mirror of
https://github.com/GnoConsortium/gno.git
synced 2024-12-21 23:29:16 +00:00
784e3de7cd
passwd, ps, purge, shutdown, stty, upper, and vi. These sources are for the versions of the utils shipped with GNO v2.0.4.
144 lines
2.5 KiB
C
144 lines
2.5 KiB
C
/*
|
|
* Operating system dependent routines.
|
|
*
|
|
* Most of the stuff in here is based on Unix, but an attempt
|
|
* has been made to make things work on other operating systems.
|
|
* This will sometimes result in a loss of functionality, unless
|
|
* someone rewrites code specifically for the new operating system.
|
|
*
|
|
* The makefile provides defines to decide whether various
|
|
* Unix features are present.
|
|
*/
|
|
#pragma noroot
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <signal.h>
|
|
#include <setjmp.h>
|
|
#include "less.h"
|
|
|
|
#ifdef _ORCAC_
|
|
segment "LoadSegONE";
|
|
#include <fcntl.h>
|
|
#endif
|
|
|
|
/*
|
|
* BSD setjmp() saves (and longjmp() restores) the signal mask.
|
|
* This costs a system call or two per setjmp(), so if possible we clear the
|
|
* signal mask with sigsetmask(), and use _setjmp()/_longjmp() instead.
|
|
* On other systems, setjmp() doesn't affect the signal mask and so
|
|
* _setjmp() does not exist; we just use setjmp().
|
|
*/
|
|
#if HAS__SETJMP && SIGSETMASK
|
|
#define SET_JUMP _setjmp
|
|
#define LONG_JUMP _longjmp
|
|
#else
|
|
#define SET_JUMP setjmp
|
|
#define LONG_JUMP longjmp
|
|
#endif
|
|
|
|
extern char *getenv(char *);
|
|
|
|
public int reading;
|
|
|
|
static jmp_buf read_label;
|
|
|
|
/*
|
|
* Like read() system call, but is deliberately interruptible.
|
|
* A call to intread() from a signal handler will interrupt
|
|
* any pending iread().
|
|
*/
|
|
public int iread(fd, buf, len)
|
|
int fd;
|
|
char *buf;
|
|
unsigned int len;
|
|
{
|
|
register int n;
|
|
|
|
if (SET_JUMP(read_label))
|
|
{
|
|
/*
|
|
* We jumped here from intread.
|
|
*/
|
|
reading = 0;
|
|
#if SIGSETMASK
|
|
sigsetmask(0);
|
|
#endif
|
|
return (READ_INTR);
|
|
}
|
|
|
|
flush();
|
|
reading = 1;
|
|
n = read(fd, buf, len);
|
|
reading = 0;
|
|
if (n < 0)
|
|
return (-1);
|
|
return (n);
|
|
}
|
|
|
|
/*
|
|
* Interrupt a pending iread().
|
|
*/
|
|
public void
|
|
intread(void)
|
|
{
|
|
LONG_JUMP(read_label, 1);
|
|
}
|
|
|
|
#if GET_TIME
|
|
public long
|
|
get_time(void)
|
|
{
|
|
long t;
|
|
|
|
time(&t);
|
|
return (t);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* errno_message: Return an error message based on the value of "errno".
|
|
*/
|
|
|
|
#if PERROR
|
|
|
|
extern char *sys_errlist[];
|
|
extern int sys_nerr;
|
|
extern int errno;
|
|
|
|
public char *
|
|
errno_message(filename)
|
|
char *filename;
|
|
{
|
|
register char *p;
|
|
register char *m;
|
|
char msg[16];
|
|
|
|
if (errno < sys_nerr)
|
|
p = sys_errlist[errno];
|
|
else
|
|
{
|
|
sprintf(msg, "Error %d", errno);
|
|
p = msg;
|
|
}
|
|
m = (char *) ecalloc(strlen(filename) + strlen(p) + 3, sizeof(char));
|
|
sprintf(m, "%s: %s", filename, p);
|
|
return (m);
|
|
}
|
|
|
|
#else
|
|
|
|
public char *
|
|
errno_message(filename)
|
|
char *filename;
|
|
{
|
|
register char *m;
|
|
static char msg[] = ": cannot open";
|
|
|
|
m = (char *) ecalloc(strlen(filename) + sizeof(msg), sizeof(char));
|
|
strcpy(m, filename);
|
|
strcat(m, msg);
|
|
return (m);
|
|
}
|
|
|
|
#endif
|