about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/powerpc/powerpc32
diff options
context:
space:
mode:
authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2020-06-30 09:20:48 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2020-07-09 12:05:40 -0300
commit3283f711132eaadc4f04bd8c1d84c910c29ba066 (patch)
treee9cd65cd30a76935b035f9921517013b203021eb /sysdeps/unix/sysv/linux/powerpc/powerpc32
parent915b9fe3124d87ff1734c902c0d36b5eac7688ff (diff)
downloadglibc-3283f711132eaadc4f04bd8c1d84c910c29ba066.tar.gz
glibc-3283f711132eaadc4f04bd8c1d84c910c29ba066.tar.xz
glibc-3283f711132eaadc4f04bd8c1d84c910c29ba066.zip
sysv: linux: Add 64-bit time_t variant for msgctl
To provide a y2038 safe interface a new symbol __msgctl64 is added
and __msgctl is change to call it instead (it adds some extra buffer
coping for the 32 bit time_t implementation).

Two new structures are added:

  1. kernel_msqid64_ds: used internally only on 32-bit architectures
     to issue the syscall.  A handful of architectures (hppa, i386, mips,
     powerpc32, and sparc32) require specific implementations due to
     their kernel ABI.

  2. msqid_ds64: this is only for __TIMESIZE != 64 to use along with
     the 64-bit msgctl.  It is different than the kernel struct because
     the exported 64-bit time_t might require different alignment
     depending on the architecture ABI.

So the resulting implementation does:

  1. For 64-bit architectures it assumes msqid_ds already contains
     64-bit time_t fields and will result in just the __msgctl symbol
     using the __msgctl64 code.  The msgid_ds argument is passed as-is
     to the syscall.

  2. For 32-bit architectures with default 64-bit time_t (newer ABIs
     such riscv32 or arc), it will also result in only one exported
     symbol but with the required high/low time handling.

  3. Finally for 32-bit architecture with both 32-bit and 64-bit time_t
     support we follow the already set way to provide one symbol with
     64-bit time_t support and implement the 32-bit time_t support using
     the 64-bit time_t.

     The default 32-bit symbol will allocate and copy the msqid_ds
     over multiple buffers, but this should be deprecated in favor
     of the __msgctl64 anyway.

Checked on i686-linux-gnu and x86_64-linux-gnu.  I also did some sniff
tests on powerpc, powerpc64, mips, mips64, armhf, sparcv9, and
sparc64.

Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Tested-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/powerpc32')
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/powerpc32/struct_kernel_msqid64_ds.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/struct_kernel_msqid64_ds.h b/sysdeps/unix/sysv/linux/powerpc/powerpc32/struct_kernel_msqid64_ds.h
new file mode 100644
index 0000000000..69a63ee27a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/struct_kernel_msqid64_ds.h
@@ -0,0 +1,18 @@
+/* Analogous to kernel struct msqid64_ds used on msgctl.  */
+struct kernel_msqid64_ds
+{
+  struct ipc_perm msg_perm;
+  unsigned long msg_stime_high;
+  unsigned long msg_stime;
+  unsigned long msg_rtime_high;
+  unsigned long msg_rtime;
+  unsigned long msg_ctime_high;
+  unsigned long msg_ctime;
+  unsigned long msg_cbytes;
+  unsigned long msg_qnum;
+  unsigned long msg_qbytes;
+  __pid_t msg_lspid;
+  __pid_t msg_lrpid;
+  unsigned long __unused1;
+  unsigned long __unused2;
+};