mirror of
https://github.com/ibm-s390-linux/s390-tools.git
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b627b8d8e1
This commit is based on the s390-tools-1.39.0 version. Changes on top of s390-tools-1.39.0: - Add MIT license to all source files - Add LICENSE file - Transform REAMDE to README.md (markdown) - Add AUTHORS.md file - Add CONTRIBUTING.md file - Move changelog from README to CHANGELOG.md file Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
94 lines
1.8 KiB
C
94 lines
1.8 KiB
C
/*
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* hyptop - Show hypervisor performance data on System z
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*
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* Common functions for debugfs data gatherer
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*
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* Copyright IBM Corp. 2010, 2017
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "dg_debugfs.h"
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#include "helper.h"
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#include "hyptop.h"
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#define HYPFS_SUBDIR "/s390_hypfs/"
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static char *l_debugfs_dir;
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static void l_check_rc(int rc, int exit_on_err)
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{
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if (!exit_on_err)
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return;
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if (rc == -EACCES)
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ERR_EXIT("Permission denied, check \"%s/s390_hypfs/\"\n",
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l_debugfs_dir);
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if (rc != -ENOENT)
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ERR_EXIT("Could not initialize data gatherer (%s)\n",
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strerror(-rc));
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}
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static void l_check_rc_final(int rc, int exit_on_err)
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{
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if (!exit_on_err)
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return;
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l_check_rc(rc, exit_on_err);
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ERR_EXIT("Could not initialize data gatherer (%s)\n", strerror(-rc));
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}
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/*
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* Initialize debugfs data gatherer backend
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*/
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int dg_debugfs_init(int exit_on_err)
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{
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int rc;
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l_debugfs_dir = ht_mount_point_get("debugfs");
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if (!l_debugfs_dir) {
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if (!exit_on_err)
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return -ENODEV;
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ERR_EXIT("Debugfs is not mounted, try \"mount none -t debugfs "
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"/sys/kernel/debug\"\n");
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}
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rc = dg_debugfs_vm_init();
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if (rc == 0)
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return 0;
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else
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l_check_rc(rc, exit_on_err);
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rc = dg_debugfs_lpar_init();
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if (rc == 0)
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return 0;
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else
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l_check_rc_final(rc, exit_on_err);
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return rc;
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}
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/*
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* Open a debugfs file
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*/
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int dg_debugfs_open(const char *file)
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{
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char *path;
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int fh;
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path = ht_alloc(strlen(l_debugfs_dir) + strlen(HYPFS_SUBDIR) +
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strlen(file) + 1);
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path[0] = 0;
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strcat(path, l_debugfs_dir);
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strcat(path, HYPFS_SUBDIR);
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strcat(path, file);
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fh = open(path, O_RDONLY);
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ht_free(path);
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if (fh == -1)
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return -errno;
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else
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return fh;
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}
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