Add support for setjmp/longjmp on x86_64.

Author: jeff-davis-aster

src/unix/notbsd/linux/mod.rs

@@ -655,6 +655,22 @@ s! {
         pub updated: ::c_ulong,
         pub ha: [::c_uchar; ::MAX_ADDR_LEN],
     }
+
+    #[cfg(target_arch="x86_64")]
+    #[repr(C)]
+    pub struct jmp_buf {
+        __jmpbuf: [i64; 8],
+        __mask_was_saved: ::c_int,
+        __saved_mask: ::sigset_t,
+    }
+
+    #[cfg(target_arch="x86_64")]
+    #[repr(C)]
+    pub struct sigjmp_buf {
+        __jmpbuf: [i64; 8],
+        __mask_was_saved: ::c_int,
+        __saved_mask: ::sigset_t,
+    }
 }
 
 pub const ABDAY_1: ::nl_item = 0x20000;
@@ -2259,6 +2275,17 @@ extern {
         nobj: ::size_t,
         stream: *mut ::FILE
     ) -> ::size_t;
+
+    #[cfg(target_arch="x86_64")]
+    pub fn setjmp(env: *mut ::jmp_buf) -> ::c_int;
+    #[cfg(target_arch="x86_64")]
+    #[link_name="__sigsetjmp"]
+    #[cfg(target_arch="x86_64")]
+    pub fn sigsetjmp(env: *mut ::sigjmp_buf, savesigs: ::c_int) -> ::c_int;
+    #[cfg(target_arch="x86_64")]
+    pub fn longjmp(env: *mut ::jmp_buf, val: ::c_int);
+    #[cfg(target_arch="x86_64")]
+    pub fn siglongjmp(env: *mut ::sigjmp_buf, val: ::c_int);
 }
 
 cfg_if! {