ref: 17189bc8295651f0959354596c39551994061a37
dir: /doc/man3/setjmp.3/
.TH SETJMP 3 .SH NAME setjmp - non-local jumps .SH SYNOPSIS #include <setjmp.h> .nf int setjmp(jmp_buf env) void longjmp(jmp_buf env, int val) .fi .SH DESCRIPTION The .BR setjmp () function saves it calling environment in its argument .I env for later use by the .BR longjmp . The .BR longjmp () function restores the environment saved by the most recent invocation of .B setjmp in the same invocation of the program with the corresponding .I env as argument. If there has been no such invocation, or if the function containing the invocation of .B setjmp has terminated execution, or if the invocation of .B setjmp was within the scope of an identifier with variably modified type and execution has left that scope in interim, the behavior is undefined. .SH RETURN VALUE If the return is from a direct invocation, .B setjmp shall return the value zero. If the return is from a call to .BR longjmp , .B setjmp shall return a nonzero value. After the function .B longjmp is called, program execution continues as if the corresponding invocation of .B setjmp has just returned the value specified by .IR val . The function .B longjmp shall not cause the function .B setjmp to return the value 0. If .I val is set to 0, .B setjmp shall return the value 1. .SH STANDARDS .nf ISO/IEC 9899:1999 Section 7.13.1.1 Paragraph 1,2,3 ISO/IEC 9899:1999 Section 7.13.2.1 Paragraph 1,2,3,4 .fi .SH SEE ALSO .BR setjmp.h (3)