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system function return value
Hi,
system function returns int type in linux c.
example: int ret;
ret=system("./fxn");
system will get the return value of fxn, but it is obtained by shifting 8 bit to right. (it means, it contains return value in higher byte). then what type of information is in lower byte?
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learner
system function returns int type in linux c.
example: int ret;
ret=system("./fxn");
system will get the return value of fxn, but it is obtained by shifting 8 bit to right. (it means, it contains return value in higher byte). then what type of information is in lower byte?
-----------
learner
Shifting 8 bits to the right is not the documented way to obtain the return value from the return code of system(). Both Linux documentation (
The other bits must be holding the information that can be extracted with the other
man 3 system) and POSIX itself only document WEXITSTATUS(ret). The other bits must be holding the information that can be extracted with the other
W... macros (WIFSIGNALED etc)
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