slurp_file() cannot be used to read proc files, as they are returning
a size of zero in stat(). Add a function slurp_proc_file() which is
similar to slurp_file(), but doesn't require the size of the file to
be known.
Signed-off-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
---
kexec/kexec.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/kexec/kexec.c b/kexec/kexec.c
index f63b36b771eb..a1acba2adf2a 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -1106,6 +1106,38 @@ static void remove_parameter(char *line, const char *param_name)
}
}
+static char *slurp_proc_file(const char *filename, size_t *len)
+{
+ ssize_t ret, startpos = 0;
+ unsigned int size = 64;
+ char *buf = NULL, *tmp;
+ int fd;
+
+ fd = open(filename, O_RDONLY);
+ if (fd == -1)
+ return NULL;
+
+ do {
+ size *= 2;
+ tmp = realloc(buf, size);
+ if (!tmp) {
+ free(buf);
+ return NULL;
+ }
+ buf = tmp;
+
+ ret = read(fd, buf + startpos, size - startpos);
+ if (ret < 0) {
+ free(buf);
+ return NULL;
+ }
+ startpos += ret;
+ *len = startpos;
+ } while (ret == size);
+
+ return buf;
+}
+
/*
* Returns the contents of the current command line to be used with
* --reuse-cmdline option. The function gets called from architecture specific
--
2.32.0
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