diff --git a/Cargo.lock b/Cargo.lock
index 0fb679df4..4765ff677 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -46,7 +46,7 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "termion 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -64,7 +64,7 @@ dependencies = [
  "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -75,7 +75,7 @@ version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -190,7 +190,7 @@ dependencies = [
 name = "chmod"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "walker 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -227,7 +227,7 @@ dependencies = [
 name = "cksum"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -294,7 +294,7 @@ name = "comm"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -307,7 +307,7 @@ dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "ioctl-sys 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -430,7 +430,7 @@ dependencies = [
 name = "dirname"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -459,7 +459,7 @@ name = "env"
 version = "0.0.1"
 dependencies = [
  "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rust-ini 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -485,7 +485,7 @@ dependencies = [
 name = "expr"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "onig 4.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -536,7 +536,7 @@ version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -544,7 +544,7 @@ dependencies = [
 name = "fmt"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -607,7 +607,7 @@ dependencies = [
  "digest 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "md5 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -621,7 +621,7 @@ dependencies = [
 name = "head"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -634,7 +634,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "hostid"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -643,7 +643,7 @@ name = "hostname"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -675,7 +675,7 @@ name = "install"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -719,7 +719,7 @@ dependencies = [
 name = "kill"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -730,7 +730,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.54"
+version = "0.2.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -739,7 +739,7 @@ version = "0.0.1"
 dependencies = [
  "cpp 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cpp_build 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -747,7 +747,7 @@ dependencies = [
 name = "link"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -755,7 +755,7 @@ dependencies = [
 name = "ln"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -763,7 +763,7 @@ dependencies = [
 name = "logname"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -796,7 +796,7 @@ name = "memchr"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -809,7 +809,7 @@ name = "mkdir"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -818,7 +818,7 @@ name = "mkfifo"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -827,7 +827,7 @@ name = "mknod"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -865,7 +865,7 @@ name = "nice"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -876,7 +876,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -888,7 +888,7 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -898,7 +898,7 @@ version = "0.0.1"
 dependencies = [
  "aho-corasick 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -915,7 +915,7 @@ name = "nohup"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -924,7 +924,7 @@ name = "nproc"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -947,7 +947,7 @@ name = "num_cpus"
 version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -978,7 +978,7 @@ dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "half 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -989,7 +989,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "onig_sys 69.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1015,7 +1015,7 @@ name = "pathchk"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1041,7 +1041,7 @@ name = "platform-info"
 version = "0.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1075,7 +1075,7 @@ version = "0.0.1"
 dependencies = [
  "aho-corasick 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1127,7 +1127,7 @@ name = "rand"
 version = "0.3.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1137,7 +1137,7 @@ version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1150,7 +1150,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1161,7 +1161,7 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1216,7 +1216,7 @@ name = "rand_jitter"
 version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1228,7 +1228,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1264,7 +1264,7 @@ name = "readlink"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1353,7 +1353,7 @@ name = "rust-users"
 version = "0.6.0"
 source = "git+https://github.com/uutils/rust-users#e64253f2b995e7f1a458c68a7eca66e0171d183a"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1463,7 +1463,7 @@ version = "0.0.1"
 dependencies = [
  "filetime 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1557,7 +1557,7 @@ version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1587,7 +1587,7 @@ version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1598,7 +1598,7 @@ name = "tee"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1617,7 +1617,7 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1636,7 +1636,7 @@ name = "termion"
 version = "1.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1649,7 +1649,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "termion 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1658,7 +1658,7 @@ dependencies = [
 name = "test"
 version = "0.0.1"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1684,7 +1684,7 @@ name = "time"
 version = "0.1.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1694,7 +1694,7 @@ name = "timeout"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1755,7 +1755,7 @@ name = "tty"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1837,7 +1837,7 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1845,7 +1845,7 @@ name = "unlink"
 version = "0.0.1"
 dependencies = [
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1891,7 +1891,7 @@ dependencies = [
  "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "getopts 0.2.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "platform-info 0.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "termion 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1939,7 +1939,7 @@ dependencies = [
  "join 0.0.1",
  "kill 0.0.1",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "link 0.0.1",
  "ln 0.0.1",
  "logname 0.0.1",
@@ -2110,7 +2110,7 @@ name = "xattr"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2175,7 +2175,7 @@ dependencies = [
 "checksum itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "501266b7edd0174f8530248f87f99c88fbe60ca4ef3dd486835b8d8d53136f7f"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
 "checksum lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bc5729f27f159ddd61f4df6228e827e86643d4d3e7c32183cb30a1c08f604a14"
-"checksum libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)" = "c6785aa7dd976f5fbf3b71cfd9cd49d7f783c1ff565a858d71031c6c313aa5c6"
+"checksum libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)" = "113dacd5d2dd5dcf7800449b3c3115957db1b6452a4c5bb3447e81087f23e53f"
 "checksum matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 "checksum md5 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "79c56d6a0b07f9e19282511c83fc5b086364cbae4ba8c7d5f190c3d9b0425a48"
 "checksum memchr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "148fab2e51b4f1cfc66da2a7c32981d1d3c083a803978268bb11fe4b86925e7a"
diff --git a/Cargo.toml b/Cargo.toml
index 8c5f497e3..638e16306 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -255,7 +255,7 @@ yes      = { optional=true, path="src/yes" }
 [dev-dependencies]
 time = "0.1.42"
 filetime = "0.2.5"
-libc = "0.2.53"
+libc = "0.2.56"
 regex = "1.0.3"
 rand = "0.6.5"
 tempdir = "0.3.7"