New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 548 insertions, 28 deletions

diff --git a/libnetdata/procfile/Makefile.am b/libnetdata/procfile/Makefile.am
new file mode 100644
index 000000000..1cb69ed99
--- /dev/null
+++ b/libnetdata/procfile/Makefile.am
@@ -0,0 +1,9 @@
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diff --git a/libnetdata/procfile/Makefile.in b/libnetdata/procfile/Makefile.in
new file mode 100644
index 000000000..643e00ba1
--- /dev/null
+++ b/libnetdata/procfile/Makefile.in
@@ -0,0 +1,464 @@
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diff --git a/libnetdata/procfile/README.md b/libnetdata/procfile/README.md
new file mode 100644
index 000000000..279885f93
--- /dev/null
+++ b/libnetdata/procfile/README.md
@@ -0,0 +1,61 @@
+
+# PROCFILE
+
+procfile is a library for reading text data files (i.e `/proc` files) in the fastest possible way.
+
+## How it works
+
+The library automatically adapts (through the iterations) its memory so that each file
+is read with single `read()` call.
+
+Then the library splits the file into words, using the supplied separators.
+The library also supported quoted words (i.e. strings within of which the separators are ignored).
+
+### Initialization
+
+Initially the caller: 
+
+- calls `procfile_open()` to open the file and allocate the structures needed.
+
+### Iterations
+
+For each iteration, the caller:
+
+- calls `procfile_readall()` to read updated contents.
+   This call also rewinds (`lseek()` to 0) before reading it.
+
+   For every file, a [BUFFER](../buffer/) is used that is automatically adjusted to fit
+   the entire file contents of the file. So the file is read with a single `read()` call
+   (providing atomicity / consistency when the data are read from the kernel).
+
+   Once the data are read, 2 arrays of pointers are updated:
+
+   - a `words` array, pointing to each word in the data read
+   - a `lines` array, pointing to the first word for each line
+
+   This is highly optimized. Both arrays are automatically adjusted to
+   fit all contents and are updated in a single pass on the data.
+   
+   The library provides a number of macros:
+   
+   - `procfile_lines()` returns the # of lines read
+   - `procfile_linewords()` returns the # of words in the given line
+   - `procfile_word()` returns a pointer the given word #
+   - `procfile_line()` returns a pointer to the first word of the given line #
+   - `procfile_lineword()` returns a pointer to the given word # of the given line #
+
+### Cleanup
+
+When the caller exits:
+
+- calls `procfile_free()` to close the file and free all memory used.
+
+### Performance
+
+- a **raspberry Pi 1** (the oldest single core one) can process 5.000+ `/proc` files per second.
+- a **J1900 Celeron** processor can process 23.000+ `/proc` files per second per core.
+
+To achieve this kind of performance, the library tries to work in batches so that the code
+and the data are inside the processor's caches.
+
+This library is extensively used in netdata and its plugins.
diff --git a/src/procfile.c b/libnetdata/procfile/procfile.c
index 044f975b5..4a812baab 100644
--- a/src/procfile.c
+++ b/libnetdata/procfile/procfile.c
@@ -1,5 +1,6 @@
-#include "common.h"
-#include "procfile.h"
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../libnetdata.h"
 
 #define PF_PREFIX "PROCFILE"
 
@@ -7,6 +8,8 @@
 #define PFLINES_INCREASE_STEP 10
 #define PROCFILE_INCREMENT_BUFFER 512
 
+int procfile_open_flags = O_RDONLY;
+
 int procfile_adaptive_initial_allocation = 0;
 
 // if adaptive allocation is set, these store the
@@ -391,7 +394,7 @@ void procfile_set_open_close(procfile *ff, const char *open, const char *close)
 procfile *procfile_open(const char *filename, const char *separators, uint32_t flags) {
     debug(D_PROCFILE, PF_PREFIX ": Opening file '%s'", filename);
 
-    int fd = open(filename, O_RDONLY, 0666);
+    int fd = open(filename, procfile_open_flags, 0666);
     if(unlikely(fd == -1)) {
         if(unlikely(!(flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot open file '%s'", filename);
         return NULL;
@@ -427,7 +430,7 @@ procfile *procfile_reopen(procfile *ff, const char *filename, const char *separa
         close(ff->fd);
     }
 
-    ff->fd = open(filename, O_RDONLY, 0666);
+    ff->fd = open(filename, procfile_open_flags, 0666);
     if(unlikely(ff->fd == -1)) {
         procfile_close(ff);
         return NULL;
@@ -451,6 +454,7 @@ procfile *procfile_reopen(procfile *ff, const char *filename, const char *separa
 void procfile_print(procfile *ff) {
     size_t lines = procfile_lines(ff), l;
     char *s;
+    (void)s;
 
     debug(D_PROCFILE, "File '%s' with %zu lines and %zu words", procfile_filename(ff), ff->lines->len, ff->words->len);
 
diff --git a/src/procfile.h b/libnetdata/procfile/procfile.h
index 012c6efe1..b107358ab 100644
--- a/src/procfile.h
+++ b/libnetdata/procfile/procfile.h
@@ -1,31 +1,10 @@
-/*
- * procfile is a library for reading kernel files from /proc
- *
- * The idea is this:
- *
- *  - every file is opened once with procfile_open().
- *
- *  - to read updated contents, we rewind it (lseek() to 0) and read again
- *    with procfile_readall().
- *
- *  - for every file, we use a buffer that is adjusted to fit its entire
- *    contents in memory, allowing us to read it with a single read() call.
- *    (this provides atomicity / consistency on the data read from the kernel)
- *
- *  - once the data are read, we update two arrays of pointers:
- *     - a words array, pointing to each word in the data read
- *     - a lines array, pointing to the first word for each line
- *
- *    This is highly optimized. Both arrays are automatically adjusted to
- *    fit all contents and are updated in a single pass on the data:
- *     - a raspberry Pi can process 5.000+ files / sec.
- *     - a J1900 celeron processor can process 23.000+ files / sec.
-*/
-
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef NETDATA_PROCFILE_H
 #define NETDATA_PROCFILE_H 1
 
+#include "../libnetdata.h"
+
 // ----------------------------------------------------------------------------
 // An array of words
 
@@ -103,6 +82,9 @@ extern char *procfile_filename(procfile *ff);
 
 // ----------------------------------------------------------------------------
 
+// set to the O_XXXX flags, to have procfile_open and procfile_reopen use them when opening proc files
+extern int procfile_open_flags;
+
 // set this to 1, to have procfile adapt its initial buffer allocation to the max allocation used so far
 extern int procfile_adaptive_initial_allocation;