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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, by default) using specific input and output blocksizes,
while optionally performing conversions on it. 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 config CONFIG_DF
bool "df" bool "df"
default n default n

33
coreutils/dd.c
View File

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