getppid

src/call.rs

@@ -161,6 +161,11 @@ pub fn getpid() -> Result<usize> {
     unsafe { syscall0(SYS_GETPID) }
 }
 
+/// Get the parent process ID
+pub fn getppid() -> Result<usize> {
+    unsafe { syscall0(SYS_GETPPID) }
+}
+
 /// Get the current user ID
 pub fn getuid() -> Result<usize> {
     unsafe { syscall0(SYS_GETUID) }

src/number.rs

@@ -46,6 +46,7 @@ pub const SYS_GETEUID: usize =  201;
 pub const SYS_GETGID: usize =   200;
 pub const SYS_GETNS: usize =    950;
 pub const SYS_GETPID: usize =   20;
+pub const SYS_GETPPID: usize =  64;
 pub const SYS_GETUID: usize =   199;
 pub const SYS_IOPL: usize =     110;
 pub const SYS_KILL: usize =     37;