[PATCH v2] Always use the same method to query the system page size

[Ulf Hermann]

This makes it easier to write a replacement for it on systems where
sysconf(3) doesn't exist.

Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
---
  lib/ChangeLog                  | 4 ++++
  lib/crc32_file.c               | 2 +-
  libdwfl/ChangeLog              | 5 +++++
  libdwfl/linux-kernel-modules.c | 2 +-
  libdwfl/linux-proc-maps.c      | 2 +-
  5 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/lib/ChangeLog b/lib/ChangeLog
index 5ccf4d6..6578ddb 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,7 @@
+2017-02-15  Ulf Hermann  <ulf.hermann@qt.io>
+
+	* crc32_file.c: Use _SC_PAGESIZE rather than _SC_PAGE_SIZE.
+
  2017-02-14  Ulf Hermann  <ulf.hermann@qt.io>
  
  	* color.h: New file.
diff --git a/lib/crc32_file.c b/lib/crc32_file.c
index 57e4298..f7607d0 100644
--- a/lib/crc32_file.c
+++ b/lib/crc32_file.c
@@ -53,7 +53,7 @@ crc32_file (int fd, uint32_t *resp)
        void *mapped = mmap (NULL, mapsize, PROT_READ, MAP_PRIVATE, fd, 0);
        if (mapped == MAP_FAILED && errno == ENOMEM)
  	{
-	  const size_t pagesize = sysconf (_SC_PAGE_SIZE);
+	  const size_t pagesize = sysconf (_SC_PAGESIZE);
  	  mapsize = ((mapsize / 2) + pagesize - 1) & -pagesize;
  	  while (mapsize >= pagesize
  		 && (mapped = mmap (NULL, mapsize, PROT_READ, MAP_PRIVATE,
diff --git a/libdwfl/ChangeLog b/libdwfl/ChangeLog
index 57671ea..52466cc 100644
--- a/libdwfl/ChangeLog
+++ b/libdwfl/ChangeLog
@@ -1,3 +1,8 @@
+2017-02-15  Ulf Hermann  <ulf.hermann@qt.io>
+
+	* linux-kernel-modules.c: Use sysconf(_SC_PAGESIZE) to get page size.
+	* linux-proc-maps.c: Likewise.
+
  2016-12-29  Luiz Angelo Daros de Luca  <luizluca@gmail.com>
  
  	* dwfl_build_id_find_elf.c: Include system.h.
diff --git a/libdwfl/linux-kernel-modules.c b/libdwfl/linux-kernel-modules.c
index 9cd8ea9..a7ac19d 100644
--- a/libdwfl/linux-kernel-modules.c
+++ b/libdwfl/linux-kernel-modules.c
@@ -500,7 +500,7 @@ intuit_kernel_bounds (Dwarf_Addr *start, Dwarf_Addr *end, Dwarf_Addr *notes)
  	if (*notes == 0 && !strcmp (state.p, "__start_notes\n"))
  	  *notes = *end;
  
-      Dwarf_Addr round_kernel = sysconf (_SC_PAGE_SIZE);
+      Dwarf_Addr round_kernel = sysconf (_SC_PAGESIZE);
        *start &= -(Dwarf_Addr) round_kernel;
        *end += round_kernel - 1;
        *end &= -(Dwarf_Addr) round_kernel;
diff --git a/libdwfl/linux-proc-maps.c b/libdwfl/linux-proc-maps.c
index 4ae1e74..094dd53 100644
--- a/libdwfl/linux-proc-maps.c
+++ b/libdwfl/linux-proc-maps.c
@@ -418,7 +418,7 @@ dwfl_linux_proc_find_elf (Dwfl_Module *mod __attribute__ ((unused)),
        if (fd < 0)
  	goto detach;
  
-      *elfp = elf_from_remote_memory (base, getpagesize (), NULL,
+      *elfp = elf_from_remote_memory (base, sysconf (_SC_PAGESIZE), NULL,
  				      &read_proc_memory, &fd);
  
        close (fd);
-- 
2.1.4