Always check the return value of the write() system call

dtach was assuming that writes with a small byte count could never fail,
and was not handling partial writes for larger byte counts in a few
places.

This should also suppress unused result warnings from gcc on systems
that define _FORTIFY_SOURCE by default.

1 files changed, 3 insertions, 0 deletions

diff --git a/dtach.h b/dtach.h
index 56867c8..fd6b59c 100644
--- a/dtach.h
+++ b/dtach.h
@@ -139,6 +139,9 @@ struct packet
 /* This hopefully moves to the bottom of the screen */
 #define EOS "\033[999H"
 
+void write_buf_or_fail(int fd, const void *buf, size_t count);
+void write_packet_or_fail(int fd, const struct packet *pkt);
+
 int attach_main(int noerror);
 int master_main(char **argv, int waitattach, int dontfork);
 int push_main(void);