diff options
Diffstat (limited to 'wrapper.c')
| -rw-r--r-- | wrapper.c | 47 |
1 files changed, 29 insertions, 18 deletions
@@ -227,6 +227,24 @@ int xopen(const char *path, int oflag, ...) } } +static int handle_nonblock(int fd, short poll_events, int err) +{ + struct pollfd pfd; + + if (err != EAGAIN && err != EWOULDBLOCK) + return 0; + + pfd.fd = fd; + pfd.events = poll_events; + + /* + * no need to check for errors, here; + * a subsequent read/write will detect unrecoverable errors + */ + poll(&pfd, 1, -1); + return 1; +} + /* * xread() is the same a read(), but it automatically restarts read() * operations with a recoverable error (EAGAIN and EINTR). xread() @@ -242,20 +260,8 @@ ssize_t xread(int fd, void *buf, size_t len) if (nr < 0) { if (errno == EINTR) continue; - if (errno == EAGAIN || errno == EWOULDBLOCK) { - struct pollfd pfd; - pfd.events = POLLIN; - pfd.fd = fd; - /* - * it is OK if this poll() failed; we - * want to leave this infinite loop - * only when read() returns with - * success, or an expected failure, - * which would be checked by the next - * call to read(2). - */ - poll(&pfd, 1, -1); - } + if (handle_nonblock(fd, POLLIN, errno)) + continue; } return nr; } @@ -273,8 +279,13 @@ ssize_t xwrite(int fd, const void *buf, size_t len) len = MAX_IO_SIZE; while (1) { nr = write(fd, buf, len); - if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) - continue; + if (nr < 0) { + if (errno == EINTR) + continue; + if (handle_nonblock(fd, POLLOUT, errno)) + continue; + } + return nr; } } @@ -555,7 +566,7 @@ static int warn_if_unremovable(const char *op, const char *file, int rc) if (!rc || errno == ENOENT) return 0; err = errno; - warning("unable to %s %s: %s", op, file, strerror(errno)); + warning_errno("unable to %s %s", op, file); errno = err; return rc; } @@ -591,7 +602,7 @@ int remove_or_warn(unsigned int mode, const char *file) void warn_on_inaccessible(const char *path) { - warning(_("unable to access '%s': %s"), path, strerror(errno)); + warning_errno(_("unable to access '%s'"), path); } static int access_error_is_ok(int err, unsigned flag) |