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Use pidfd_open for setns

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which is more efficient on newer kernel
This commit is contained in:
LoveSy 2024-04-09 14:19:38 +08:00 committed by John Wu
parent 941a363c5a
commit c6f0762510
1 changed files with 15 additions and 9 deletions
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24
native/src/base/misc.cpp
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@ -208,16 +208,22 @@ uint32_t binary_gcd(uint32_t u, uint32_t v) {
} }
int switch_mnt_ns(int pid) { int switch_mnt_ns(int pid) {
char mnt[32]; int ret = -1;
ssprintf(mnt, sizeof(mnt), "/proc/%d/ns/mnt", pid); int fd = syscall(__NR_pidfd_open, pid, 0);
if (access(mnt, R_OK) == -1) return 1; // Maybe process died.. if (fd > 0) {
ret = setns(fd, CLONE_NEWNS);
close(fd);
}
if (ret < 0) {
char mnt[32];
ssprintf(mnt, sizeof(mnt), "/proc/%d/ns/mnt", pid);
fd = open(mnt, O_RDONLY);
if (fd < 0) return 1; // Maybe process died..
int fd, ret; // Switch to its namespace
fd = xopen(mnt, O_RDONLY); ret = xsetns(fd, 0);
if (fd < 0) return 1; close(fd);
// Switch to its namespace }
ret = xsetns(fd, 0);
close(fd);
return ret; return ret;
} }