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authorGravatar Erik Andersen <andersen@codepoet.org>2000-04-15 16:34:54 +0000
committerGravatar Erik Andersen <andersen@codepoet.org>2000-04-15 16:34:54 +0000
commit5e1189e187f6a7957dadb8eda2c271c4a0777a23 (patch)
tree140cd30d77342c730afbc1df863bec93c63978a8 /miscutils/mt.c
parent95c1c1e05f290ccbcc2ff863a62bcee5d57bf5c8 (diff)
downloadbusybox-5e1189e187f6a7957dadb8eda2c271c4a0777a23.tar.gz
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More documentation updates, and minor fixes to make things sync
up with the docs. -Erik
Diffstat (limited to 'miscutils/mt.c')
-rw-r--r--miscutils/mt.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/miscutils/mt.c b/miscutils/mt.c
index 9791b64b2..cf20d1711 100644
--- a/miscutils/mt.c
+++ b/miscutils/mt.c
@@ -4,7 +4,8 @@
#include <sys/mtio.h>
#include <sys/fcntl.h>
-static const char mt_usage[] = "mt [-f device] opcode value\n";
+static const char mt_usage[] = "mt [-f device] opcode value\n\n"
+ "Control magnetic tape drive operation\n";
struct mt_opcodes {
char *name;
@@ -56,6 +57,10 @@ extern int mt_main(int argc, char **argv)
const struct mt_opcodes *code = opcodes;
struct mtop op;
int fd;
+
+ if ((argc != 2 && argc != 3) || **(argv + 1) == '-') {
+ usage(mt_usage);
+ }
if (strcmp(argv[1], "-f") == 0) {
if (argc < 4) {
@@ -74,7 +79,7 @@ extern int mt_main(int argc, char **argv)
if (code->name == 0) {
fprintf(stderr, "mt: unrecognized opcode %s.\n", argv[1]);
- return (FALSE);
+ exit (FALSE);
}
op.mt_op = code->value;
@@ -85,13 +90,13 @@ extern int mt_main(int argc, char **argv)
if ((fd = open(file, O_RDONLY, 0)) < 0) {
perror(file);
- return (FALSE);
+ exit (FALSE);
}
if (ioctl(fd, MTIOCTOP, &op) != 0) {
perror(file);
- return (FALSE);
+ exit (FALSE);
}
- return (TRUE);
+ exit (TRUE);
}