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53645dc4cb
From clang-13:
util/selfmap.c:26:21: error: variable 'errors' set but not used \
[-Werror,-Wunused-but-set-variable]
Quite right of course, but there's no reason not to check errors.
First, incrementing errors is incorrect, because qemu_strtoul
returns an errno not a count -- just or them together so that
we have a non-zero value at the end.
Second, if we have an error, do not add the struct to the list,
but free it instead.
Cc: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* Utility function to get QEMU's own process map
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*
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* Copyright (c) 2020 Linaro Ltd
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "qemu/cutils.h"
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#include "qemu/selfmap.h"
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GSList *read_self_maps(void)
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{
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gchar *maps;
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GSList *map_info = NULL;
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if (g_file_get_contents("/proc/self/maps", &maps, NULL, NULL)) {
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gchar **lines = g_strsplit(maps, "\n", 0);
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int i, entries = g_strv_length(lines);
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for (i = 0; i < entries; i++) {
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gchar **fields = g_strsplit(lines[i], " ", 6);
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if (g_strv_length(fields) > 4) {
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MapInfo *e = g_new0(MapInfo, 1);
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int errors = 0;
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const char *end;
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errors |= qemu_strtoul(fields[0], &end, 16, &e->start);
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errors |= qemu_strtoul(end + 1, NULL, 16, &e->end);
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e->is_read = fields[1][0] == 'r';
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e->is_write = fields[1][1] == 'w';
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e->is_exec = fields[1][2] == 'x';
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e->is_priv = fields[1][3] == 'p';
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errors |= qemu_strtoul(fields[2], NULL, 16, &e->offset);
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e->dev = g_strdup(fields[3]);
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errors |= qemu_strtou64(fields[4], NULL, 10, &e->inode);
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if (!errors) {
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/*
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* The last field may have leading spaces which we
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* need to strip.
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*/
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if (g_strv_length(fields) == 6) {
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e->path = g_strdup(g_strchug(fields[5]));
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}
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map_info = g_slist_prepend(map_info, e);
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} else {
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g_free(e->dev);
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g_free(e);
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}
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}
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g_strfreev(fields);
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}
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g_strfreev(lines);
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g_free(maps);
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}
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/* ensure the map data is in the same order we collected it */
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return g_slist_reverse(map_info);
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}
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/**
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* free_self_maps:
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* @info: a GSlist
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*
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* Free a list of MapInfo structures.
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*/
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static void free_info(gpointer data)
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{
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MapInfo *e = (MapInfo *) data;
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g_free(e->dev);
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g_free(e->path);
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g_free(e);
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}
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void free_self_maps(GSList *info)
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{
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g_slist_free_full(info, &free_info);
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}
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