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Add output truncation flag

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This commit adds a "truncate" flag that can be added to a service
description between the "tty" keyword and the path string.

If the flag is set, the output file is truncated to 0 after opening.

This probably requires some remodeling in the future as the tty keyword
no longer deals with just tty devices.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
This commit is contained in:
David Oberhollenzer 2018-07-22 17:57:13 +02:00
parent 8718c31928
commit 056d3c8e64
3 changed files with 22 additions and 5 deletions
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13
cmd/runsvc/runsvc.c
View file

@ -17,17 +17,20 @@
*/
#include "runsvc.h"
static int setup_tty(const char *ctty)
static int setup_tty(service_t *svc)
{
int fd;
if (ctty != NULL) {
fd = open(ctty, O_RDWR);
if (svc->ctty != NULL) {
fd = open(svc->ctty, O_RDWR);
if (fd < 0) {
perror(ctty);
perror(svc->ctty);
return -1;
}
if (svc->flags & SVC_FLAG_TRUNCATE_OUT)
ftruncate(fd, 0);
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
@ -125,7 +128,7 @@ int main(int argc, char **argv)
if (initenv())
goto out;
if (setup_tty(svc->ctty))
if (setup_tty(svc))
goto out;
if (svc->exec->next == NULL)

6
lib/include/service.h
View file

@ -51,6 +51,11 @@ enum {
RDSVC_NO_DEPS = 0x08, /* do not store dependencies */
};
enum {
/* truncate stdout */
SVC_FLAG_TRUNCATE_OUT = 0x01,
};
typedef struct exec_t {
struct exec_t *next;
int argc; /* number of elements in argument vector */
@ -67,6 +72,7 @@ typedef struct service_t {
char *desc; /* description string */
char *ctty; /* controlling tty or log file */
int rspwn_limit; /* maximum respawn count */
unsigned int flags; /* SVC_FLAG_* bit field */
/* linked list of command lines to execute */
exec_t *exec;

8
lib/util/rdsvc.c
View file

@ -70,8 +70,16 @@ static int svc_desc(service_t *svc, char *arg, rdline_t *rd)
static int svc_tty(service_t *svc, char *arg, rdline_t *rd)
{
if (strncmp(arg, "truncate", 8) == 0 && isspace(arg[8])) {
svc->flags |= SVC_FLAG_TRUNCATE_OUT;
arg += 8;
while (isspace(*arg))
++arg;
}
if (try_unescape(arg, rd))
return -1;
svc->ctty = try_strdup(arg, rd);
return svc->ctty == NULL ? -1 : 0;
}