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authorWu Fengguang <fengguang.wu@intel.com>2009-10-07 16:32:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-10-08 07:36:39 -0700
commit31bbf66eaaaf50ba79e50ab7d3c89531b31c0614 (patch)
treebb96b311a4293649f2f0c9e0870330a94ee7e419 /Documentation/vm
parent0c57effe27eb6544eb44d5fac563b7334e3bc771 (diff)
downloadlinux-31bbf66eaaaf50ba79e50ab7d3c89531b31c0614.tar.gz
page-types: introduce checked_open()
This helps merge duplicate code (now and future) and outstand the main logic. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/vm')
-rw-r--r--Documentation/vm/page-types.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
index e46fb5b2107d..6bdcc0632c24 100644
--- a/Documentation/vm/page-types.c
+++ b/Documentation/vm/page-types.c
@@ -214,6 +214,18 @@ static void fatal(const char *x, ...)
exit(EXIT_FAILURE);
}
+int checked_open(const char *pathname, int flags)
+{
+ int fd = open(pathname, flags);
+
+ if (fd < 0) {
+ perror(pathname);
+ exit(EXIT_FAILURE);
+ }
+
+ return fd;
+}
+
/*
* page flag names
@@ -534,11 +546,7 @@ static void walk_addr_ranges(void)
{
int i;
- kpageflags_fd = open(PROC_KPAGEFLAGS, O_RDONLY);
- if (kpageflags_fd < 0) {
- perror(PROC_KPAGEFLAGS);
- exit(EXIT_FAILURE);
- }
+ kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
if (!nr_addr_ranges)
add_addr_range(0, ULONG_MAX);
@@ -631,11 +639,7 @@ static void parse_pid(const char *str)
opt_pid = parse_number(str);
sprintf(buf, "/proc/%d/pagemap", opt_pid);
- pagemap_fd = open(buf, O_RDONLY);
- if (pagemap_fd < 0) {
- perror(buf);
- exit(EXIT_FAILURE);
- }
+ pagemap_fd = checked_open(buf, O_RDONLY);
sprintf(buf, "/proc/%d/maps", opt_pid);
file = fopen(buf, "r");