Merge changes between r5247 and r5678 from /fsf/trunk.

git-svn-id: svn://svn.eglibc.org/trunk@5679 7b3dc134-2b1b-0410-93df-9e9f96275f8d

11 files changed, 209 insertions, 117 deletions

diff --git a/libc/sysdeps/unix/sysv/linux/adjtime.c b/libc/sysdeps/unix/sysv/linux/adjtime.c
index 202bb1448..ebd214970 100644
--- a/libc/sysdeps/unix/sysv/linux/adjtime.c
+++ b/libc/sysdeps/unix/sysv/linux/adjtime.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1995, 1996, 1997, 1998, 2002, 2004, 2007
+/* Copyright (C) 1995, 1996, 1997, 1998, 2002, 2004, 2007, 2008
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -71,14 +71,16 @@ ADJTIME (const struct TIMEVAL *itv, struct TIMEVAL *otv)
 	  return -1;
 	}
       tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L;
+      tntx.modes = ADJ_OFFSET_SINGLESHOT;
+    }
+  else
+    {
 #ifdef ADJ_OFFSET_SS_READ
       tntx.modes = ADJ_OFFSET_SS_READ;
 #else
-      tntx.modes = ADJ_OFFSET_SINGLESHOT;
+      tntx.modes = 0;
 #endif
     }
-  else
-    tntx.modes = 0;
 
 #if defined ADJ_OFFSET_SS_READ && !defined __ASSUME_ADJ_OFFSET_SS_READ
  again:
diff --git a/libc/sysdeps/unix/sysv/linux/bits/posix_opt.h b/libc/sysdeps/unix/sysv/linux/bits/posix_opt.h
index 1a96db298..37612e0bd 100644
--- a/libc/sysdeps/unix/sysv/linux/bits/posix_opt.h
+++ b/libc/sysdeps/unix/sysv/linux/bits/posix_opt.h
@@ -1,5 +1,6 @@
 /* Define POSIX options for Linux.
-   Copyright (C) 1996,1997,1999,2000,2002,2003 Free Software Foundation, Inc.
+   Copyright (C) 1996,1997,1999,2000,2002,2003,2008
+   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -51,8 +52,8 @@
 /* Setting of memory protections is supported.  */
 #define	_POSIX_MEMORY_PROTECTION	200112L
 
-/* Only root can change owner of file.  */
-#define	_POSIX_CHOWN_RESTRICTED	1
+/* Some filesystems allow all users to change file ownership.  */
+#define	_POSIX_CHOWN_RESTRICTED	0
 
 /* `c_cc' member of 'struct termios' structure can be disabled by
    using the value _POSIX_VDISABLE.  */
diff --git a/libc/sysdeps/unix/sysv/linux/bits/sched.h b/libc/sysdeps/unix/sysv/linux/bits/sched.h
index 5387b9cef..38ba30500 100644
--- a/libc/sysdeps/unix/sysv/linux/bits/sched.h
+++ b/libc/sysdeps/unix/sysv/linux/bits/sched.h
@@ -59,7 +59,12 @@
 				      force CLONE_PTRACE on this clone.  */
 # define CLONE_CHILD_SETTID 0x01000000 /* Store TID in userlevel buffer in
 					  the child.  */
-# define CLONE_STOPPED	0x02000000 /* Start in stopped state.  */
+# define CLONE_NEWUTS	0x04000000	/* New utsname group.  */
+# define CLONE_NEWIPC	0x08000000	/* New ipcs.  */
+# define CLONE_NEWUSER	0x10000000	/* New user namespace.  */
+# define CLONE_NEWPID	0x20000000	/* New pid namespace.  */
+# define CLONE_NEWNET	0x40000000	/* New network namespace.  */
+# define CLONE_IO	0x80000000	/* Clone I/O context.  */
 #endif
 
