[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2 1/2] util: Introduce qemu_get_pid_name
From: |
Michal Privoznik |
Subject: |
[Qemu-devel] [PATCH v2 1/2] util: Introduce qemu_get_pid_name |
Date: |
Wed, 21 Sep 2016 13:26:02 +0200 |
This is a small helper that tries to fetch binary name for given
PID.
Signed-off-by: Michal Privoznik <address@hidden>
---
include/qemu/osdep.h | 10 ++++++++++
util/oslib-posix.c | 37 +++++++++++++++++++++++++++++++++++++
util/oslib-win32.c | 7 +++++++
3 files changed, 54 insertions(+)
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 9e9fa61..384bfe2 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -388,6 +388,16 @@ void os_mem_prealloc(int fd, char *area, size_t sz, Error
**errp);
int qemu_read_password(char *buf, int buf_size);
/**
+ * qemu_get_pid_name:
+ * @pid: pid of a process
+ *
+ * For given @pid fetch its name. Caller is responsible for
+ * freeing the string when no longer needed.
+ * Returns allocated string on success, NULL on failure.
+ */
+char *qemu_get_pid_name(pid_t pid);
+
+/**
* qemu_fork:
*
* A version of fork that avoids signal handler race
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index f2d4e9e..0555425 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -46,6 +46,7 @@
#ifdef __FreeBSD__
#include <sys/sysctl.h>
+#include <libutil.h>
#endif
#include "qemu/mmap-alloc.h"
@@ -430,6 +431,42 @@ int qemu_read_password(char *buf, int buf_size)
}
+char *qemu_get_pid_name(pid_t pid)
+{
+ char *name = NULL;
+ char *pid_path;
+ char buf[PATH_MAX];
+ size_t len;
+
+#if defined(__FreeBSD__)
+ /* BSDs don't have /proc, but they provide a nice substitute */
+ struct kinfo_proc *proc = kinfo_getproc(pid);
+ if (proc) {
+ name = g_strdup(proc->ki_comm);
+ free(proc);
+ }
+#else
+ /* Assume a system with reasonable procfs */
+ FILE *f;
+
+ pid_path = g_strdup_printf("/proc/%d/cmdline", pid);
+ f = fopen(pid_path, "r");
+ if (!f) {
+ return NULL;
+ }
+
+ len = fread(buf, 1, sizeof(buf), f);
+ if (len) {
+ name = g_strdup(buf);
+ }
+ fclose(f);
+
+#endif
+
+ return name;
+}
+
+
pid_t qemu_fork(Error **errp)
{
sigset_t oldmask, newmask;
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 4c1dcf1..d09863c 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -575,6 +575,13 @@ int qemu_read_password(char *buf, int buf_size)
}
+char *qemu_get_pid_name(pid_t pid)
+{
+ /* XXX Implement me */
+ abort();
+}
+
+
pid_t qemu_fork(Error **errp)
{
errno = ENOSYS;
--
2.8.4