Here are two test (example) programs.
task_diag - request information for two processes.
test_diag_all - request information about all processes
v2: Fixes from David Ahern:
* task_diag: Fix 8-byte alignment for vma and vma_stats
Signed-off-by: Andrey Vagin <ava...@openvz.org>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/task_diag/.gitignore | 4 +
tools/testing/selftests/task_diag/Makefile | 16 ++
tools/testing/selftests/task_diag/_run.sh | 21 +++
tools/testing/selftests/task_diag/fork.c | 30 ++++
tools/testing/selftests/task_diag/run.sh | 1 +
tools/testing/selftests/task_diag/task_diag.h | 1 +
tools/testing/selftests/task_diag/task_diag_all.c | 150 ++++++++++++++++++
tools/testing/selftests/task_diag/task_diag_comm.c | 172 +++++++++++++++++++++
tools/testing/selftests/task_diag/task_diag_comm.h | 34 ++++
tools/testing/selftests/task_diag/task_proc_all.c | 35 +++++
11 files changed, 465 insertions(+)
create mode 100644 tools/testing/selftests/task_diag/.gitignore
create mode 100644 tools/testing/selftests/task_diag/Makefile
create mode 100755 tools/testing/selftests/task_diag/_run.sh
create mode 100644 tools/testing/selftests/task_diag/fork.c
create mode 100755 tools/testing/selftests/task_diag/run.sh
create mode 120000 tools/testing/selftests/task_diag/task_diag.h
create mode 100644 tools/testing/selftests/task_diag/task_diag_all.c
create mode 100644 tools/testing/selftests/task_diag/task_diag_comm.c
create mode 100644 tools/testing/selftests/task_diag/task_diag_comm.h
create mode 100644 tools/testing/selftests/task_diag/task_proc_all.c
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index b04afc3..b399c8b 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -29,6 +29,7 @@ TARGETS += user
TARGETS += vm
TARGETS += x86
TARGETS += zram
+TARGETS += task_diag
#Please keep the TARGETS list alphabetically sorted
# Run "make quicktest=1 run_tests" or
# "make quicktest=1 kselftest from top level Makefile
diff --git a/tools/testing/selftests/task_diag/.gitignore
b/tools/testing/selftests/task_diag/.gitignore
new file mode 100644
index 0000000..f963a1f
--- /dev/null
+++ b/tools/testing/selftests/task_diag/.gitignore
@@ -0,0 +1,4 @@
+task_diag
+task_diag_all
+task_proc_all
+fork
diff --git a/tools/testing/selftests/task_diag/Makefile
b/tools/testing/selftests/task_diag/Makefile
new file mode 100644
index 0000000..69b7934
--- /dev/null
+++ b/tools/testing/selftests/task_diag/Makefile
@@ -0,0 +1,16 @@
+all: task_diag_all fork task_proc_all fork
+
+CFLAGS += -g -Wall -O2 -I/usr/include/libnl3
+LDFLAGS += -lnl-3
+TEST_PROGS := run.sh
+include ../lib.mk
+
+task_diag_all.o: task_diag_all.c task_diag_comm.h
+task_diag_comm.o: task_diag_comm.c task_diag_comm.h
+
+task_diag_all: task_diag_all.o task_diag_comm.o
+fork: fork.c
+task_proc_all: task_proc_all.c
+
+clean:
