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#define _BSDTIME_EXTENSION
#include "lib.h"
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include "sys9.h"
#include <string.h>
Fdinfo _fdinfo[OPEN_MAX];
/*
called from _envsetup, either with the value of the environment
variable _fdinfo (from s to se-1), or with s==0 if there was no _fdinfo
*/
static void
defaultfdinit(void)
{
int i;
Fdinfo *fi;
for(i = 0; i <= 2; i++) {
fi = &_fdinfo[i];
fi->flags = FD_ISOPEN;
fi->oflags = (i == 0)? O_RDONLY : O_WRONLY;
if(_isatty(i))
fi->flags |= FD_ISTTY;
}
}
static int
readprocfdinit(void)
{
/* construct info from /proc/$pid/fd */
char buf[8192];
Fdinfo *fi;
int fd, pfd, n, tot, m;
char *s, *nexts;
memset(buf, 0, sizeof buf);
strcpy(buf, "/proc/");
_ultoa(buf+6, getpid());
strcat(buf, "/fd");
pfd = _OPEN(buf, OREAD);
if(pfd < 0)
return -1;
memset(buf, 0, sizeof buf);
tot = 0;
for(;;){
n = _PREAD(pfd, buf+tot, sizeof buf-tot, tot);
if(n <= 0)
break;
tot += n;
}
_CLOSE(pfd);
if(n < 0)
return -1;
buf[sizeof buf-1] = '\0';
s = strchr(buf, '\n'); /* skip current directory */
if(s == 0)
return -1;
s++;
m = 0;
for(; s && *s; s=nexts){
nexts = strchr(s, '\n');
if(nexts)
*nexts++ = '\0';
errno = 0;
fd = strtoul(s, &s, 10);
if(errno != 0)
return -1;
if(fd < 0 || fd == pfd || fd >= OPEN_MAX)
continue;
fi = &_fdinfo[fd];
fi->flags = FD_ISOPEN;
while(*s == ' ' || *s == '\t')
s++;
if(*s == 'r'){
m |= 1;
s++;
}
if(*s == 'w'){
m |= 2;
}
if(m==1)
fi->oflags = O_RDONLY;
else if(m==2)
fi->oflags = O_WRONLY;
else
fi->oflags = O_RDWR;
if(strlen(s) >= 9 && strcmp(s+strlen(s)-9, "/dev/cons") == 0)
fi->flags |= FD_ISTTY;
}
return 0;
}
static void
sfdinit(int usedproc, char *s, char *se)
{
Fdinfo *fi;
unsigned long fd, fl, ofl;
char *e;
while(s < se){
fd = strtoul(s, &e, 10);
if(s == e)
break;
s = e;
fl = strtoul(s, &e, 10);
if(s == e)
break;
s = e;
ofl = strtoul(s, &e, 10);
if(s == e)
break;
s = e;
if(fd < OPEN_MAX){
fi = &_fdinfo[fd];
if(usedproc && !(fi->flags&FD_ISOPEN))
continue; /* should probably ignore all of $_fdinit */
fi->flags = fl;
fi->oflags = ofl;
if(_isatty(fd))
fi->flags |= FD_ISTTY;
}
}
}
void
_fdinit(char *s, char *se)
{
int i, usedproc;
Fdinfo *fi;
struct stat sbuf;
usedproc = 0;
if(readprocfdinit() == 0)
usedproc = 1;
if(s)
sfdinit(usedproc, s, se);
if(!s && !usedproc)
defaultfdinit();
for(i = 0; i < OPEN_MAX; i++) {
fi = &_fdinfo[i];
if(fi->flags&FD_ISOPEN){
if(fstat(i, &sbuf) >= 0) {
fi->uid = sbuf.st_uid;
fi->gid = sbuf.st_gid;
}
}
}
}
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