Add proc_find_by_inode(...) which finds pid by inode & gets processe's
command line.
Actually this function was taken from flowtop.c walk_process(...)
and refactored to look more generic.
Signed-off-by: Vadim Kochan <vadi...@gmail.com>
---
proc.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
proc.h | 1 +
2 files changed, 75 insertions(+)
diff --git a/proc.c b/proc.c
index 76e3c93..8119226 100644
--- a/proc.c
+++ b/proc.c
@@ -3,11 +3,13 @@
#endif
#include <sched.h>
#include <sys/wait.h>
+#include <sys/stat.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
+#include <dirent.h>
#include "proc.h"
#include "die.h"
@@ -83,6 +85,78 @@ ssize_t proc_get_cmdline(unsigned int pid, char *cmdline,
size_t len)
return ret;
}
+int __match_pid_by_inode(pid_t pid, ino_t ino)
+{
+ struct dirent *ent;
+ char path[1024];
+ DIR *dir;
+
+ if (snprintf(path, sizeof(path), "/proc/%u/fd", pid) == -1)
+ panic("giant process name! %u\n", pid);
+
+ dir = opendir(path);
+ if (!dir)
+ return -1;
+
+ while ((ent = readdir(dir))) {
+ struct stat statbuf;
+
+ if (snprintf(path, sizeof(path), "/proc/%u/fd/%s",
+ pid, ent->d_name) < 0)
+ continue;
+
+ if (stat(path, &statbuf) < 0)
+ continue;
+
+ if (S_ISSOCK(statbuf.st_mode) && ino == statbuf.st_ino) {
+ closedir(dir);
+ return 0;
+ }
+ }
+
+ closedir(dir);
+ return -1;
+}
+
+int proc_find_by_inode(ino_t ino, char *cmdline, size_t len, pid_t *pid)
+{
+ struct dirent *ent;
+ DIR *dir;
+
+ if (ino <= 0) {
+ cmdline[0] = '\0';
+ return 0;
+ }
+
+ dir = opendir("/proc");
+ if (!dir)
+ panic("Cannot open /proc: %s\n", strerror(errno));
+
+ while ((ent = readdir(dir))) {
+ int ret;
+ char *end;
+ const char *name = ent->d_name;
+ pid_t _pid = strtoul(name, &end, 10);
+
+ /* not a PID */
+ if (_pid == 0 && end == name)
+ continue;
+
+ ret = __match_pid_by_inode(_pid, ino);
+ if (!ret) {
+ ret = proc_get_cmdline(_pid, cmdline, len);
+ if (ret < 0)
+ panic("Failed to get process cmdline: %s\n",
strerror(errno));
+
+ *pid = _pid;
+ return ret;
+ }
+ }
+
+ closedir(dir);
+ return -1;
+}
+
int proc_exec(const char *proc, char *const argv[])
{
int status;
diff --git a/proc.h b/proc.h
index 9220b2a..6e5f3ac 100644
--- a/proc.h
+++ b/proc.h
@@ -8,5 +8,6 @@ extern int set_proc_prio(int prio);
extern int set_sched_status(int policy, int priority);
extern ssize_t proc_get_cmdline(unsigned int pid, char *cmdline, size_t len);
extern int proc_exec(const char *proc, char *const argv[]);
+extern int proc_find_by_inode(ino_t ino, char *cmdline, size_t len, pid_t
*pid);
#endif /* PROC_H */
--
2.10.2
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