+ rm -rf task_diag task_diag_all task_diag_comm.o task_diag_all.o
task_diag.o fork task_proc_all
diff --git a/tools/testing/selftests/task_diag/_run.sh
b/tools/testing/selftests/task_diag/_run.sh
new file mode 100755
index 0000000..3f541fe
--- /dev/null
+++ b/tools/testing/selftests/task_diag/_run.sh
@@ -0,0 +1,21 @@
+#!/bin/sh
+set -o pipefail
+set -e -x
+
+./fork 1000
+
+nprocesses=`./task_diag_all all --maps | grep 'pid.*tgid.*ppid.*comm fork$' |
wc -l`
+nthreads=`./task_diag_all All --smaps --cred | grep 'pid.*tgid.*ppid.*comm
fork$' | wc -l`
+nchildren=`./task_diag_all children --pid 1 | grep 'pid.*tgid.*ppid.*comm
fork$' | wc -l`
+
+./task_diag_all one --pid 1 --cred
+
+killall -9 fork
+
+[ "$nthreads" -eq 1000 ] &&
+[ "$nprocesses" -eq 1000 ] &&
+[ "$nchildren" -eq 1000 ] &&
+true || {
+ echo "Unexpected number of tasks $nthreads:$nprocesses" 1>&2
+ exit 1
+}
diff --git a/tools/testing/selftests/task_diag/fork.c
b/tools/testing/selftests/task_diag/fork.c
new file mode 100644
index 0000000..c6e17d1
--- /dev/null
+++ b/tools/testing/selftests/task_diag/fork.c
@@ -0,0 +1,30 @@
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+ int i, n;
+
+ if (argc < 2)
+ return 1;
+
+ n = atoi(argv[1]);
+ for (i = 0; i < n; i++) {
+ pid_t pid;
+
+ pid = fork();
+ if (pid < 0) {
+ printf("Unable to fork: %m\n");
+ return 1;
+ }
+ if (pid == 0) {
+ while (1)
+ sleep(1000);
+ return 0;
+ }
+ }
+
+ return 0;
+}
diff --git a/tools/testing/selftests/task_diag/run.sh
b/tools/testing/selftests/task_diag/run.sh
new file mode 100755
index 0000000..28a8550
--- /dev/null
+++ b/tools/testing/selftests/task_diag/run.sh
@@ -0,0 +1 @@
+unshare -p -f -m --mount-proc ./_run.sh && { echo PASS; exit 0; } || { echo
FAIL; exit 1; }
diff --git a/tools/testing/selftests/task_diag/task_diag.h
b/tools/testing/selftests/task_diag/task_diag.h
new file mode 120000
index 0000000..d20a38c
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_diag.h
@@ -0,0 +1 @@
+../../../../include/uapi/linux/task_diag.h
\ No newline at end of file
diff --git a/tools/testing/selftests/task_diag/task_diag_all.c
b/tools/testing/selftests/task_diag/task_diag_all.c
new file mode 100644
index 0000000..d865207
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_diag_all.c
@@ -0,0 +1,150 @@
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <getopt.h>
+
+#include <linux/netlink.h>
+#include <netlink/msg.h>
+
+#include "task_diag.h"
+#include "task_diag_comm.h"
+
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
+#ifndef NETLINK_SCM_PID
+#define NETLINK_SCM_PID 11
+#endif
+
+static void usage(char *name)
+{
+ pr_err("Usage: %s command [options]", name);
+ pr_err(
+"Commands:\n"
+"\tall - dump all processes\n"
+"\tAll - dump all threads\n"
+"\tthreads - dump all thread for the specified process\n"
