From f2a8b20d9c63f771d1fddd639ea1ec3fe034dc6d Mon Sep 17 00:00:00 2001 From: Masatake YAMATO Date: Sun, 14 Apr 2024 01:40:14 +0900 Subject: [PATCH] lsns: tolerate lsns_ioctl(fd, NS_GET_{PARENT,USERNS}) failing with ENOSYS With the original code, "lsns/filedesc" test case failed on "build (qemu-user, s390x)" and "build (qemu-user, riscv64)". On the platforms, lsns_ioctl(fd, NS_GET_{PARENT,USERNS}) failed with ENOSYS. The error stoped the iteration for gathering information from /proc/[0-9]+. As a result, lsns printed nothing. We don't expect this behavior. Signed-off-by: Masatake YAMATO --- sys-utils/lsns.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/sys-utils/lsns.c b/sys-utils/lsns.c index 2c4ec9da0..8b70fd7cd 100644 --- a/sys-utils/lsns.c +++ b/sys-utils/lsns.c @@ -319,7 +319,11 @@ static int get_ns_ino(struct path_cxt *pc, const char *nsname, ino_t *ino, ino_t return -errno; if (strcmp(nsname, "pid") == 0 || strcmp(nsname, "user") == 0) { if ((pfd = lsns_ioctl(fd, NS_GET_PARENT)) < 0) { - if (errno == EPERM) + if (errno == EPERM + /* On the test platforms, "build (qemu-user, s390x)" and + * "build (qemu-user, riscv64)", the ioctl reported ENOSYS. + */ + || errno == ENOSYS) goto user; close(fd); return -errno; @@ -334,7 +338,11 @@ static int get_ns_ino(struct path_cxt *pc, const char *nsname, ino_t *ino, ino_t } user: if ((ofd = lsns_ioctl(fd, NS_GET_USERNS)) < 0) { - if (errno == EPERM) + if (errno == EPERM + /* On the test platforms, "build (qemu-user, s390x)" and + * "build (qemu-user, riscv64)", the ioctl reported ENOSYS. + */ + || errno == ENOSYS) goto out; close(fd); return -errno; -- 2.47.3