diff options
Diffstat (limited to 'runit')
| -rw-r--r-- | runit/svlogd.c | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/runit/svlogd.c b/runit/svlogd.c index 4458bd7..db3d4c5 100644 --- a/runit/svlogd.c +++ b/runit/svlogd.c @@ -206,17 +206,22 @@ static void fmt_time_bernstein_25(char *s) bin2hex(s, (char*)pack, 12); } -static unsigned processorstart(struct logdir *ld) +static void processorstart(struct logdir *ld) { + char sv_ch; int pid; - if (!ld->processor) return 0; + if (!ld->processor) return; if (ld->ppid) { warnx("processor already running", ld->name); - return 0; + return; } - while ((pid = fork()) == -1) - pause2cannot("fork for processor", ld->name); + + /* vfork'ed child trashes this byte, save... */ + sv_ch = ld->fnsave[26]; + + while ((pid = vfork()) == -1) + pause2cannot("vfork for processor", ld->name); if (!pid) { char *prog[4]; int fd; @@ -235,7 +240,7 @@ static unsigned processorstart(struct logdir *ld) bb_error_msg(INFO"processing: %s/%s", ld->name, ld->fnsave); fd = xopen(ld->fnsave, O_RDONLY|O_NDELAY); xmove_fd(fd, 0); - ld->fnsave[26] = 't'; + ld->fnsave[26] = 't'; /* <- that's why we need sv_ch! */ fd = xopen(ld->fnsave, O_WRONLY|O_NDELAY|O_TRUNC|O_CREAT); xmove_fd(fd, 1); fd = open_read("state"); @@ -257,8 +262,8 @@ static unsigned processorstart(struct logdir *ld) execv("/bin/sh", prog); bb_perror_msg_and_die(FATAL"cannot %s processor %s", "run", ld->name); } + ld->fnsave[26] = sv_ch; /* ...restore */ ld->ppid = pid; - return 1; } static unsigned processorstop(struct logdir *ld) |