+"\tchildren - dump all thread for the specified process\n"
+"\tone - dump the specified process\n"
+"Options:\n"
+"\t-p|--pid - PID of the required process\n"
+"\t-m|--maps - dump memory regions\n"
+"\t-s|--smaps - dump statistics for memory regions\n"
+"\t-c|--cred - dump credentials"
+);
+}
+int main(int argc, char *argv[])
+{
+ int exit_status = 1, fd;
+ struct task_diag_pid *req;
+ char nl_req[4096];
+ struct nlmsghdr *hdr = (void *)nl_req;
+ int last_pid = 0;
+ int opt, idx;
+ int err, size = 0;
+ static const char short_opts[] = "p:cms";
+ static struct option long_opts[] = {
+ { "pid", required_argument, 0, 'p' },
+ { "maps", no_argument, 0, 'm' },
+ { "smaps", no_argument, 0, 's' },
+ { "cred", no_argument, 0, 'c' },
+ {},
+ };
+
+ hdr->nlmsg_len = nlmsg_total_size(0);
+
+ req = nlmsg_data(hdr);
+ size += nla_total_size(sizeof(*req));
+
+ hdr->nlmsg_len += size;
+
+
+ req->show_flags = TASK_DIAG_SHOW_BASE;
+
+ if (argc < 2) {
+ pr_err("Usage: %s type pid scm_pid", argv[0]);
+ return 1;
+ }
+
+ req->pid = 0; /* dump all tasks by default */
+
+ switch (argv[1][0]) {
+ case 'c':
+ req->dump_strategy = TASK_DIAG_DUMP_CHILDREN;
+ break;
+ case 't':
+ req->dump_strategy = TASK_DIAG_DUMP_THREAD;
+ break;
+ case 'o':
+ req->dump_strategy = TASK_DIAG_DUMP_ONE;
+ break;
+ case 'a':
+ req->dump_strategy = TASK_DIAG_DUMP_ALL;
+ req->pid = 0;
+ break;
+ case 'A':
+ req->dump_strategy = TASK_DIAG_DUMP_ALL_THREAD;
+ req->pid = 0;
+ break;
+ default:
+ usage(argv[0]);
+ return 1;
+ }
+
+ while (1) {
+ idx = -1;
+ opt = getopt_long(argc, argv, short_opts, long_opts, &idx);
+ if (opt == -1)
+ break;
+ switch (opt) {
+ case 'p':
+ req->pid = atoi(optarg);
+ break;
+ case 'c':
+ req->show_flags |= TASK_DIAG_SHOW_CRED;
+ break;
+ case 'm':
+ req->show_flags |= TASK_DIAG_SHOW_VMA;
+ break;
+ case 's':
+ req->show_flags |= TASK_DIAG_SHOW_VMA_STAT |
TASK_DIAG_SHOW_VMA;
+ break;
+ default:
+ usage(argv[0]);
+ return 1;
+ }
+ }
+
+ fd = open("/proc/task-diag", O_RDWR);
+ if (fd < 0)
+ return -1;
+
+ if (write(fd, hdr, hdr->nlmsg_len) != hdr->nlmsg_len)
+ return -1;
+
+ while (1) {
+ char buf[163840];
+ size = read(fd, buf, sizeof(buf));
+
+ if (size < 0)
+ goto err;
+
+ if (size == 0)
+ break;
+
+ err = nlmsg_receive(buf, size, &show_task, &last_pid);
+ if (err < 0)
+ goto err;
+
+ if (err == 0)
+ break;
+ }
+
+ exit_status = 0;
+err:
+ return exit_status;
+}
diff --git a/tools/testing/selftests/task_diag/task_diag_comm.c
b/tools/testing/selftests/task_diag/task_diag_comm.c
new file mode 100644
index 0000000..65f2536
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_diag_comm.c
@@ -0,0 +1,172 @@
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <linux/netlink.h>
+#include <netlink/cli/utils.h>
+
+#include "task_diag.h"
+#include "task_diag_comm.h"
+
+int quiet;
+
+#define PSS_SHIFT 12
+
