diff options
| -rw-r--r-- | configure.ac | 3 | ||||
| -rw-r--r-- | fish/alloc.c | 19 |
2 files changed, 22 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index b13eaf9b..cfad704f 100644 --- a/configure.ac +++ b/configure.ac @@ -134,6 +134,9 @@ AC_DEFINE_UNQUOTED([host_cpu],["$host_cpu"],[Host architecture.]) dnl Headers. AC_CHECK_HEADERS([errno.h sys/types.h sys/un.h sys/wait.h sys/socket.h endian.h byteswap.h]) +dnl Functions. +AC_CHECK_FUNCS([posix_fallocate]) + dnl Build the daemon? AC_MSG_CHECKING([if we should build the daemon]) AC_ARG_ENABLE([daemon], diff --git a/fish/alloc.c b/fish/alloc.c index ad2dccc2..28c990f1 100644 --- a/fish/alloc.c +++ b/fish/alloc.c @@ -54,12 +54,31 @@ do_alloc (const char *cmd, int argc, char *argv[]) return -1; } +#ifdef HAVE_POSIX_FALLOCATE if (posix_fallocate (fd, 0, size) == -1) { perror ("fallocate"); close (fd); unlink (argv[0]); return -1; } +#else + /* Slow emulation of posix_fallocate on platforms which don't have it. */ + char buffer[BUFSIZ]; + memset (buffer, 0, sizeof buffer); + + size_t remaining = size; + while (remaining > 0) { + size_t n = remaining > sizeof buffer ? sizeof buffer : remaining; + ssize_t r = write (fd, buffer, n); + if (r == -1) { + perror ("write"); + close (fd); + unlink (argv[0]); + return -1; + } + remaining -= r; + } +#endif if (close (fd) == -1) { perror (argv[0]); |