Allow multiple console output
When booting a kernel with multiple serial console support, or multuiple console arguments ala "console=tty1 console=ttyS0,9600" the kernel will output messages to all consoles, init however will not. It will only send output to, and accept input from, the last of the consoles. This patch fixes it. (Author is Martin Buck.)
This commit is contained in:
Jesse Smith
parent
f52d703c8e
commit
986bee63c0
154
src/bootlogd.c
154
src/bootlogd.c
@ -57,6 +57,7 @@
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char *Version = "@(#) bootlogd 2.86 03-Jun-2004 miquels@cistron.nl";
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#define LOGFILE "/var/log/boot"
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#define MAX_CONSOLES 16
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char ringbuf[32768];
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char *endptr = ringbuf + sizeof(ringbuf);
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@ -68,6 +69,11 @@ int didnl = 1;
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int createlogfile = 0;
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int syncalot = 0;
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struct real_cons {
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char name[1024];
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int fd;
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};
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/*
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* Console devices as listed on the kernel command line and
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* the mapping to actual devices in /dev
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@ -230,10 +236,10 @@ int isconsole(char *s, char *res, int rlen)
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}
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/*
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* Find out the _real_ console. Assume that stdin is connected to
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* Find out the _real_ console(s). Assume that stdin is connected to
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* the console device (/dev/console).
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*/
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int consolename(char *res, int rlen)
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int consolenames(struct real_cons *cons, int max_consoles)
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{
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#ifdef TIOCGDEV
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unsigned int kdev;
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@ -242,34 +248,9 @@ int consolename(char *res, int rlen)
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char buf[256];
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char *p;
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int didmount = 0;
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int n, r;
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int n;
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int fd;
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fstat(0, &st);
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if (major(st.st_rdev) != 5 || minor(st.st_rdev) != 1) {
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/*
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* Old kernel, can find real device easily.
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*/
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int r = findtty(res, "/dev", rlen, st.st_rdev);
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if (0 != r)
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fprintf(stderr, "bootlogd: cannot find console device "
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"%d:%d under /dev\n", major(st.st_rdev), minor(st.st_rdev));
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return r;
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}
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#ifdef TIOCGDEV
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# ifndef ENOIOCTLCMD
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# define ENOIOCTLCMD 515
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# endif
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if (ioctl(0, TIOCGDEV, &kdev) == 0) {
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int r = findtty(res, "/dev", rlen, (dev_t)kdev);
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if (0 != r)
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fprintf(stderr, "bootlogd: cannot find console device "
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"%d:%d under /dev\n", major(kdev), minor(kdev));
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return r;
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}
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if (errno != ENOIOCTLCMD) return -1;
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#endif
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int considx, num_consoles = 0;
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#ifdef __linux__
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/*
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@ -278,7 +259,7 @@ int consolename(char *res, int rlen)
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stat("/", &st);
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if (stat("/proc", &st2) < 0) {
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perror("bootlogd: /proc");
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return -1;
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return 0;
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}
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if (st.st_dev == st2.st_dev) {
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if (mount("proc", "/proc", "proc", 0, NULL) < 0) {
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@ -288,21 +269,21 @@ int consolename(char *res, int rlen)
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didmount = 1;
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}
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n = 0;
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r = -1;
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n = -1;
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if ((fd = open("/proc/cmdline", O_RDONLY)) < 0) {
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perror("bootlogd: /proc/cmdline");
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} else {
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buf[0] = 0;
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if ((n = read(fd, buf, sizeof(buf) - 1)) >= 0)
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r = 0;
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else
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if ((n = read(fd, buf, sizeof(buf) - 1)) < 0)
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perror("bootlogd: /proc/cmdline");
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close(fd);
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}
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if (didmount) umount("/proc");
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if (r < 0) return r;
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if (n < 0) return 0;
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/*
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* OK, so find console= in /proc/cmdline.
