Add portability infrastructure

11 files changed, 112 insertions, 48 deletions

diff --git a/src/include-local/os.h b/src/include-local/os.h
new file mode 100644
index 0000000..72062e9
--- /dev/null
+++ b/src/include-local/os.h
@@ -0,0 +1,11 @@
+/* ISC license. */
+
+#ifndef S6_LINUX_INIT_OS_H
+#define S6_LINUX_INIT_OS_H
+
+extern void os_reboot (int) ;
+extern void os_kbspecials (int) ;
+extern void os_mount_tmpfs (char const *, unsigned int) ;
+extern int os_mount_devtmpfs (char const *) ;
+
+#endif
diff --git a/src/init/deps-exe/s6-linux-init b/src/init/deps-exe/s6-linux-init
index e7187fe..78c08eb 100644
--- a/src/init/deps-exe/s6-linux-init
+++ b/src/init/deps-exe/s6-linux-init
@@ -1 +1,2 @@
+libos-${OS}.a.xyzzy
 -lskarnet
diff --git a/src/init/s6-linux-init.c b/src/init/s6-linux-init.c
index 9e2d86e..c868884 100644
--- a/src/init/s6-linux-init.c
+++ b/src/init/s6-linux-init.c
@@ -7,11 +7,6 @@
 #include <errno.h>
 #include <signal.h>
 #include <sys/stat.h>
-#include <sys/mount.h>
-#include <sys/reboot.h>
-#include <sys/ioctl.h>
-
-#include <linux/kd.h>
 
 #include <skalibs/types.h>
 #include <skalibs/allreadwrite.h>
@@ -26,6 +21,7 @@
 #include <s6/config.h>
 
 #include <s6-linux-init/config.h>
+#include "os.h"
 #include "defaults.h"
 #include "initctl.h"
 
@@ -67,25 +63,6 @@ static inline void wait_for_notif (int fd)
   close(fd) ;
 }
 
-static void kbspecials (void)
-{
-  int fd ;
-  if (inns) return ;
-  fd = open("/dev/tty0", O_RDONLY | O_NOCTTY) ;
-  if (fd < 0)
-    strerr_warnwu2sys("open /dev/", "tty0 (kbrequest will not be handled)") ;
-  else
-  {
-    if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
-      strerr_warnwu2sys("ioctl KDSIGACCEPT on ", "tty0 (kbrequest will not be handled)") ;
-    close(fd) ;
-  }
-
-  sig_block(SIGINT) ; /* don't panic on early cad before s6-svscan catches it */
-  if (reboot(RB_DISABLE_CAD) == -1)
-    strerr_warnwu1sys("trap ctrl-alt-del") ;
-}
-
 static inline void run_stage2 (char const *basedir, char const **argv, unsigned int argc, char const *const *envp, size_t envlen, char const *modifs, size_t modiflen, char const *initdefault)
 {
   size_t dirlen = strlen(basedir) ;
@@ -185,7 +162,7 @@ int main (int argc, char const **argv, char const *const *envp)
     close(1) ;
     close(2) ;
    /* at this point we're totally in the dark, hoping /dev/console will work */
-    nope = mount("dev", slashdev, "devtmpfs", MS_NOSUID | MS_NOEXEC, "") < 0 ;
+    nope = os_mount_devtmpfs(slashdev) < 0 ;
     e = errno ;
     if (open("/dev/console", O_WRONLY)
      || fd_move(2, 0) < 0
@@ -206,24 +183,7 @@ int main (int argc, char const **argv, char const *const *envp)
     if (fd_move(0, p[0]) < 0) strerr_diefu1sys(111, "fd_move to stdin") ;
   }
 
