This wrapper just restarts on EINTR, but not on EAGAIN like xread does. This gives less guarantees on the actual reading rather than on returning fast. Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx> --- git-compat-util.h | 1 + wrapper.c | 22 ++++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/git-compat-util.h b/git-compat-util.h index c6d391f..9ccea85 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -718,6 +718,7 @@ extern void *xcalloc(size_t nmemb, size_t size); extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset); extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset); extern ssize_t xread(int fd, void *buf, size_t len); +extern ssize_t xread_nonblock(int fd, void *buf, size_t len); extern ssize_t xwrite(int fd, const void *buf, size_t len); extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset); extern int xdup(int fd); diff --git a/wrapper.c b/wrapper.c index 50267a4..54ce231 100644 --- a/wrapper.c +++ b/wrapper.c @@ -223,6 +223,28 @@ ssize_t xread(int fd, void *buf, size_t len) } /* + * xread_nonblock() is the same a read(), but it automatically restarts read() + * interrupted operations (EINTR). xread_nonblock() DOES NOT GUARANTEE that + * "len" bytes is read even if the data is available. + */ +ssize_t xread_nonblock(int fd, void *buf, size_t len) +{ + ssize_t nr; + if (len > MAX_IO_SIZE) + len = MAX_IO_SIZE; + while (1) { + nr = read(fd, buf, len); + if (nr < 0) { + if (errno == EINTR) + continue; + if (errno == EWOULDBLOCK) + errno = EAGAIN; + } + return nr; + } +} + +/* * xwrite() is the same a write(), but it automatically restarts write() * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT * GUARANTEE that "len" bytes is written even if the operation is successful. -- 2.5.0.275.ge015d2a -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html