+int nlmsg_receive(void *buf, int len, int (*cb)(struct nlmsghdr *, void *),
void *args)
+{
+ struct nlmsghdr *hdr;
+
+ for (hdr = (struct nlmsghdr *)buf;
+ NLMSG_OK(hdr, len); hdr = NLMSG_NEXT(hdr, len)) {
+
+ if (hdr->nlmsg_type == NLMSG_DONE) {
+ int *len = (int *)NLMSG_DATA(hdr);
+
+ if (*len < 0) {
+ pr_err("ERROR %d reported by netlink (%s)\n",
+ *len, strerror(-*len));
+ return *len;
+ }
+
+ return 0;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr
*)NLMSG_DATA(hdr);
+
+ if (hdr->nlmsg_len - sizeof(*hdr) < sizeof(struct
nlmsgerr)) {
+ pr_err("ERROR truncated\n");
+ return -1;
+ }
+
+ if (err->error == 0)
+ return 0;
+
+ return -1;
+ }
+ if (cb && cb(hdr, args))
+ return -1;
+ }
+
+ return 1;
+}
+
+int show_task(struct nlmsghdr *hdr, void *arg)
+{
+ int msg_len;
+ struct msgtemplate *msg;
+ struct task_diag_msg *diag_msg;
+ struct nlattr *na;
+ int *last_pid = arg;
+ int len;
+
+ msg_len = NLMSG_PAYLOAD(hdr, 0);
+
+ msg = (struct msgtemplate *)hdr;
+ diag_msg = NLMSG_DATA(msg);
+
+#if 1
+ if (diag_msg->pid != *last_pid)
+ pr_info("Start getting information about %d\n", diag_msg->pid);
+ else
+ pr_info("Continue getting information about %d\n",
diag_msg->pid);
+#endif
+ *last_pid = diag_msg->pid;
+
+ na = ((void *) diag_msg) + NLMSG_ALIGN(sizeof(*diag_msg));
+ len = NLMSG_ALIGN(sizeof(*diag_msg));
+ while (len < msg_len) {
+ len += NLA_ALIGN(na->nla_len);
+ switch (na->nla_type) {
+ case TASK_DIAG_BASE:
+ {
+ struct task_diag_base *msg;
+
+ /* For nested attributes, na follows */
+ msg = NLA_DATA(na);
+ pr_info("pid %5d tgid %5d ppid %5d sid %5d pgid %5d
comm %s\n",
+ msg->pid, msg->tgid, msg->ppid, msg->sid,
msg->pgid, msg->comm);
+ }
+ break;
+
+ case TASK_DIAG_CRED:
+ {
+ struct task_diag_creds *creds;
+
+ creds = NLA_DATA(na);
+ pr_info("uid: %d %d %d %d\n", creds->uid,
+ creds->euid, creds->suid, creds->fsuid);
+ pr_info("gid: %d %d %d %d\n", creds->uid,
+ creds->euid, creds->suid, creds->fsuid);
+ pr_info("CapInh: %08x%08x\n",
+ creds->cap_inheritable.cap[1],
+ creds->cap_inheritable.cap[0]);
+ pr_info("CapPrm: %08x%08x\n",
+ creds->cap_permitted.cap[1],
+ creds->cap_permitted.cap[0]);
+ pr_info("CapEff: %08x%08x\n",
+ creds->cap_effective.cap[1],
+ creds->cap_effective.cap[0]);
+ pr_info("CapBnd: %08x%08x\n", creds->cap_bset.cap[1],
+ creds->cap_bset.cap[0]);
+ }
+ break;
+
+ case TASK_DIAG_VMA:
+ {
+ struct task_diag_vma *vma_tmp, vma;
+
+ task_diag_for_each_vma(vma_tmp, na) {
+ char *name;
+ struct task_diag_vma_stat *stat_tmp, stat;
+
+ name = task_diag_vma_name(vma_tmp);
+ if (name == NULL)
+ name = "";
+
+ memcpy(&vma, vma_tmp, sizeof(vma));
+ pr_info("%016llx-%016llx %016llx %s\n",
+ vma.start, vma.end, vma.vm_flags, name);
+
+ stat_tmp = task_diag_vma_stat(vma_tmp);
+ if (stat_tmp)
+ memcpy(&stat, stat_tmp, sizeof(stat));
+ else
+ memset(&stat, 0, sizeof(stat));