-  if (mounttype)
-  {
-    if (mounttype == 2)
-    {
-      if (mount("tmpfs", S6_LINUX_INIT_TMPFS, "tmpfs", MS_REMOUNT | MS_NODEV | MS_NOSUID, "mode=0755") == -1)
-        strerr_diefu1sys(111, "remount " S6_LINUX_INIT_TMPFS) ;
-    }
-    else
-    {
-      if (umount(S6_LINUX_INIT_TMPFS) == -1)
-      {
-        if (errno != EINVAL)
-          strerr_warnwu1sys("umount " S6_LINUX_INIT_TMPFS) ;
-      }
-      if (mount("tmpfs", S6_LINUX_INIT_TMPFS, "tmpfs", MS_NODEV | MS_NOSUID, "mode=0755") == -1)
-        strerr_diefu1sys(111, "mount tmpfs on " S6_LINUX_INIT_TMPFS) ;
-    }
-  }
+  os_mount_tmpfs(S6_LINUX_INIT_TMPFS, mounttype) ;
 
   {
     size_t dirlen = strlen(basedir) ;
@@ -273,7 +233,7 @@ int main (int argc, char const **argv, char const *const *envp)
       close(notifpipe[0]) ;
       fmtfd[1] = 'd' ;
       fmtfd[2 + uint_fmt(fmtfd + 2, notifpipe[1])] = 0 ;
-      kbspecials() ;
+      os_kbspecials(inns) ;
     }
     else
     {
@@ -281,7 +241,7 @@ int main (int argc, char const **argv, char const *const *envp)
       if (fd < 0) strerr_diefu1sys(111, "dup stderr") ;
       fmtfd[1] = 'X' ;
       fmtfd[2 + uint_fmt(fmtfd + 2, (unsigned int)fd)] = 0 ;
-      kbspecials() ;
+      os_kbspecials(inns) ;
       if (fd_copy(2, 1) == -1)
         strerr_diefu1sys(111, "redirect output file descriptor") ;
     }
diff --git a/src/os/deps-lib/os-freebsd b/src/os/deps-lib/os-freebsd
new file mode 100644
index 0000000..a8c2a99
--- /dev/null
+++ b/src/os/deps-lib/os-freebsd
@@ -0,0 +1,3 @@
+freebsd-os_reboot.o
+freebsd-os_kbspecials.o
+freebsd-os_mount_tmpfs.o
diff --git a/src/os/deps-lib/os-linux b/src/os/deps-lib/os-linux
new file mode 100644
index 0000000..56fe3fc
--- /dev/null
+++ b/src/os/deps-lib/os-linux
@@ -0,0 +1,4 @@
+linux-os_reboot.o
+linux-os_kbspecials.o
+linux-os_mount_devtmpfs.o
+linux-os_mount_tmpfs.o
diff --git a/src/os/linux-os_kbspecials.c b/src/os/linux-os_kbspecials.c
new file mode 100644
index 0000000..0d407ab
--- /dev/null
+++ b/src/os/linux-os_kbspecials.c
@@ -0,0 +1,33 @@
+/* ISC license. */
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <sys/reboot.h>
+#include <sys/ioctl.h>
+#include <linux/kd.h>
+
+#include <skalibs/strerr2.h>
+#include <skalibs/sig.h>
+
+#include "os.h"
+
+void os_kbspecials (int inns)
+{
+  int fd ;
+  if (inns) return ;
+  fd = open("/dev/tty0", O_RDONLY | O_NOCTTY) ;
+  if (fd < 0)
+    strerr_warnwu2sys("open /dev/", "tty0 (kbrequest will not be handled)") ;
+  else
+  {
+    if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
+      strerr_warnwu2sys("ioctl KDSIGACCEPT on ", "tty0 (kbrequest will not be handled)") ;
+    close(fd) ;
+  }
+
+  sig_block(SIGINT) ; /* don't panic on early cad before s6-svscan catches it */
+  if (reboot(RB_DISABLE_CAD) == -1)
+    strerr_warnwu1sys("trap ctrl-alt-del") ;
