Disable SYSEMU functions for musl targets

Author: voidc

src/sys/ptrace/linux.rs

@@ -109,11 +109,11 @@ libc_enum!{
         #[cfg(all(target_os = "linux", not(any(target_arch = "mips",
                                                target_arch = "mips64"))))]
         PTRACE_PEEKSIGINFO,
-        #[cfg(all(target_os = "linux", any(target_arch = "x86",
-                                           target_arch = "x86_64")))]
+        #[cfg(all(target_os = "linux", target_env = "gnu",
+                  any(target_arch = "x86", target_arch = "x86_64")))]
         PTRACE_SYSEMU,
-        #[cfg(all(target_os = "linux", any(target_arch = "x86",
-                                           target_arch = "x86_64")))]
+        #[cfg(all(target_os = "linux", target_env = "gnu",
+                  any(target_arch = "x86", target_arch = "x86_64")))]
         PTRACE_SYSEMU_SINGLESTEP,
     }
 }
@@ -308,7 +308,7 @@ pub fn syscall<T: Into<Option<Signal>>>(pid: Pid, sig: T) -> Result<()> {
 /// In contrast to the `syscall` function, the syscall stopped at will not be executed.
 /// Thus the the tracee will only be stopped once per syscall,
 /// optionally delivering a signal specified by `sig`.
-#[cfg(all(target_os = "linux", any(target_arch = "x86", target_arch = "x86_64")))]
+#[cfg(all(target_os = "linux", target_env = "gnu", any(target_arch = "x86", target_arch = "x86_64")))]
 pub fn sysemu<T: Into<Option<Signal>>>(pid: Pid, sig: T) -> Result<()> {
     let data = match sig.into() {
         Some(s) => s as i32 as *mut c_void,
@@ -431,7 +431,7 @@ pub fn step<T: Into<Option<Signal>>>(pid: Pid, sig: T) -> Result<()> {
 /// Advances the execution by a single step or until the next syscall.
 /// In case the tracee is stopped at a syscall, the syscall will not be executed.
 /// Optionally, the signal specified by `sig` is delivered to the tracee upon continuation.
-#[cfg(all(target_os = "linux", any(target_arch = "x86", target_arch = "x86_64")))]
+#[cfg(all(target_os = "linux", target_env = "gnu", any(target_arch = "x86", target_arch = "x86_64")))]
 pub fn step_or_sysemu<T: Into<Option<Signal>>>(pid: Pid, sig: T) -> Result<()> {
     let data = match sig.into() {
         Some(s) => s as i32 as *mut c_void,