diff options
Diffstat (limited to 'src/platform/posix/posix_file.c')
| -rw-r--r-- | src/platform/posix/posix_file.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/src/platform/posix/posix_file.c b/src/platform/posix/posix_file.c index 83d045fa..b1da3cd5 100644 --- a/src/platform/posix/posix_file.c +++ b/src/platform/posix/posix_file.c @@ -22,6 +22,11 @@ #include <sys/types.h> #include <unistd.h> +// Some systems -- Android -- have BSD flock but not POSIX lockf. +#if defined(NNG_HAVE_FLOCK) && !defined(NNG_HAVE_LOCKF) +#include <sys/file.h> +#endif + // File support. static int @@ -264,10 +269,22 @@ int nni_plat_file_lock(const char *path, nni_plat_flock *lk) { int fd; + int rv; if ((fd = open(path, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) < 0) { return (nni_plat_errno(errno)); } - if (lockf(fd, F_TLOCK, 0) < 0) { +#ifdef NNG_HAVE_LOCKF + rv = lockf(fd, F_TLOCK, 0); +#elif defined NNG_HAVE_FLOCK + rv = flock(fd, LOCK_EX | LOCK_NB); +#else + // We don't have locking support. This means you live dangerously. + // For example, ZeroTier cannot be sure that nothing else is using + // the same configuration file. If you're here, its probably an + // embedded scenario, and we can live with it. + rv = 0; +#endif + if (rv < 0) { int rv = errno; close(fd); if (rv == EAGAIN) { |