[dpdk-dev] [PATCH] test: fix process dup fd close

[<kkanas@marvell.com>]

From: Krzysztof Kanas <kkanas@marvell.com>

process_dup was intending to close it's own fd's but failed to do so

Fixes: af75078fece3 ("first public release")

Signed-off-by: Krzysztof Kanas <kkanas@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/14906
Reviewed-by: Amit Gupta <agupta3@marvell.com>
Reviewed-by: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
Tested-by: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
---
 app/test/process.h | 40 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 5 deletions(-)

diff --git a/app/test/process.h b/app/test/process.h
index 128ce41219a1..2a6428f104e1 100644
--- a/app/test/process.h
+++ b/app/test/process.h
@@ -11,6 +11,7 @@
 #include <stdlib.h> /* NULL */
 #include <string.h> /* strerror */
 #include <unistd.h> /* readlink */
+#include <dirent.h>
 #include <sys/wait.h>
 
 #include <rte_string_fns.h> /* strlcpy */
@@ -40,8 +41,12 @@ process_dup(const char *const argv[], int numargs, const char *env_value)
 {
 	int num;
 	char *argv_cpy[numargs + 1];
-	int i, fd, status;
+	int i, fd, fdir, status;
+	struct dirent *dirent = NULL;
+	const char *procdir = "/proc/self/fd/";
 	char path[32];
+	char *endptr;
+	DIR *dir = NULL;
 #ifdef RTE_LIBRTE_PDUMP
 	pthread_t thread;
 #endif
@@ -58,11 +63,36 @@ process_dup(const char *const argv[], int numargs, const char *env_value)
 
 		/* close all open file descriptors, check /proc/self/fd to only
 		 * call close on open fds. Exclude fds 0, 1 and 2*/
-		for (fd = getdtablesize(); fd > 2; fd-- ) {
-			snprintf(path, sizeof(path), "/proc/" exe "/fd/%d", fd);
-			if (access(path, F_OK) == 0)
-				close(fd);
+		dir = opendir(procdir);
+
+		if (dir == NULL) {
+			rte_panic("Error opening %s: %s\n", procdir,
+					strerror(errno));
+		}
+
+		fdir = dirfd(dir);
+		if (fdir < 0) {
+			status = errno;
+			closedir(dir);
+			rte_panic("Error %d obtaining fd for dir %s: %s\n",
+					fdir, procdir, strerror(status));
 		}
+
+		while ((dirent = readdir(dir)) != NULL) {
+			errno = 0;
+			fd = strtol(dirent->d_name, &endptr, 10);
+			if (errno != 0 || dirent->d_name == endptr) {
+				printf("Error converint name fd %d %s:\n",
+					fd, dirent->d_name);
+				continue;
+			}
+
+			if (fd == fdir || fd <= 2)
+				continue;
+
+			close(fd);
+		}
+
 		printf("Running binary with argv[]:");
 		for (i = 0; i < num; i++)
 			printf("'%s' ", argv_cpy[i]);
-- 
2.21.0