77 lines
1.8 KiB
Diff
77 lines
1.8 KiB
Diff
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commit 193e51deccc62544f6423eb5e5eefc8a23aad679
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Author: Sven Schnelle <svens@linux.ibm.com>
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Date: Thu Dec 16 12:43:54 2021 +0100
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add slurp_proc_file()
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slurp_file() cannot be used to read proc files, as they are returning
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a size of zero in stat(). Add a function slurp_proc_file() which is
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similar to slurp_file(), but doesn't require the size of the file to
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be known.
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Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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diff --git a/kexec/kexec.c b/kexec/kexec.c
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index f63b36b771eb95a93f07a7c286c4974a558aec8d..f3adac517161d448552a16fd79488c1df100d356 100644
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--- a/kexec/kexec.c
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+++ b/kexec/kexec.c
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@@ -1106,6 +1106,57 @@ static void remove_parameter(char *line, const char *param_name)
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}
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}
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+static ssize_t _read(int fd, void *buf, size_t count)
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+{
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+ ssize_t ret, offset = 0;
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+
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+ do {
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+ ret = read(fd, buf + offset, count - offset);
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+ if (ret < 0) {
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+ if ((errno == EINTR) || (errno == EAGAIN))
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+ continue;
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+ return ret;
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+ }
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+ offset += ret;
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+ } while (ret && offset < count);
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+
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+ return offset;
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+}
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+
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+static char *slurp_proc_file(const char *filename, size_t *len)
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+{
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+ ssize_t ret, startpos = 0;
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+ unsigned int size = 64;
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+ char *buf = NULL, *tmp;
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+ int fd;
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+
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+ fd = open(filename, O_RDONLY);
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+ if (fd == -1)
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+ return NULL;
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+
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+ do {
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+ size *= 2;
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+ tmp = realloc(buf, size);
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+ if (!tmp) {
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+ free(buf);
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+ return NULL;
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+ }
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+ buf = tmp;
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+
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+ ret = _read(fd, buf + startpos, size - startpos);
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+ if (ret < 0) {
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+ free(buf);
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+ return NULL;
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+ }
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+
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+ startpos += ret;
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+
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+ } while(ret);
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+
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+ *len = startpos;
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+ return buf;
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+}
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+
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/*
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* Returns the contents of the current command line to be used with
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* --reuse-cmdline option. The function gets called from architecture specific
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