 /* The official definition.  */
diff --git a/libc/sysdeps/unix/sysv/linux/dl-osinfo.h b/libc/sysdeps/unix/sysv/linux/dl-osinfo.h
index 082790f63..b13b6cf1d 100644
--- a/libc/sysdeps/unix/sysv/linux/dl-osinfo.h
+++ b/libc/sysdeps/unix/sysv/linux/dl-osinfo.h
@@ -1,6 +1,5 @@
 /* Operating system specific code for generic dynamic loader functions.  Linux.
-   Copyright (C) 2000,2001,2002,2004,2005,2006,2007
-	Free Software Foundation, Inc.
+   Copyright (C) 2000-2002,2004-2007,2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -18,9 +17,6 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <string.h>
-#include <fcntl.h>
-#include <sys/utsname.h>
 #include <kernel-features.h>
 #include <dl-sysdep.h>
 #include <stdint.h>
@@ -41,97 +37,6 @@ dl_fatal (const char *str)
 }
 #endif
 
-static inline int __attribute__ ((always_inline))
-_dl_discover_osversion (void)
-{
-#if (defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO) && defined SHARED
-  if (GLRO(dl_sysinfo_map) != NULL)
-    {
-      /* If the kernel-supplied DSO contains a note indicating the kernel's
-	 version, we don't need to call uname or parse any strings.  */
-
-      static const struct
-      {
-	ElfW(Nhdr) hdr;
-	char vendor[8];
-      } expected_note = { { sizeof "Linux", sizeof (ElfW(Word)), 0 }, "Linux" };
-      const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr;
-      const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum;
-      for (uint_fast16_t i = 0; i < phnum; ++i)
-	if (phdr[i].p_type == PT_NOTE)
-	  {
-	    const ElfW(Addr) start = (phdr[i].p_vaddr
-				      + GLRO(dl_sysinfo_map)->l_addr);
-	    const ElfW(Nhdr) *note = (const void *) start;
-	    while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz)
-	      {
-		if (!memcmp (note, &expected_note, sizeof expected_note))
-		  return *(const ElfW(Word) *) ((const void *) note
-						+ sizeof expected_note);
-#define ROUND(len) (((len) + sizeof note->n_type - 1) & -sizeof note->n_type)
-		note = ((const void *) (note + 1)
-			+ ROUND (note->n_namesz) + ROUND (note->n_descsz));
-#undef ROUND
-	      }
-	  }
-    }
-#endif
-
-  char bufmem[64];
-  char *buf = bufmem;
-  unsigned int version;
-  int parts;
-  char *cp;
-  struct utsname uts;
-
-  /* Try the uname system call.  */
-  if (__uname (&uts))
-    {
-      /* This was not successful.  Now try reading the /proc filesystem.  */
-      int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY);
-      if (fd < 0)
-	return -1;
-      ssize_t reslen = __read (fd, bufmem, sizeof (bufmem));
-      __close (fd);
-      if (reslen <= 0)
-	/* This also didn't work.  We give up since we cannot
-	   make sure the library can actually work.  */
-	return -1;
-      buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0';
-    }
-  else
-    buf = uts.release;
-
-  /* Now convert it into a number.  The string consists of at most
-     three parts.  */
-  version = 0;
-  parts = 0;
-  cp = buf;
-  while ((*cp >= '0') && (*cp <= '9'))
-    {
-      unsigned int here = *cp++ - '0';
-
-      while ((*cp >= '0') && (*cp <= '9'))
-	{
-	  here *= 10;
-	  here += *cp++ - '0';
-	}
-
-      ++parts;
-      version <<= 8;
-      version |= here;
-
-      if (*cp++ != '.' || parts == 3)
-	/* Another part following?  */
-	break;
-    }
-
-  if (parts < 3)
-    version <<= 8 * (3 - parts);
-
-  return version;
-}
-
 #define DL_SYSDEP_OSCHECK(FATAL)					      \
   do {									      \
     /* Test whether the kernel is new enough.  This test is only performed    \
diff --git a/libc/sysdeps/unix/sysv/linux/dl-sysdep.c b/libc/sysdeps/unix/sysv/linux/dl-sysdep.c
index 42aec77e8..08ae9aa86 100644
--- a/libc/sysdeps/unix/sysv/linux/dl-sysdep.c
+++ b/libc/sysdeps/unix/sysv/linux/dl-sysdep.c
@@ -1,5 +1,5 @@
 /* Dynamic linker system dependencies for Linux.
-   Copyright (C) 1995,1997,2001,2004,2005,2006 Free Software Foundation, Inc.
+   Copyright (C) 1995,1997,2001,2004,2005,2006, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -20,11 +20,15 @@
 /* Linux needs some special initialization, but otherwise uses
    the generic dynamic linker system interface code.  */
 
