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Recognize ``-'' for stdout. allows piping output to tcpdump -r -

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This commit is contained in:
pooka 2010-08-12 18:22:40 +00:00
parent d5a83df798
commit 6461f6dd05
1 changed files with 8 additions and 4 deletions
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12
sys/rump/net/lib/libshmif/dumpbus.c
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@ -1,4 +1,4 @@
/* $NetBSD: dumpbus.c,v 1.4 2010/08/12 18:17:23 pooka Exp $ */
/* $NetBSD: dumpbus.c,v 1.5 2010/08/12 18:22:40 pooka Exp $ */
/*
* Little utility to convert shmif bus traffic to a pcap file
@ -83,9 +83,13 @@ main(int argc, char *argv[])
if (pcapfile) {
struct pcap_file_header phdr;
pfd = open(pcapfile, O_RDWR | O_CREAT, 0777);
if (pfd == -1)
err(1, "create pcap dump");
if (strcmp(pcapfile, "-") == 0) {
pfd = STDOUT_FILENO;
} else {
pfd = open(pcapfile, O_RDWR | O_CREAT, 0777);
if (pfd == -1)
err(1, "create pcap dump");
}
memset(&phdr, 0, sizeof(phdr));
phdr.magic = 0xa1b2c3d4; /* tcpdump magic */