diff options
| -rw-r--r-- | cursor/os-compatibility.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/cursor/os-compatibility.c b/cursor/os-compatibility.c index 07452a5..f2445ce 100644 --- a/cursor/os-compatibility.c +++ b/cursor/os-compatibility.c @@ -31,6 +31,7 @@ #include <unistd.h> #include <fcntl.h> #include <errno.h> +#include <signal.h> #include <string.h> #include <stdio.h> #include <stdlib.h> @@ -168,11 +169,28 @@ int os_resize_anonymous_file(int fd, off_t size) { #ifdef HAVE_POSIX_FALLOCATE + sigset_t mask; + sigset_t old_mask; + + /* + * posix_fallocate() might be interrupted, so we need to check + * for EINTR and retry in that case. + * However, in the presence of an alarm, the interrupt may trigger + * repeatedly and prevent a large posix_fallocate() to ever complete + * successfully, so we need to first block SIGALRM to prevent + * this. + */ + sigemptyset(&mask); + sigaddset(&mask, SIGALRM); + sigprocmask(SIG_BLOCK, &mask, &old_mask); /* - * Filesystems that do support fallocate will return EINVAL or + * Filesystems that do not support fallocate will return EINVAL or * EOPNOTSUPP. In this case we need to fall back to ftruncate */ - errno = posix_fallocate(fd, 0, size); + do { + errno = posix_fallocate(fd, 0, size); + } while (errno == EINTR); + sigprocmask(SIG_SETMASK, &old_mask, NULL); if (errno == 0) return 0; else if (errno != EINVAL && errno != EOPNOTSUPP) |