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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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54
st.c
View file

@ -7,6 +7,7 @@ XWindow xw;
Term term; Term term;
Escseq escseq; Escseq escseq;
int cmdfd; int cmdfd;
pid_t pid;
int running; int running;
void void
@ -31,30 +32,41 @@ xbell(void) { /* visual bell */
XRectangle r = { 0, 0, xw.w, xw.h }; XRectangle r = { 0, 0, xw.w, xw.h };
XSetForeground(xw.dis, dc.gc, dc.col[BellCol]); XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1); XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
usleep(30000); /* usleep(30000); */
draw(SCredraw); 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 void
ttynew(void) { ttynew(void) {
int m, s; int m, s;
pid_t pid;
char *pts; char *pts;
if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0) if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
die("openpt"); die("openpt failed: %s\n", SERRNO);
if(grantpt(m) == -1) if(grantpt(m) < 0)
die("grandpt"); die("grandpt failed: %s\n", SERRNO);
if(unlockpt(m) == -1) if(unlockpt(m) < 0)
die("unlockpt"); die("unlockpt failed: %s\n", SERRNO);
if((pts = ptsname(m)) == NULL) if(!(pts = ptsname(m)))
die("ptsname"); die("ptsname failed: %s\n", SERRNO);
if((s = open(pts, O_RDWR | O_NOCTTY)) < 0) 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); fcntl(s, F_SETFL, O_NDELAY);
switch(pid = fork()) { switch(pid = fork()) {
case -1: case -1:
die("fork"); die("fork failed\n");
break; break;
case 0: case 0:
setsid(); /* create a new process group */ setsid(); /* create a new process group */
@ -62,12 +74,13 @@ ttynew(void) {
dup2(s, STDOUT_FILENO); dup2(s, STDOUT_FILENO);
dup2(s, STDERR_FILENO); dup2(s, STDERR_FILENO);
if(ioctl(s, TIOCSCTTY, NULL) < 0) if(ioctl(s, TIOCSCTTY, NULL) < 0)
die("slave TTIOCSTTY"); die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
execsh(); execsh();
break; break;
default: default:
close(s); close(s);
cmdfd = m; cmdfd = m;
signal(SIGCHLD, sigchld);
} }
} }
@ -85,9 +98,8 @@ ttyread(void) {
int ret; int ret;
switch(ret = read(cmdfd, buf, BUFSIZ)) { switch(ret = read(cmdfd, buf, BUFSIZ)) {
case -1: /* error or exit */ case -1:
/* XXX: be more precise */ die("Couldn't read from shell: %s\n", SERRNO);
running = 0;
break; break;
default: default:
tputs(buf, ret); tputs(buf, ret);
@ -97,7 +109,7 @@ ttyread(void) {
void void
ttywrite(char *s, size_t n) { ttywrite(char *s, size_t n) {
if(write(cmdfd, s, n) == -1) if(write(cmdfd, s, n) == -1)
die("write error on tty."); die("write error on tty: %s\n", SERRNO);
} }
void void
@ -108,7 +120,7 @@ ttyresize(int x, int y) {
w.ws_col = term.col; w.ws_col = term.col;
w.ws_xpixel = w.ws_ypixel = 0; w.ws_xpixel = w.ws_ypixel = 0;
if(ioctl(cmdfd, TIOCSWINSZ, &w) < 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 int
@ -889,7 +901,7 @@ run(void) {
running = 1; running = 1;
XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask); 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) { while(running) {
FD_ZERO(&rfd); FD_ZERO(&rfd);
@ -898,10 +910,8 @@ run(void) {
XFlush(xw.dis); XFlush(xw.dis);
ret = select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL); ret = select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL);
if(ret < 0) { if(ret < 0)
fprintf(stderr, "select: %m\n"); die("select failed: %s\n", SERRNO);
running = 0;
}
if(FD_ISSET(xfd, &rfd)) { if(FD_ISSET(xfd, &rfd)) {
while(XPending(xw.dis)) { while(XPending(xw.dis)) {

7
st.h
View file

@ -1,16 +1,19 @@
/* See LICENSE for licence details. */ /* See LICENSE for licence details. */
#define _XOPEN_SOURCE #define _XOPEN_SOURCE
#include <ctype.h> #include <ctype.h>
#include <errno.h>
#include <fcntl.h> #include <fcntl.h>
#include <locale.h> #include <locale.h>
#include <stdarg.h> #include <stdarg.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <signal.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include <sys/select.h> #include <sys/select.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/types.h> #include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h> #include <unistd.h>
#include <X11/Xlib.h> #include <X11/Xlib.h>
#include <X11/keysym.h> #include <X11/keysym.h>
@ -52,6 +55,7 @@ static char* colorname[] = {
#define ESCSIZ 256 #define ESCSIZ 256
#define ESCARG 16 #define ESCARG 16
#define SERRNO strerror(errno)
#define MIN(a, b) ((a) < (b) ? (a) : (b)) #define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) < (b) ? (b) : (a)) #define MAX(a, b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a) / sizeof(a[0])) #define LEN(a) (sizeof(a) / sizeof(a[0]))
@ -63,7 +67,7 @@ static char* colorname[] = {
enum { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4 }; /* Attribute */ enum { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4 }; /* Attribute */
enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSwrap, CSsave, CSload }; /* Cursor */ enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSwrap, CSsave, CSload }; /* Cursor */
enum { CRset=1 , CRupdate=2 }; /* Character state */ enum { CRset=1 , CRupdate=2 }; /* Character state */
enum { TMwrap=1 , TMinsert=2 }; /* Terminal mode */ enum { TMwrap=1 , TMinsert=2, TMaltcharset }; /* Terminal mode */
enum { SCupdate, SCredraw }; /* screen draw mode */ enum { SCupdate, SCredraw }; /* screen draw mode */
typedef int Color; typedef int Color;
@ -130,6 +134,7 @@ typedef struct {
void die(const char *errstr, ...); void die(const char *errstr, ...);
void draw(int); void draw(int);
void execsh(void); void execsh(void);
void sigchld(int);
void kpress(XKeyEvent *); void kpress(XKeyEvent *);
void resize(XEvent *); void resize(XEvent *);
void run(void); void run(void);