new -lutil, only openpty() for now

This commit is contained in:
Ben Gras 2005-07-19 16:01:37 +00:00
parent d740cce24d
commit 0f48b1885d
3 changed files with 111 additions and 0 deletions

View file

@ -33,6 +33,7 @@ all:
cd socket && $(MAKE)
cd syscall && $(MAKE)
cd syslib && $(MAKE)
cd util && $(MAKE)
cd sysutil && $(MAKE)
cd timers && $(MAKE)
cd $(ZLIB) && $(MAKE)
@ -59,6 +60,7 @@ install_i86: \
$(LIB)/end.a \
$(LIB)/libsys.a \
$(LIB)/libtimers.a \
$(LIB)/util.a \
$(LIB)/sysutil.a \
$(LIB)/libcurses.a \
$(LIB)/libedit.a \
@ -106,6 +108,9 @@ $(LIB)/libtimers.a: libtimers.a
$(LIB)/libsysutil.a: libsysutil.a
install -c -o bin $? $@
$(LIB)/libutil.a: libutil.a
install -c -o bin $? $@
$(LIB)/libcurses.a: libcurses.a
install -c -o bin $? $@
@ -134,6 +139,7 @@ install_i386: \
$(LIB386)/end.a \
$(LIB386)/libsys.a \
$(LIB386)/libtimers.a \
$(LIB386)/libutil.a \
$(LIB386)/libsysutil.a \
$(LIB386)/libcurses.a \
$(LIB386)/libedit.a \
@ -184,6 +190,9 @@ $(LIB386)/libtimers.a: libtimers.a
$(LIB386)/libsysutil.a: libsysutil.a
install -c -o bin $? $@
$(LIB386)/libutil.a: libutil.a
install -c -o bin $? $@
$(LIB386)/libcurses.a: libcurses.a
install -c -o bin $? $@

19
lib/util/Makefile Normal file
View file

@ -0,0 +1,19 @@
# Makefile for lib/util.
CFLAGS = -O -D_MINIX -D_POSIX_SOURCE
CC1 = $(CC) $(CFLAGS) -c
LIBUTIL = ../libutil.a
all: $(LIBUTIL)
OBJECTS = \
$(LIBUTIL)(openpty.o)
$(LIBUTIL): $(OBJECTS)
aal cr $@ *.o
rm *.o
$(LIBUTIL)(openpty.o): openpty.c
$(CC1) openpty.c

83
lib/util/openpty.c Normal file
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@ -0,0 +1,83 @@
/*
* openpty() tries to open a pty; applications won't have to
* duplicate this code all the time (or change it if the system
* pty interface changes).
*
* First version by Ben Gras <beng@few.vu.nl>,
* Initially heavily based on telnetd/pty.c
* by Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>.
*
*/
#include <libutil.h>
#include <termios.h>
#include <fcntl.h>
#include <grp.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioc_tty.h>
#define DEV_DIR "/dev"
/*
* Allocate a PTY, by trying to open one repeatedly.
*/
int openpty(int *amaster, int *aslave, char *name,
struct termios *termp, struct winsize *winp)
{
char buff[128], temp[128];
register int i, j;
int pty_fd = -1, gr;
static char tty_name[128];
struct group *ttygroup;
gid_t tty_gid = 0;
if(!amaster || !aslave) {
errno = EINVAL;
return -1;
}
for(i = 'p'; i < 'w'; i++) {
j = 0;
do {
sprintf(buff, "%s/pty%c%c",
DEV_DIR, i, (j < 10) ? j + '0' : j + 'a' - 10);
if((*amaster = open(buff, O_RDWR)) >= 0) {
sprintf(tty_name, "%s/tty%c%c", DEV_DIR,
i, (j < 10) ? j + '0' : j + 'a' - 10);
if((*aslave = open(tty_name, O_RDWR)) >= 0) {
break;
}
close(*amaster);
}
j++;
if (j == 16) break;
} while(1);
/* Did we find one? */
if (j < 16) break;
}
if (*amaster < 0) { errno = ENOENT; return(-1); }
setgrent();
ttygroup = getgrnam("tty");
endgrent();
if(ttygroup) tty_gid = ttygroup->gr_gid;
if(name) strcpy(name, tty_name);
/* Ignore errors on these. */
chown(tty_name, getuid(), tty_gid);
chmod(tty_name, 0620); /* -rw--w---- */
if(termp) tcsetattr(*aslave, TCSAFLUSH, termp);
if(winp) ioctl(*aslave, TIOCSWINSZ, winp);
return(0);
}