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@ -310,21 +291,32 @@ int consolename(char *res, int rlen)
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*/
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p = buf + n;
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*p-- = 0;
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r = -1;
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while (p >= buf) {
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if (*p == ' ' || *p == '\t' || *p == '\r' || *p == '\n') {
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*p-- = 0;
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continue;
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}
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if (strncmp(p, "console=", 8) == 0 &&
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isconsole(p + 8, res, rlen)) {
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r = 0;
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break;
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isconsole(p + 8, cons[num_consoles].name, sizeof(cons[num_consoles].name))) {
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/*
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* Suppress duplicates
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*/
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for (considx = 0; considx < num_consoles; considx++) {
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if (!strcmp(cons[num_consoles].name, cons[considx].name)) {
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goto dontuse;
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}
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}
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num_consoles++;
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if (num_consoles >= max_consoles) {
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break;
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}
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}
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dontuse:
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p--;
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}
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if (r == 0) return r;
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if (num_consoles > 0) return num_consoles;
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#endif
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/*
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@ -332,12 +324,12 @@ int consolename(char *res, int rlen)
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* guess the default console.
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*/
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for (n = 0; defcons[n]; n++)
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if (isconsole(defcons[n], res, rlen))
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return 0;
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if (isconsole(defcons[n], cons[0].name, sizeof(cons[0].name)))
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return 1;
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fprintf(stderr, "bootlogd: cannot deduce real console device\n");
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return -1;
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return 0;
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}
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@ -479,7 +471,6 @@ int main(int argc, char **argv)
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struct timeval tv;
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fd_set fds;
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char buf[1024];
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char realcons[1024];
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char *p;
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char *logfile;
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char *pidfile;
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@ -492,6 +483,9 @@ int main(int argc, char **argv)
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#ifndef __linux__ /* BSD-style ioctl needs an argument. */
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int on = 1;
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#endif
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int considx;
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struct real_cons cons[MAX_CONSOLES];
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int num_consoles, consoles_left;
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fp = NULL;
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logfile = LOGFILE;
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@ -538,6 +532,7 @@ int main(int argc, char **argv)
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/*
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* Open console device directly.
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*/
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/*
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if (consolename(realcons, sizeof(realcons)) < 0)
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return 1;
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@ -550,6 +545,25 @@ int main(int argc, char **argv)
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fprintf(stderr, "bootlogd: %s: %s\n", realcons, strerror(errno));
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return 1;
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}
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*/
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if ((num_consoles = consolenames(cons, MAX_CONSOLES)) <= 0)
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return 1;
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consoles_left = num_consoles;
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for (considx = 0; considx < num_consoles; considx++) {
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if (strcmp(cons[considx].name, "/dev/tty0") == 0)
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strcpy(cons[considx].name, "/dev/tty1");
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if (strcmp(cons[considx].name, "/dev/vc/0") == 0)
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strcpy(cons[considx].name, "/dev/vc/1");
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if ((cons[considx].fd = open_nb(cons[considx].name)) < 0) {
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fprintf(stderr, "bootlogd: %s: %s\n",
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cons[considx].name, strerror(errno));
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consoles_left--;
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}
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}
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if (!consoles_left)
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return 1;
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/*
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* Grab a pty, and redirect console messages to it.
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@ -633,26 +647,34 @@ int main(int argc, char **argv)
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if ((n = read(ptm, inptr, endptr - inptr)) >= 0) {
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/*
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* Write data (in chunks if needed)
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* to the real output device.
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* to the real output devices.
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*/
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m = n;
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p = inptr;
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while (m > 0) {
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i = write(realfd, p, m);
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if (i >= 0) {
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m -= i;
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p += i;
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continue;
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}
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/*
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* Handle EIO (somebody hung
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* up our filedescriptor)
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*/
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realfd = write_err(pts, realfd,
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realcons, errno);
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if (realfd >= 0) continue;
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got_signal = 1; /* Not really */
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break;
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for (considx = 0; considx < num_consoles; considx++) {
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if (cons[considx].fd < 0) continue;
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m = n;
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p = inptr;
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while (m > 0) {
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i = write(cons[considx].fd, p, m);
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if (i >= 0) {
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m -= i;
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p += i;
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continue;
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}
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/*
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* Handle EIO (somebody hung
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* up our filedescriptor)
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*/
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cons[considx].fd = write_err(pts,
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cons[considx].fd,
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cons[considx].name, errno);
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if (cons[considx].fd >= 0) continue;
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/*
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* If this was the last console,
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* generate a fake signal
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*/
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if (--consoles_left <= 0) got_signal = 1;
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break;
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}
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}
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/*
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@ -698,7 +720,9 @@ int main(int argc, char **argv)
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close(pts);
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close(ptm);
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close(realfd);
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for (considx = 0; considx < num_consoles; considx++) {
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close(cons[considx].fd);
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}
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return 0;
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}
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