Manpages - _longjmp.3p

This manual page is part of the POSIX Programmer’s Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

_longjmp, _setjmp — non-local goto

  #include <setjmp.h>
  void _longjmp(jmp_buf env, int val);
  int _setjmp(jmp_buf env);

The /_longjmp/() and /_setjmp/() functions shall be equivalent to /longjmp/() and /setjmp/(), respectively, with the additional restriction that /_longjmp/() and /_setjmp/() shall not manipulate the signal mask.

If _longjmp/() is called even though /env was never initialized by a call to /_setjmp/(), or when the last such call was in a function that has since returned, the results are undefined.

Refer to /longjmp ( )/ and /setjmp ( )/.

No errors are defined.

The following sections are informative.

None.

If /_longjmp/() is executed and the environment in which /_setjmp/() was executed no longer exists, errors can occur. The conditions under which the environment of the /_setjmp/() no longer exists include exiting the function that contains the /_setjmp/() call, and exiting an inner block with temporary storage. This condition might not be detectable, in which case the /_longjmp/() occurs and, if the environment no longer exists, the contents of the temporary storage of an inner block are unpredictable. This condition might also cause unexpected process termination. If the function has returned, the results are undefined.

Passing /longjmp/() a pointer to a buffer not created by /setjmp/(), passing /_longjmp/() a pointer to a buffer not created by /_setjmp/(), passing /siglongjmp/() a pointer to a buffer not created by /sigsetjmp/(), or passing any of these three functions a buffer that has been modified by the user can cause all the problems listed above, and more.

The /_longjmp/() and /_setjmp/() functions are included to support programs written to historical system interfaces. New applications should use /siglongjmp/() and /sigsetjmp/() respectively.

None.

The /_longjmp/() and /_setjmp/() functions may be removed in a future version.

/longjmp ( )/, /setjmp ( )/, /siglongjmp ( )/, /sigsetjmp ( )/

The Base Definitions volume of POSIX.1‐2017, <setjmp.h>

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology – Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

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