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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-04-22 10:00:25 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-04-22 10:00:25 +0200 |
| commit | 6cd7a2c6dac333e33aa49c280359da9805f7141d (patch) | |
| tree | 1412caa7f1b1c841fa110ea2b4a1b5f27cfa4663 | |
| parent | 03117dc0dbf8982b673a47ca3b88936b5fea227e (diff) | |
| download | man-pages-6cd7a2c6dac333e33aa49c280359da9805f7141d.tar.gz | |
cmsg.3: Minor cosmetic changes to example code
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man3/cmsg.3 | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/man3/cmsg.3 b/man3/cmsg.3 index 16f78aad33..45571ca260 100644 --- a/man3/cmsg.3 +++ b/man3/cmsg.3 @@ -173,8 +173,9 @@ int *ttlptr; int received_ttl; /* Receive auxiliary data in msgh */ + for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; - cmsg = CMSG_NXTHDR(&msgh,cmsg)) { + cmsg = CMSG_NXTHDR(&msgh, cmsg)) { if (cmsg\->cmsg_level == IPPROTO_IP && cmsg\->cmsg_type == IP_TTL) { ttlptr = (int *) CMSG_DATA(cmsg); @@ -182,11 +183,9 @@ for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; break; } } + if (cmsg == NULL) { - /* - * Error: IP_TTL not enabled or small buffer - * or I/O error. - */ + /* Error: IP_TTL not enabled or small buffer or I/O error */ } .fi .in @@ -199,14 +198,13 @@ UNIX domain socket using .nf struct msghdr msg = {0}; struct cmsghdr *cmsg; -int myfds[NUM_FD]; /* Contains the file descriptors to pass. */ -union { - /* ancillary data buffer, wrapped in a union in order to ensure - it is suitably aligned */ +int myfds[NUM_FD]; /* Contains the file descriptors to pass */ +int *fdptr; +union { /* Ancillary data buffer, wrapped in a union + in order to ensure it is suitably aligned */ char buf[CMSG_SPACE(sizeof myfds)]; struct cmsghdr align; } u; -int *fdptr; msg.msg_control = u.buf; msg.msg_controllen = sizeof u.buf; @@ -214,8 +212,7 @@ cmsg = CMSG_FIRSTHDR(&msg); cmsg\->cmsg_level = SOL_SOCKET; cmsg\->cmsg_type = SCM_RIGHTS; cmsg\->cmsg_len = CMSG_LEN(sizeof(int) * NUM_FD); -/* Initialize the payload: */ -fdptr = (int *) CMSG_DATA(cmsg); +fdptr = (int *) CMSG_DATA(cmsg); /* Initialize the payload */ memcpy(fdptr, myfds, NUM_FD * sizeof(int)); .fi .in |