diff options
Diffstat (limited to 'bin/cat/cat.c')
| -rw-r--r-- | bin/cat/cat.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/bin/cat/cat.c b/bin/cat/cat.c index 69c56c0..9e12d3e 100644 --- a/bin/cat/cat.c +++ b/bin/cat/cat.c @@ -64,7 +64,7 @@ __FBSDID("$FreeBSD$"); #include <string.h> #include <unistd.h> -static int bflag, eflag, nflag, sflag, tflag, vflag; +static int bflag, eflag, lflag, nflag, sflag, tflag, vflag; static int rval; static const char *filename; @@ -96,10 +96,11 @@ int main(int argc, char *argv[]) { int ch; + struct flock stdout_lock; setlocale(LC_CTYPE, ""); - while ((ch = getopt(argc, argv, "benstuv")) != -1) + while ((ch = getopt(argc, argv, "belnstuv")) != -1) switch (ch) { case 'b': bflag = nflag = 1; /* -b implies -n */ @@ -107,6 +108,9 @@ main(int argc, char *argv[]) case 'e': eflag = vflag = 1; /* -e implies -v */ break; + case 'l': + lflag = 1; + break; case 'n': nflag = 1; break; @@ -127,6 +131,15 @@ main(int argc, char *argv[]) } argv += optind; + if (lflag) { + stdout_lock.l_len = 0; + stdout_lock.l_start = 0; + stdout_lock.l_type = F_WRLCK; + stdout_lock.l_whence = SEEK_SET; + if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1) + err(EXIT_FAILURE, "stdout"); + } + if (bflag || eflag || nflag || sflag || tflag || vflag) scanfiles(argv, 1); else @@ -140,7 +153,7 @@ main(int argc, char *argv[]) static void usage(void) { - fprintf(stderr, "usage: cat [-benstuv] [file ...]\n"); + fprintf(stderr, "usage: cat [-belnstuv] [file ...]\n"); exit(1); /* NOTREACHED */ } |