+#include <string.h>
+#include <fcntl.h>
 #include <unistd.h>
+#include <sys/utsname.h>
 #include <ldsodefs.h>
 #include <kernel-features.h>
 
-#define DL_SYSDEP_INIT frob_brk ()
+#ifdef SHARED
+# define DL_SYSDEP_INIT frob_brk ()
 
 static inline void
 frob_brk (void)
@@ -53,4 +57,98 @@ frob_brk (void)
 #endif
 }
 
-#include <elf/dl-sysdep.c>
+# include <elf/dl-sysdep.c>
+#endif
+
+
+int
+attribute_hidden
+_dl_discover_osversion (void)
+{
+#if (defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO) && defined SHARED
+  if (GLRO(dl_sysinfo_map) != NULL)
+    {
+      /* If the kernel-supplied DSO contains a note indicating the kernel's
+	 version, we don't need to call uname or parse any strings.  */
+
+      static const struct
+      {
+	ElfW(Nhdr) hdr;
+	char vendor[8];
+      } expected_note = { { sizeof "Linux", sizeof (ElfW(Word)), 0 }, "Linux" };
+      const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr;
+      const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum;
+      for (uint_fast16_t i = 0; i < phnum; ++i)
+	if (phdr[i].p_type == PT_NOTE)
+	  {
+	    const ElfW(Addr) start = (phdr[i].p_vaddr
+				      + GLRO(dl_sysinfo_map)->l_addr);
+	    const ElfW(Nhdr) *note = (const void *) start;
+	    while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz)
+	      {
+		if (!memcmp (note, &expected_note, sizeof expected_note))
+		  return *(const ElfW(Word) *) ((const void *) note
+						+ sizeof expected_note);
+#define ROUND(len) (((len) + sizeof note->n_type - 1) & -sizeof note->n_type)
+		note = ((const void *) (note + 1)
+			+ ROUND (note->n_namesz) + ROUND (note->n_descsz));
+#undef ROUND
+	      }
+	  }
+    }
+#endif
+
+  char bufmem[64];
+  char *buf = bufmem;
+  unsigned int version;
+  int parts;
+  char *cp;
+  struct utsname uts;
+
+  /* Try the uname system call.  */
+  if (__uname (&uts))
+    {
+      /* This was not successful.  Now try reading the /proc filesystem.  */
+      int fd = __open ("/proc/sys/kernel/osrelease", O_RDONLY);
+      if (fd < 0)
+	return -1;
+      ssize_t reslen = __read (fd, bufmem, sizeof (bufmem));
+      __close (fd);
+      if (reslen <= 0)
+	/* This also didn't work.  We give up since we cannot
+	   make sure the library can actually work.  */
+	return -1;
+      buf[MIN (reslen, (ssize_t) sizeof (bufmem) - 1)] = '\0';
+    }
+  else
+    buf = uts.release;
+
+  /* Now convert it into a number.  The string consists of at most
+     three parts.  */
+  version = 0;
+  parts = 0;
+  cp = buf;
+  while ((*cp >= '0') && (*cp <= '9'))
+    {
+      unsigned int here = *cp++ - '0';
+
+      while ((*cp >= '0') && (*cp <= '9'))
+	{
+	  here *= 10;
+	  here += *cp++ - '0';
+	}
+
+      ++parts;
+      version <<= 8;
+      version |= here;
+
+      if (*cp++ != '.' || parts == 3)
+	/* Another part following?  */
+	break;
+    }
+
+  if (parts < 3)
+    version <<= 8 * (3 - parts);
+
+  return version;
+}
diff --git a/libc/sysdeps/unix/sysv/linux/dl-sysdep.h b/libc/sysdeps/unix/sysv/linux/dl-sysdep.h
index becfc8df3..f44fa9814 100644
--- a/libc/sysdeps/unix/sysv/linux/dl-sysdep.h
+++ b/libc/sysdeps/unix/sysv/linux/dl-sysdep.h
@@ -1,5 +1,5 @@
 /* System-specific settings for dynamic linker code.  Linux version.
-   Copyright (C) 2005 Free Software Foundation, Inc.
+   Copyright (C) 2005, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -25,3 +25,12 @@
    we aren't making direct use of it.  So enable this across the board.  */
 
