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Patch from Jason Schoon to add optional SIGUSR1 support to dd.

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This commit is contained in:
Rob Landley 2006-05-02 22:44:04 +00:00
parent 67d5b8b5b1
commit c5598177bc
2 changed files with 37 additions and 8 deletions
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12
coreutils/Config.in
View File

@ -115,6 +115,18 @@ config CONFIG_DD
by default) using specific input and output blocksizes,
while optionally performing conversions on it.
config CONFIG_FEATURE_DD_SIGNAL_HANDLING
bool "Enable DD signal handling for status reporting"
default y
depends on CONFIG_DD
help
sending a SIGUSR1 signal to a running `dd' process makes it
print to standard error the number of records read and written
so far, then to resume copying.
$ dd if=/dev/zero of=/dev/null& pid=$! $ kill -USR1 $pid; sleep 1; kill $pid
10899206+0 records in 10899206+0 records out
config CONFIG_DF
bool "df"
default n

33
coreutils/dd.c
View File

@ -15,9 +15,9 @@
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h> // For FEATURE_DD_SIGNAL_HANDLING
#include "busybox.h"
static const struct suffix_mult dd_suffixes[] = {
{ "c", 1 },
{ "w", 2 },
@ -31,12 +31,20 @@ static const struct suffix_mult dd_suffixes[] = {
{ NULL, 0 }
};
static size_t out_full;
static size_t out_part;
static size_t in_full;
static size_t in_part;
static void dd_output_status(int cur_signal)
{
fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n",
(long)in_full, (long)in_part,
(long)out_full, (long)out_part);
}
int dd_main(int argc, char **argv)
{
size_t out_full = 0;
size_t out_part = 0;
size_t in_full = 0;
size_t in_part = 0;
size_t count = -1;
size_t bs = 512;
ssize_t n;
@ -53,6 +61,17 @@ int dd_main(int argc, char **argv)
const char *outfile = NULL;
char *buf;
if (ENABLE_FEATURE_DD_SIGNAL_HANDLING)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = dd_output_status;
sa.sa_flags = SA_RESTART;
sigemptyset(&sa.sa_mask);
sigaction(SIGUSR1, &sa, 0);
}
for (i = 1; i < argc; i++) {
if (strncmp("bs=", argv[i], 3) == 0)
bs = bb_xparse_number(argv[i]+3, dd_suffixes);
@ -180,9 +199,7 @@ int dd_main(int argc, char **argv)
bb_perror_msg_and_die("%s", outfile);
}
fprintf(stderr, "%ld+%ld records in\n%ld+%ld records out\n",
(long)in_full, (long)in_part,
(long)out_full, (long)out_part);
dd_output_status(0);
return EXIT_SUCCESS;
}