9b5..7ca8c12 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -24,7 +24,7 @@ version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "hermit-abi 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -91,7 +91,7 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "boxfnonce 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -115,7 +115,7 @@ version = "0.6.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -127,7 +127,7 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasi 0.9.0+wasi-snapshot-preview1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -144,7 +144,7 @@ name = "hermit-abi"
 version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -199,7 +199,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.76"
+version = "0.2.77"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -238,7 +238,7 @@ dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -250,7 +250,7 @@ dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -274,7 +274,7 @@ name = "privdrop"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.16.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -329,7 +329,7 @@ version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -379,7 +379,7 @@ version = "0.16.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.58 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "once_cell 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "spin 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -464,7 +464,7 @@ name = "signal"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.14.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -584,7 +584,7 @@ version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.57 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -605,7 +605,7 @@ version = "0.2.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "const_fn 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "standback 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "stdweb 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "time-macros 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -707,7 +707,7 @@ dependencies = [
  "daemonize 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "igd 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "privdrop 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -853,7 +853,7 @@ dependencies = [
 "checksum itoa 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "dc6f3ad7b9d11a0c00842ff8de1b60ee58661048eb8049ed33c73594f359d7e6"
 "checksum js-sys 0.3.41 (registry+https://github.com/rust-lang/crates.io-index)" = "c4b9172132a62451e56142bff9afc91c8e4a4500aa5b847da36815b63bfda916"
 "checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
-"checksum libc 0.2.76 (registry+https://github.com/rust-lang/crates.io-index)" = "755456fae044e6fa1ebbbd1b3e902ae19e73097ed4ed87bb79934a867c007bc3"
+"checksum libc 0.2.77 (registry+https://github.com/rust-lang/crates.io-index)" = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
 "checksum linked-hash-map 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8dd5a6d5999d9907cda8ed67bbd137d3af8085216c2ac62de5be860bd41f304a"
 "checksum log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)" = "4fabed175da42fed1fa0746b0ea71f412aa9d35e76e95e59b192c64b9dc2bf8b"
 "checksum loom 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4ecc775857611e1df29abba5c41355cdf540e7e9d4acfdf0f355eefee82330b7"