a61f78d6e0
Functions related to namespaces were half-in half-out of the
procps library and didn't fit the standard naming scheme.
While struct { long ns[x]} is a bit clunky, its the only way
to "lock in" x. The alternative is to use ns_* variables.
This work was needed before pgrep could be converted.
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
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* libprocps - Library to read proc filesystem
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <proc/namespace.h>
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#include "proc/procps-private.h"
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#define NSPATHLEN 64
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static const char *ns_names[] = {
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[PROCPS_NS_IPC] = "ipc",
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[PROCPS_NS_MNT] = "mnt",
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[PROCPS_NS_NET] = "net",
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[PROCPS_NS_PID] = "pid",
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[PROCPS_NS_USER] = "user",
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[PROCPS_NS_UTS] = "uts",
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};
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/*
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* procps_ns_get_name:
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*
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* Find the name of the namespace with the given ID
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*
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* @id: The ID of the required namespace, see
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* namespace_type
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*
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* Returns: static string of the namespace
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*/
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PROCPS_EXPORT const char *procps_ns_get_name(const int id)
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{
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if (id >= PROCPS_NS_COUNT || id < 0)
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return NULL;
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return ns_names[id];
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}
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/*
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* procps_ns_get_id:
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*
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* Find the namespace ID that matches the given
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* name.
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*
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* @name: the name of the required namespace
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*
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* Returns: ID of found name
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* < 0 means error
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*/
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PROCPS_EXPORT int procps_ns_get_id(const char *name)
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{
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int i;
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if (name == NULL)
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return -EINVAL;
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for (i=0; i < PROCPS_NS_COUNT; i++)
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if (!strcmp(ns_names[i], name))
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return i;
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return -EINVAL;
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}
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/*
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* procs_ns_read_pid:
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*
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* Find all namespaces for the given process.
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* @pid: Process ID for required process
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* @nsp: Pointer to the struct procps_namespaces
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*
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* Returns:
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* 0 on success
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* < 0 on error
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*/
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PROCPS_EXPORT int procps_ns_read_pid(
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const int pid,
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struct procps_namespaces *nsp)
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{
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char path[NSPATHLEN+1];
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struct stat st;
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int i;
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if (nsp == NULL)
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return -EINVAL;
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if (pid < 1)
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return -EINVAL;
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for (i=0; i < PROCPS_NS_COUNT; i++) {
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snprintf(path, NSPATHLEN, "/proc/%d/ns/%s", pid, ns_names[i]);
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if (0 == stat(path, &st))
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nsp->ns[i] = (long)st.st_ino;
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else
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nsp->ns[i] = 0;
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}
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}
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