[idlestat 2/6] Print more details when fopen fails

[Amit Kucheria]

From: Amit Kucheria <amit.kuche...@linaro.org>

Useful for tracking down why the following command fails:
sudo ./idlestat -o /tmp/newfile

where, newfile doesn't already exist

Signed-off-by: Amit Kucheria <amit.kuche...@linaro.org>
---
 idlestat.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/idlestat.c b/idlestat.c
index 9d88ee9..998f62d 100644
--- a/idlestat.c
+++ b/idlestat.c
@@ -749,8 +749,10 @@ static struct cpuidle_datas *idlestat_load(const char 
*path)
        int ret;
 
        f = fopen(path, "r");
-       if (!f)
-               return ptrerror("fopen");
+       if (!f) {
+               fprintf(stderr, "%s: failed to open '%s': %m\n", __func__, 
path);
+               return NULL;
+       }
 
        /* version line */
        fgets(buffer, BUFSIZE, f);
@@ -1055,7 +1057,7 @@ static int idlestat_file_for_each_line(const char *path, 
void *data,
        f = fopen(path, "r");
 
        if (!f) {
-               fprintf(stderr, "failed to open '%s': %m\n", path);
+               fprintf(stderr, "%s: failed to open '%s': %m\n", __func__, 
path);
                return -1;
        }
 
@@ -1080,8 +1082,9 @@ static int idlestat_store(const char *path)
                return -1;
 
        f = fopen(path, "w+");
+
        if (!f) {
-               fprintf(f, "failed to open '%s': %m\n", path);
+               fprintf(f, "%s: failed to open '%s': %m\n", __func__, path);
                return -1;
        }
 
-- 
1.9.1


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