|SETJMP(3P)||POSIX Programmer's Manual||SETJMP(3P)|
int setjmp(jmp_buf env);
A call to setjmp() shall save the calling environment in its env argument for later use by longjmp().
It is unspecified whether setjmp() is a macro or a function. If a macro definition is suppressed in order to access an actual function, or a program defines an external identifier with the name setjmp, the behavior is undefined.
An application shall ensure that an invocation of setjmp() appears in one of the following contexts only:
- The entire controlling expression of a selection or iteration statement
- One operand of a relational or equality operator with the other operand an integral constant expression, with the resulting expression being the entire controlling expression of a selection or iteration statement
- The operand of a unary '!' operator with the resulting expression being the entire controlling expression of a selection or iteration
- The entire expression of an expression statement (possibly cast to void)
If the invocation appears in any other context, the behavior is undefined.
The following sections are informative.
The Base Definitions volume of POSIX.1‐2017, <setjmp.h>
Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
|2017||IEEE/The Open Group|