src/usr.bin/less/os.c - diff

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Diff for /src/usr.bin/less/os.c between version 1.6 and 1.7

version 1.6, 2003/04/13 18:26:26

version 1.7, 2003/06/07 03:35:19

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#include "less.h"

#include <signal.h>

#include <setjmp.h>

#if HAVE_TIME_H

#include <time.h>

#endif

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#define time_type long

#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 HAVE__SETJMP && HAVE_SIGSETMASK

#define SET_JUMP _setjmp

#define LONG_JUMP _longjmp

#else

#define SET_JUMP setjmp

#define LONG_JUMP longjmp

#endif

public int reading;

static jmp_buf read_label;

extern int sigs;

* 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)

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}

#endif

if (SET_JUMP(read_label))

{

* We jumped here from intread.

reading = 0;

#if HAVE_SIGPROCMASK

{

sigset_t mask;

sigemptyset(&mask);

sigprocmask(SIG_SETMASK, &mask, NULL);

}

#else

#if HAVE_SIGSETMASK

sigsetmask(0);

#else

#ifdef _OSK

sigmask(~0);

#endif

return (READ_INTR);

}

flush();

reading = 1;

#if MSDOS_COMPILER==DJGPPC

if (isatty(fd))

{

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}

#endif

reading = 0;

if (n < 0)

return (-1);

return (errno == EINTR ? READ_INTR : -1);

return (n);

}

* Interrupt a pending iread().

public void

intread()

{

LONG_JUMP(read_label, 1);

}