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added sigchld handler, cleaned error checking.

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This commit is contained in:
Aurélien Aptel
2009-06-11 16:41:14 +02:00
parent 2f35cef54b
commit ad39f000be
2 changed files with 41 additions and 26 deletions
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60
st.c
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@ -1,4 +1,4 @@
/* See LICENSE for licence details. */
/* See LICENSE for licence details. */
#include "st.h"
/* Globals */
@ -7,6 +7,7 @@ XWindow xw;
Term term;
Escseq escseq;
int cmdfd;
pid_t pid;
int running;
void
@ -27,34 +28,45 @@ execsh(void) {
}
void
xbell(void) { /* visual bell */
xbell(void) { /* visual bell */
XRectangle r = { 0, 0, xw.w, xw.h };
XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
usleep(30000);
/* usleep(30000); */
draw(SCredraw);
}
void
sigchld(int a) {
int stat = 0;
if(waitpid(pid, &stat, 0) < 0)
die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
if(WIFEXITED(stat))
exit(WEXITSTATUS(stat));
else
exit(EXIT_FAILURE);
}
void
ttynew(void) {
int m, s;
pid_t pid;
char *pts;
if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
die("openpt");
if(grantpt(m) == -1)
die("grandpt");
if(unlockpt(m) == -1)
die("unlockpt");
if((pts = ptsname(m)) == NULL)
die("ptsname");
die("openpt failed: %s\n", SERRNO);
if(grantpt(m) < 0)
die("grandpt failed: %s\n", SERRNO);
if(unlockpt(m) < 0)
die("unlockpt failed: %s\n", SERRNO);
if(!(pts = ptsname(m)))
die("ptsname failed: %s\n", SERRNO);
if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
die("slave open");
die("Couldn't open slave: %s\n", SERRNO);
fcntl(s, F_SETFL, O_NDELAY);
switch(pid = fork()) {
case -1:
die("fork");
die("fork failed\n");
break;
case 0:
setsid(); /* create a new process group */
@ -62,12 +74,13 @@ ttynew(void) {
dup2(s, STDOUT_FILENO);
dup2(s, STDERR_FILENO);
if(ioctl(s, TIOCSCTTY, NULL) < 0)
die("slave TTIOCSTTY");
die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
execsh();
break;
default:
close(s);
cmdfd = m;
signal(SIGCHLD, sigchld);
}
}
@ -85,9 +98,8 @@ ttyread(void) {
int ret;
switch(ret = read(cmdfd, buf, BUFSIZ)) {
case -1: /* error or exit */
/* XXX: be more precise */
running = 0;
case -1:
die("Couldn't read from shell: %s\n", SERRNO);
break;
default:
tputs(buf, ret);
@ -97,7 +109,7 @@ ttyread(void) {
void
ttywrite(char *s, size_t n) {
if(write(cmdfd, s, n) == -1)
die("write error on tty.");
die("write error on tty: %s\n", SERRNO);
}
void
@ -108,7 +120,7 @@ ttyresize(int x, int y) {
w.ws_col = term.col;
w.ws_xpixel = w.ws_ypixel = 0;
if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
fprintf(stderr, "Couldn't set window size: %m\n");
fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
}
int
@ -889,7 +901,7 @@ run(void) {
running = 1;
XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* seems to fix the resize bug in wmii */
XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
while(running) {
FD_ZERO(&rfd);
@ -898,11 +910,9 @@ run(void) {
XFlush(xw.dis);
ret = select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL);
if(ret < 0) {
fprintf(stderr, "select: %m\n");
running = 0;
}
if(ret < 0)
die("select failed: %s\n", SERRNO);
if(FD_ISSET(xfd, &rfd)) {
while(XPending(xw.dis)) {
XNextEvent(xw.dis, &ev);