Declaration:
void longjmp(jmp_buf environment,
int value);
Causes the environment to be restored from a setjmp
call where the environment variable had been saved. It causes
execution to goto the setjmp location as if
setjmp had returned the value of the
variable value. The variable value cannot be zero.
However, if zero is passed, then 1 is replaced. If the function
where setjmp was called has terminated, then
the results are undefined.
Example:
#include<setjmp.h>
#include<stdio.h>
void some_function(jmp_buf);
int main(void)
{
int value;
jmp_buf environment_buffer;
value=setjmp(environment_buffer);
if(value!=0)
{
printf("Reached this point from a longjmp with value=%d.\n",value);
exit(0);
}
printf("Calling function.\n");
some_function(environment_buffer);
return 0;
}
void some_function(jmp_buf env_buf)
{
longjmp(env_buf,5);
}
The output from this program should be:
Calling function.
Reached this point from a longjmp with value=5.
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