[PATCH v3 09/13] print errno when reporting a system call error

[Junio C Hamano]

From: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 builtin/log.c     | 3 ++-
 rerere.c          | 4 ++--
 xdiff-interface.c | 4 ++--
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/builtin/log.c b/builtin/log.c
index b3b10cc1ed..26d6a3cf14 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -858,7 +858,8 @@ static int open_next_file(struct commit *commit, const char 
*subject,
                printf("%s\n", filename.buf + outdir_offset);
 
        if ((rev->diffopt.file = fopen(filename.buf, "w")) == NULL)
-               return error(_("Cannot open patch file %s"), filename.buf);
+               return error_errno(_("Cannot open patch file %s"),
+                                  filename.buf);
 
        strbuf_release(&filename);
        return 0;
diff --git a/rerere.c b/rerere.c
index 971bfedfb2..1351b0c3fb 100644
--- a/rerere.c
+++ b/rerere.c
@@ -484,13 +484,13 @@ static int handle_file(const char *path, unsigned char 
*sha1, const char *output
        io.input = fopen(path, "r");
        io.io.wrerror = 0;
        if (!io.input)
-               return error("Could not open %s", path);
+               return error_errno("Could not open %s", path);
 
        if (output) {
                io.io.output = fopen(output, "w");
                if (!io.io.output) {
                        fclose(io.input);
-                       return error("Could not write %s", output);
+                       return error_errno("Could not write %s", output);
                }
        }
 
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 060038c2d6..d3f78ca2a7 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -164,9 +164,9 @@ int read_mmfile(mmfile_t *ptr, const char *filename)
        size_t sz;
 
        if (stat(filename, &st))
-               return error("Could not stat %s", filename);
+               return error_errno("Could not stat %s", filename);
        if ((f = fopen(filename, "rb")) == NULL)
-               return error("Could not open %s", filename);
+               return error_errno("Could not open %s", filename);
        sz = xsize_t(st.st_size);
        ptr->ptr = xmalloc(sz ? sz : 1);
        if (sz && fread(ptr->ptr, sz, 1, f) != 1) {
-- 
2.13.0-491-g71cfeddc25