diff options
Diffstat (limited to 'man2/msgop.2')
| -rw-r--r-- | man2/msgop.2 | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/man2/msgop.2 b/man2/msgop.2 index ee4f11419..55e78ddc2 100644 --- a/man2/msgop.2 +++ b/man2/msgop.2 @@ -553,7 +553,7 @@ The following shell session shows a sample run of the program: .EX .RB "$" " ./a.out \-s" sent: a message at Wed Mar 4 16:25:45 2015 - +.PP .RB "$" " ./a.out \-r" message received: a message at Wed Mar 4 16:25:45 2015 .EE @@ -569,18 +569,18 @@ message received: a message at Wed Mar 4 16:25:45 2015 #include <sys/msg.h> #include <time.h> #include <unistd.h> - +\& struct msgbuf { long mtype; char mtext[80]; }; - +\& static void usage(char *prog_name, char *msg) { if (msg != NULL) fputs(msg, stderr); - +\& fprintf(stderr, "Usage: %s [options]\en", prog_name); fprintf(stderr, "Options are:\en"); fprintf(stderr, "\-s send message using msgsnd()\en"); @@ -589,19 +589,19 @@ usage(char *prog_name, char *msg) fprintf(stderr, "\-k message queue key (default is 1234)\en"); exit(EXIT_FAILURE); } - +\& static void send_msg(int qid, int msgtype) { time_t t; struct msgbuf msg; - +\& msg.mtype = msgtype; - +\& time(&t); snprintf(msg.mtext, sizeof(msg.mtext), "a message at %s", ctime(&t)); - +\& if (msgsnd(qid, &msg, sizeof(msg.mtext), IPC_NOWAIT) == \-1) { @@ -610,12 +610,12 @@ send_msg(int qid, int msgtype) } printf("sent: %s\en", msg.mtext); } - +\& static void get_msg(int qid, int msgtype) { struct msgbuf msg; - +\& if (msgrcv(qid, &msg, sizeof(msg.mtext), msgtype, MSG_NOERROR | IPC_NOWAIT) == \-1) { if (errno != ENOMSG) { @@ -627,7 +627,7 @@ get_msg(int qid, int msgtype) printf("message received: %s\en", msg.mtext); } } - +\& int main(int argc, char *argv[]) { @@ -635,7 +635,7 @@ main(int argc, char *argv[]) int mode = 0; /* 1 = send, 2 = receive */ int msgtype = 1; int msgkey = 1234; - +\& while ((opt = getopt(argc, argv, "srt:k:")) != \-1) { switch (opt) { case \[aq]s\[aq]: @@ -656,22 +656,22 @@ main(int argc, char *argv[]) usage(argv[0], "Unrecognized option\en"); } } - +\& if (mode == 0) usage(argv[0], "must use either \-s or \-r option\en"); - +\& qid = msgget(msgkey, IPC_CREAT | 0666); - +\& if (qid == \-1) { perror("msgget"); exit(EXIT_FAILURE); } - +\& if (mode == 2) get_msg(qid, msgtype); else send_msg(qid, msgtype); - +\& exit(EXIT_SUCCESS); } .EE |