Initial AIX support

Add support to build on AIX operating system. Most of the changes are
in fs part. Since AIX is still tier-3 target, current support is minimal
and does not require passing all tests.

src/uucore/src/lib/features/fs.rs

@@ -111,6 +111,7 @@ impl FileInformation {
         #[cfg(all(
             unix,
             not(target_vendor = "apple"),
+            not(target_os = "aix"),
             not(target_os = "android"),
             not(target_os = "freebsd"),
             not(target_os = "netbsd"),
@@ -142,6 +143,8 @@ impl FileInformation {
             )
         ))]
         return self.0.st_nlink.into();
+        #[cfg(target_os = "aix")]
+        return self.0.st_nlink.try_into().unwrap();
         #[cfg(windows)]
         return self.0.number_of_links();
     }

src/uucore/src/lib/features/fsext.rs

@@ -11,7 +11,7 @@
 const LINUX_MTAB: &str = "/etc/mtab";
 #[cfg(any(target_os = "linux", target_os = "android"))]
 const LINUX_MOUNTINFO: &str = "/proc/self/mountinfo";
-#[cfg(all(unix, not(target_os = "redox")))]
+#[cfg(all(unix, not(any(target_os = "aix", target_os = "redox"))))]
 static MOUNT_OPT_BIND: &str = "bind";
 #[cfg(windows)]
 const MAX_PATH: usize = 266;
@@ -83,6 +83,7 @@ use std::time::UNIX_EPOCH;
 ))]
 pub use libc::statfs as StatFs;
 #[cfg(any(
+    target_os = "aix",
     target_os = "netbsd",
     target_os = "bitrig",
     target_os = "dragonfly",
@@ -101,6 +102,7 @@ pub use libc::statvfs as StatFs;
 ))]
 pub use libc::statfs as statfs_fn;
 #[cfg(any(
+    target_os = "aix",
     target_os = "netbsd",
     target_os = "bitrig",
     target_os = "illumos",
@@ -304,7 +306,7 @@ impl From<StatFs> for MountInfo {
     }
 }
 
-#[cfg(all(unix, not(target_os = "redox")))]
+#[cfg(all(unix, not(any(target_os = "aix", target_os = "redox"))))]
 fn is_dummy_filesystem(fs_type: &str, mount_option: &str) -> bool {
     // spell-checker:disable
     match fs_type {
@@ -323,14 +325,14 @@ fn is_dummy_filesystem(fs_type: &str, mount_option: &str) -> bool {
     // spell-checker:enable
 }
 
-#[cfg(all(unix, not(target_os = "redox")))]
+#[cfg(all(unix, not(any(target_os = "aix", target_os = "redox"))))]
 fn is_remote_filesystem(dev_name: &str, fs_type: &str) -> bool {
     dev_name.find(':').is_some()
         || (dev_name.starts_with("//") && fs_type == "smbfs" || fs_type == "cifs")
         || dev_name == "-hosts"
 }
 
-#[cfg(all(unix, not(target_os = "redox")))]
+#[cfg(all(unix, not(any(target_os = "aix", target_os = "redox"))))]
 fn mount_dev_id(mount_dir: &str) -> String {
     use std::os::unix::fs::MetadataExt;
 
@@ -472,7 +474,12 @@ pub fn read_fs_list() -> Result<Vec<MountInfo>, std::io::Error> {
         }
         Ok(mounts)
     }
-    #[cfg(any(target_os = "redox", target_os = "illumos", target_os = "solaris"))]
+    #[cfg(any(
+        target_os = "aix",
+        target_os = "redox",
+        target_os = "illumos",
+        target_os = "solaris"
+    ))]
     {
         // No method to read mounts, yet
         Ok(Vec::new())
@@ -633,6 +640,7 @@ impl FsMeta for StatFs {
         #[cfg(all(
             not(target_env = "musl"),
             not(target_vendor = "apple"),
+            not(target_os = "aix"),
             not(target_os = "android"),
             not(target_os = "freebsd"),
             not(target_os = "openbsd"),
@@ -658,6 +666,7 @@ impl FsMeta for StatFs {
         return self.f_bsize.into();
         #[cfg(any(
             target_env = "musl",
+            target_os = "aix",
             target_os = "freebsd",
             target_os = "illumos",
             target_os = "solaris",

src/uucore/src/lib/features/signals.rs

@@ -290,6 +290,55 @@ static ALL_SIGNALS: [&str; SIGNALS_SIZE] = [
     "RTMAX",
 ];
 
+/*
+   The following signals are defined in AIX:
+
+   SIGHUP     hangup, generated when terminal disconnects
+   SIGINT     interrupt, generated from terminal special char
+   SIGQUIT    quit, generated from terminal special char
+   SIGILL     illegal instruction (not reset when caught)
+   SIGTRAP    trace trap (not reset when caught)
+   SIGABRT    abort process
+   SIGEMT     EMT intruction
+   SIGFPE     floating point exception
+   SIGKILL    kill (cannot be caught or ignored)
+   SIGBUS     bus error (specification exception)
+   SIGSEGV    segmentation violation
+   SIGSYS     bad argument to system call
+   SIGPIPE    write on a pipe with no one to read it
+   SIGALRM    alarm clock timeout
+   SIGTERM    software termination signal
+   SIGURG     urgent contition on I/O channel
+   SIGSTOP    stop (cannot be caught or ignored)
+   SIGTSTP    interactive stop
+   SIGCONT    continue (cannot be caught or ignored)
+   SIGCHLD    sent to parent on child stop or exit
+   SIGTTIN    background read attempted from control terminal
+   SIGTTOU    background write attempted to control terminal
+   SIGIO      I/O possible, or completed
+   SIGXCPU    cpu time limit exceeded (see setrlimit())
+   SIGXFSZ    file size limit exceeded (see setrlimit())
+   SIGMSG     input data is in the ring buffer
+   SIGWINCH   window size changed
+   SIGPWR     power-fail restart
+   SIGUSR1    user defined signal 1
+   SIGUSR2    user defined signal 2
+   SIGPROF    profiling time alarm (see setitimer)
+   SIGDANGER  system crash imminent; free up some page space
+   SIGVTALRM  virtual time alarm (see setitimer)
+   SIGMIGRATE migrate process
+   SIGPRE     programming exception
+   SIGVIRT    AIX virtual time alarm
+   SIGTALRM   per-thread alarm clock
+*/
+#[cfg(target_os = "aix")]
+pub static ALL_SIGNALS: [&str; 37] = [
+    "HUP", "INT", "QUIT", "ILL", "TRAP", "ABRT", "EMT", "FPE", "KILL", "BUS", "SEGV", "SYS",
+    "PIPE", "ALRM", "TERM", "URG", "STOP", "TSTP", "CONT", "CHLD", "TTIN", "TTOU", "IO", "XCPU",
+    "XFSZ", "MSG", "WINCH", "PWR", "USR1", "USR2", "PROF", "DANGER", "VTALRM", "MIGRATE", "PRE",
+    "VIRT", "TALRM",
+];
+
 pub fn signal_by_name_or_value(signal_name_or_value: &str) -> Option<usize> {
     if let Ok(value) = signal_name_or_value.parse() {
         if is_signal(value) {