lib/procutils: add proc_get_cmdline()

Signed-off-by: Karel Zak <kzak@redhat.com>

2 files changed, 32 insertions, 0 deletions

diff --git a/include/procutils.h b/include/procutils.h
index 14b766cb7..3040d197b 100644
--- a/include/procutils.h
+++ b/include/procutils.h
@@ -28,5 +28,6 @@ extern void proc_processes_filter_by_name(struct proc_processes *ps, const char
 extern void proc_processes_filter_by_uid(struct proc_processes *ps, uid_t uid);
 extern int proc_next_pid(struct proc_processes *ps, pid_t *pid);
 
+extern char *proc_get_command(pid_t pid);
 
 #endif /* UTIL_LINUX_PROCUTILS */
diff --git a/lib/procutils.c b/lib/procutils.c
index 1823d16b1..00b977c5a 100644
--- a/lib/procutils.c
+++ b/lib/procutils.c
@@ -24,6 +24,7 @@
 
 #include "procutils.h"
 #include "at.h"
+#include "all-io.h"
 #include "c.h"
 
 /*
@@ -96,6 +97,36 @@ int proc_next_tid(struct proc_tasks *tasks, pid_t *tid)
 	return 0;
 }
 
+/* returns process command name, use free() for result */
+char *proc_get_command(pid_t pid)
+{
+	char buf[BUFSIZ], *res = NULL;
+	ssize_t sz = 0;
+	size_t i;
+	int fd = -1;
+
+	snprintf(buf, sizeof(buf), "/proc/%d/cmdline", (int) pid);
+	fd = open(buf, O_RDONLY);
+	if (fd < 0)
+		goto done;
+
+	sz = read_all(fd, buf, sizeof(buf));
+	if (sz <= 0)
+		goto done;
+
+	for (i = 0; i < (size_t) sz; i++) {
+
+		if (buf[i] == '\0')
+			buf[i] = ' ';
+	}
+	buf[sz - 1] = '\0';
+	res = strdup(buf);
+done:
+	if (fd >= 0)
+		close(fd);
+	return res;
+}
+
 struct proc_processes *proc_open_processes(void)
 {
 	struct proc_processes *ps;