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authorDenis Vlasenko <vda.linux@googlemail.com>2007-05-26 16:44:20 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-05-26 16:44:20 +0000
commit5a6aeddfa7262e41802c77f70c9ef88e9c2c2476 (patch)
tree36bf70fe7e6c67e4ab37c446a191272eb90097ed /networking
parent6239b1f50a04121d96daba2cdc2f7c3765c9007b (diff)
downloadbusybox-5a6aeddfa7262e41802c77f70c9ef88e9c2c2476.tar.gz
xpipe: introduce (saves ~170 bytes)
udhcp/signalpipe.c: use pipe instead of socketpair.
Diffstat (limited to 'networking')
-rw-r--r--networking/udhcp/signalpipe.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/networking/udhcp/signalpipe.c b/networking/udhcp/signalpipe.c
index d52a931a9..9c7ead965 100644
--- a/networking/udhcp/signalpipe.c
+++ b/networking/udhcp/signalpipe.c
@@ -27,7 +27,8 @@ static int signal_pipe[2];
static void signal_handler(int sig)
{
- if (send(signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0)
+ unsigned char ch = sig; /* use char, avoid dealing with partial writes */
+ if (write(signal_pipe[1], &ch, 1) != 1)
bb_perror_msg("cannot send signal");
}
@@ -36,11 +37,11 @@ static void signal_handler(int sig)
* and installs the signal handler */
void udhcp_sp_setup(void)
{
-// BTW, why socketpair and not just pipe?
- if (socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe))
- bb_perror_msg_and_die("socketpair");
+ /* was socketpair, but it needs AF_UNIX in kernel */
+ xpipe(signal_pipe);
fcntl(signal_pipe[0], F_SETFD, FD_CLOEXEC);
fcntl(signal_pipe[1], F_SETFD, FD_CLOEXEC);
+ fcntl(signal_pipe[1], F_SETFL, O_NONBLOCK);
signal(SIGUSR1, signal_handler);
signal(SIGUSR2, signal_handler);
signal(SIGTERM, signal_handler);
@@ -67,12 +68,12 @@ int udhcp_sp_fd_set(fd_set *rfds, int extra_fd)
* your signal on success */
int udhcp_sp_read(fd_set *rfds)
{
- int sig;
+ unsigned char sig;
if (!FD_ISSET(signal_pipe[0], rfds))
return 0;
- if (read(signal_pipe[0], &sig, sizeof(sig)) < 0)
+ if (read(signal_pipe[0], &sig, 1) != 1)
return -1;
return sig;