From 7815904f1136339d47329a3871d9939eac34f830 Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Tue, 13 Jan 2015 00:39:10 +0100 Subject: doc: add example C code to read status socket --- doc/examples/status.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 doc/examples/status.c (limited to 'doc/examples') diff --git a/doc/examples/status.c b/doc/examples/status.c new file mode 100644 index 0000000..7f0e46e --- /dev/null +++ b/doc/examples/status.c @@ -0,0 +1,51 @@ +#include +#include +#include +#include + +#include +#include + + +int main(int argc, char *argv[]) { + if (argc != 2) { + fprintf(stderr, "Usage: %s \n", argv[0]); + return 1; + } + + size_t addrlen = strlen(argv[1]); + + /* Allocate enough space for arbitrary-length paths */ + char addrbuf[offsetof(struct sockaddr_un, sun_path) + addrlen + 1]; + memset(addrbuf, 0, sizeof(addrbuf)); + + struct sockaddr_un *addr = (struct sockaddr_un *)addrbuf; + addr->sun_family = AF_UNIX; + memcpy(addr->sun_path, argv[1], addrlen+1); + + int fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (fd < 0) { + fprintf(stderr, "Failed to create socket: %s\n", strerror(errno)); + return 1; + } + + if (connect(fd, (struct sockaddr*)addr, sizeof(addrbuf)) < 0) { + fprintf(stderr, "Can't connect to `%s': %s\n", argv[1], strerror(errno)); + return 1; + } + + char buf[1024]; + ssize_t r; + while (1) { + r = recv(fd, buf, sizeof(buf), 0); + if (r < 0) { + fprintf(stderr, "read: %s\n", strerror(errno)); + return 1; + } + + if (r == 0) + return 0; + + fwrite(buf, r, 1, stdout); + } +} -- cgit v1.2.3