+
+ pr_info(
+ "Size: %8llu kB\n"
+ "Rss: %8llu kB\n"
+ "Pss: %8llu kB\n"
+ "Shared_Clean: %8llu kB\n"
+ "Shared_Dirty: %8llu kB\n"
+ "Private_Clean: %8llu kB\n"
+ "Private_Dirty: %8llu kB\n"
+ "Referenced: %8llu kB\n"
+ "Anonymous: %8llu kB\n"
+ "AnonHugePages: %8llu kB\n"
+ "Swap: %8llu kB\n",
+ (vma.end - vma.start) >> 10,
+ stat.resident >> 10,
+ (stat.pss >> (10 + PSS_SHIFT)),
+ stat.shared_clean >> 10,
+ stat.shared_dirty >> 10,
+ stat.private_clean >> 10,
+ stat.private_dirty >> 10,
+ stat.referenced >> 10,
+ stat.anonymous >> 10,
+ stat.anonymous_thp >> 10,
+ stat.swap >> 10);
+ }
+ }
+ break;
+ default:
+ pr_info("Unknown nla_type %d\n",
+ na->nla_type);
+ }
+ na = ((void *) diag_msg) + len;
+ }
+
+ return 0;
+}
diff --git a/tools/testing/selftests/task_diag/task_diag_comm.h
b/tools/testing/selftests/task_diag/task_diag_comm.h
new file mode 100644
index 0000000..40e83b7
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_diag_comm.h
@@ -0,0 +1,34 @@
+#ifndef __TASK_DIAG_COMM__
+#define __TASK_DIAG_COMM__
+
+#include <stdio.h>
+
+#include "task_diag.h"
+
+/*
+ * Generic macros for dealing with netlink sockets. Might be duplicated
+ * elsewhere. It is recommended that commercial grade applications use
+ * libnl or libnetlink and use the interfaces provided by the library
+ */
+#define GENLMSG_DATA(glh) ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
+#define GENLMSG_PAYLOAD(glh) (NLMSG_PAYLOAD(glh, 0) - GENL_HDRLEN)
+#define NLA_DATA(na) ((void *)((char *)(na) + NLA_HDRLEN))
+#define NLA_PAYLOAD(len) (len - NLA_HDRLEN)
+
+#define pr_err(fmt, ...) \
+ fprintf(stderr, "%s:%d" fmt"\n", __func__, __LINE__,
##__VA_ARGS__)
+
+#define pr_perror(fmt, ...) \
+ fprintf(stderr, fmt " : %m\n", ##__VA_ARGS__)
+
+extern int quiet;
+#define pr_info(fmt, arg...) \
+ do { \
+ if (!quiet) \
+ printf(fmt, ##arg); \
+ } while (0) \
+
+int nlmsg_receive(void *buf, int len, int (*cb)(struct nlmsghdr *, void *),
void *args);
+extern int show_task(struct nlmsghdr *hdr, void *arg);
+
+#endif /* __TASK_DIAG_COMM__ */
diff --git a/tools/testing/selftests/task_diag/task_proc_all.c
b/tools/testing/selftests/task_diag/task_proc_all.c
new file mode 100644
index 0000000..07ee80c
--- /dev/null
+++ b/tools/testing/selftests/task_diag/task_proc_all.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+
+int main(int argc, char **argv)
+{
+ DIR *d;
+ int fd, tasks = 0;
+ struct dirent *de;
+ char buf[4096];
+
+ d = opendir("/proc");
+ if (d == NULL)
+ return 1;
+
+ while ((de = readdir(d))) {
+ if (de->d_name[0] < '0' || de->d_name[0] > '9')
+ continue;
+ snprintf(buf, sizeof(buf), "/proc/%s/stat", de->d_name);
+ fd = open(buf, O_RDONLY);
+ read(fd, buf, sizeof(buf));
+ close(fd);
+ tasks++;
+ }
+
+ closedir(d);
+
+ printf("tasks: %d\n", tasks);
+
+ return 0;
+}
--
2.5.5