 #define NEED_DL_SYSINFO_DSO	1
+
+
+/* The _dl_discover_osversion function is so far only needed in sysconf
+   to check for kernels later than 2.6.23.  */
+#if !defined __ASSEMBLER__ && __LINUX_KERNEL_VERSION < 0x020617
+/* Get version of the OS.  */
+extern int _dl_discover_osversion (void) attribute_hidden;
+# define HAVE_DL_DISCOVER_OSVERSION	1
+#endif
diff --git a/libc/sysdeps/unix/sysv/linux/fpathconf.c b/libc/sysdeps/unix/sysv/linux/fpathconf.c
index c1cdb1b89..2701c9ec9 100644
--- a/libc/sysdeps/unix/sysv/linux/fpathconf.c
+++ b/libc/sysdeps/unix/sysv/linux/fpathconf.c
@@ -1,5 +1,5 @@
 /* Get file-specific information about descriptor FD.  Linux version.
-   Copyright (C) 1991,1995,1996,1998-2002,2003 Free Software Foundation, Inc.
+   Copyright (C) 1991,1995,1996,1998-2003,2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -45,6 +45,9 @@ __fpathconf (fd, name)
     case _PC_2_SYMLINKS:
       return __statfs_symlinks (__fstatfs (fd, &fsbuf), &fsbuf);
 
+    case _PC_CHOWN_RESTRICTED:
+      return __statfs_chown_restricted (__fstatfs (fd, &fsbuf), &fsbuf);
+
     default:
       return posix_fpathconf (fd, name);
     }
diff --git a/libc/sysdeps/unix/sysv/linux/pathconf.c b/libc/sysdeps/unix/sysv/linux/pathconf.c
index e12a08434..db03529fe 100644
--- a/libc/sysdeps/unix/sysv/linux/pathconf.c
+++ b/libc/sysdeps/unix/sysv/linux/pathconf.c
@@ -1,5 +1,5 @@
 /* Get file-specific information about a file.  Linux version.
-   Copyright (C) 1991,1995,1996,1998-2002,2003 Free Software Foundation, Inc.
+   Copyright (C) 1991,1995,1996,1998-2003,2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -19,8 +19,10 @@
 
 #include <unistd.h>
 #include <errno.h>
+
 #include "pathconf.h"
 #include "linux_fsinfo.h"
+#include <not-cancel.h>
 
 static long int posix_pathconf (const char *file, int name);
 
@@ -46,6 +48,9 @@ __pathconf (const char *file, int name)
     case _PC_2_SYMLINKS:
       return __statfs_symlinks (__statfs (file, &fsbuf), &fsbuf);
 
+    case _PC_CHOWN_RESTRICTED:
+      return __statfs_chown_restricted (__statfs (file, &fsbuf), &fsbuf);
+
     default:
       return posix_pathconf (file, name);
     }
@@ -179,3 +184,44 @@ __statfs_symlinks (int result, const struct statfs *fsbuf)
       return 1;
     }
 }
+
+
+/* Used like: return __statfs_chown_restricted (__statfs (name, &buf), &buf);*/
+long int
+__statfs_chown_restricted (int result, const struct statfs *fsbuf)
+{
+  if (result < 0)
+    {
+      if (errno == ENOSYS)
+	/* Not possible, return the default value.  */
+	return 1;
+
+      /* Some error occured.  */
+      return -1;
+    }
+
+  int fd;
+  long int retval = 1;
+  switch (fsbuf->f_type)
+    {
+    case XFS_SUPER_MAGIC:
+      /* Read the value from /proc/sys/fs/xfs/restrict_chown.  If we cannot
+	 read it default to assume the restriction is in place.  */
+      fd = open_not_cancel_2 ("/proc/sys/fs/xfs/restrict_chown", O_RDONLY);
+      if (fd != -1)
+	{
+	  char buf[2];
+	  if (TEMP_FAILURE_RETRY (read_not_cancel (fd, buf, 2)) == 2
+	      && buf[0] >= '0' && buf[0] <= '1')
+	    retval = buf[0] - '0';
+
+	  close_not_cancel_no_status (fd);
+	}
+      break;
+
+    default:
+      break;
+    }
+
+  return retval;
+}
diff --git a/libc/sysdeps/unix/sysv/linux/pathconf.h b/libc/sysdeps/unix/sysv/linux/pathconf.h
index 20e23685e..806adcc5e 100644
--- a/libc/sysdeps/unix/sysv/linux/pathconf.h
+++ b/libc/sysdeps/unix/sysv/linux/pathconf.h
@@ -1,5 +1,5 @@
 /* Common parts of Linux implementation of pathconf and fpathconf.
-   Copyright (C) 1991,1995,1996,1998-2002,2003 Free Software Foundation, Inc.
+   Copyright (C) 1991,1995,1996,1998-2003,2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -22,13 +22,18 @@
 #include <sys/statfs.h>
 