+}
diff --git a/src/os/linux-os_mount_devtmpfs.c b/src/os/linux-os_mount_devtmpfs.c
new file mode 100644
index 0000000..b3f34a1
--- /dev/null
+++ b/src/os/linux-os_mount_devtmpfs.c
@@ -0,0 +1,10 @@
+/* ISC license. */
+
+#include <sys/mount.h>
+
+#include "os.h"
+
+int os_mount_devtmpfs (char const *point)
+{
+  return mount("dev", point, "devtmpfs", MS_NOSUID | MS_NOEXEC, "") ;
+}
diff --git a/src/os/linux-os_mount_tmpfs.c b/src/os/linux-os_mount_tmpfs.c
new file mode 100644
index 0000000..0e173d0
--- /dev/null
+++ b/src/os/linux-os_mount_tmpfs.c
@@ -0,0 +1,31 @@
+/* ISC license. */
+
+#include <errno.h>
+
+#include <sys/mount.h>
+
+#include <skalibs/strerr2.h>
+
+#include "os.h"
+
+void os_mount_tmpfs (char const *point, unsigned int mounttype)
+{
+  if (mounttype)
+  {
+    if (mounttype == 2)
+    {
+      if (mount("tmpfs", point, "tmpfs", MS_REMOUNT | MS_NODEV | MS_NOSUID, "mode=0755") == -1)
+        strerr_diefu2sys(111, "remount ", point) ;
+    }
+    else
+    {
+      if (umount(point) == -1)
+      {
+        if (errno != EINVAL)
+          strerr_warnwu2sys("umount ", point) ;
+      }
+      if (mount("tmpfs", point, "tmpfs", MS_NODEV | MS_NOSUID, "mode=0755") == -1)
+        strerr_diefu2sys(111, "mount tmpfs on ", point) ;
+    }
+  }
+}
diff --git a/src/os/linux-os_reboot.c b/src/os/linux-os_reboot.c
new file mode 100644
index 0000000..fb41584
--- /dev/null
+++ b/src/os/linux-os_reboot.c
@@ -0,0 +1,10 @@
+/* ISC license. */
+
+#include <sys/reboot.h>
+
+#include "os.h"
+
+void os_reboot (int what)
+{
+  reboot(what == 3 ? RB_AUTOBOOT : what == 2 ? RB_POWER_OFF : RB_HALT_SYSTEM) ;
+}
diff --git a/src/shutdown/deps-exe/s6-linux-init-hpr b/src/shutdown/deps-exe/s6-linux-init-hpr
index 454a027..e556641 100644
--- a/src/shutdown/deps-exe/s6-linux-init-hpr
+++ b/src/shutdown/deps-exe/s6-linux-init-hpr
@@ -1,4 +1,5 @@
 libhpr.a.xyzzy
+libos-${OS}.a.xyzzy
 ${LIBUTMPS}
 -lskarnet
 ${SYSCLOCK_LIB}
diff --git a/src/shutdown/s6-linux-init-hpr.c b/src/shutdown/s6-linux-init-hpr.c
index a874ac3..c92717c 100644
--- a/src/shutdown/s6-linux-init-hpr.c
+++ b/src/shutdown/s6-linux-init-hpr.c
@@ -6,7 +6,6 @@
 #include <signal.h>
 #include <errno.h>
 #include <utmpx.h>
-#include <sys/reboot.h>
 
 #include <skalibs/strerr2.h>
 #include <skalibs/sgetopt.h>
@@ -14,6 +13,7 @@
 #include <skalibs/tai.h>
 #include <skalibs/djbunix.h>
 
+#include "os.h"
 #include "defaults.h"
 #include "hpr.h"
 
@@ -82,8 +82,8 @@ int main (int argc, char const *const *argv)
   if (force)
   {
     if (dosync) sync() ;
-    reboot(what == 3 ? RB_AUTOBOOT : what == 2 ? RB_POWER_OFF : RB_HALT_SYSTEM) ;
-    strerr_diefu1sys(111, "reboot()") ;
+    os_reboot(what) ;
+    strerr_diefu1sys(111, "os_reboot") ;
   }
 
   if (!tain_now_g()) strerr_warnw1sys("get current time") ;