 
-/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
+/* Used like: return __statfs_link_max (__statfs (name, &buf), &buf); */
 extern long int __statfs_link_max (int result, const struct statfs *fsbuf);
 
 
-/* Used like: return statfs_filesize_max (__statfs (name, &buf), &buf); */
+/* Used like: return __statfs_filesize_max (__statfs (name, &buf), &buf); */
 extern long int __statfs_filesize_max (int result, const struct statfs *fsbuf);
 
 
-/* Used like: return statfs_link_max (__statfs (name, &buf), &buf); */
+/* Used like: return __statfs_link_max (__statfs (name, &buf), &buf); */
 extern long int __statfs_symlinks (int result, const struct statfs *fsbuf);
+
+
+/* Used like: return __statfs_chown_restricted (__statfs (name, &buf), &buf);*/
+extern long int __statfs_chown_restricted (int result,
+					   const struct statfs *fsbuf);
diff --git a/libc/sysdeps/unix/sysv/linux/s390/sys/user.h b/libc/sysdeps/unix/sysv/linux/s390/sys/user.h
index f00caea84..cd3e60cf0 100644
--- a/libc/sysdeps/unix/sysv/linux/s390/sys/user.h
+++ b/libc/sysdeps/unix/sysv/linux/s390/sys/user.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000,2005 Free Software Foundation, Inc.
+/* Copyright (C) 2000,2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -56,7 +56,7 @@ struct _user_regs_struct
   unsigned long orig_gpr2;		/* Original gpr2.  */
   struct _user_fpregs_struct fp_regs;	/* Floating point registers.  */
   struct _user_per_struct per_info;	/* Hardware tracing registers.  */
-  unsigned long ieee_instruction_pointer; 
+  unsigned long ieee_instruction_pointer;	/* Always 0.  */
 };
 
 struct user {
diff --git a/libc/sysdeps/unix/sysv/linux/sysconf.c b/libc/sysdeps/unix/sysv/linux/sysconf.c
index f9f6f1bfa..ab9cddc30 100644
--- a/libc/sysdeps/unix/sysv/linux/sysconf.c
+++ b/libc/sysdeps/unix/sysv/linux/sysconf.c
@@ -1,5 +1,5 @@
 /* Get file-specific information about a file.  Linux version.
-   Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2006, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -23,7 +23,9 @@
 #include <sysdep.h>
 #include <time.h>
 #include <unistd.h>
+#include <sys/resource.h>
 #include <not-cancel.h>
+#include <ldsodefs.h>
 
 static long int posix_sysconf (int name);
 
@@ -70,6 +72,22 @@ __sysconf (int name)
       }
 #endif
 
+    case _SC_ARG_MAX:
+#if __LINUX_KERNEL_VERSION < 0x020617
+      /* Determine whether this is a kernel 2.6.23 or later.  Only
+	 then do we have an argument limit determined by the stack
+	 size.  */
+      if (GLRO(dl_discover_osversion) () >= 0x020617)
+#endif
+	{
+	  /* Use getrlimit to get the stack limit.  */
+	  struct rlimit rlimit;
+	  if (__getrlimit (RLIMIT_STACK, &rlimit) == 0)
+	    return MAX (ARG_MAX, rlimit.rlim_cur / 4);
+	}
+
+      return ARG_MAX;
+
     case _SC_NGROUPS_MAX:
       /* Try to read the information from the /proc/sys/kernel/ngroups_max
 	 file.  */