17: Proper Error Handling with exec

pravjot

17: Proper Error Handling with exec

Why is it important to use an if condition to check whether the exec API failed, instead of writing code immediately after the exec call as the failure case? Illustrate your answer with an example.

gaurav133232

execl("/bin/uname","uname",argv[1],(char*)0);

FATAL("execl failed\n");

Here whenever an error occurs, the FATAL condition won't run as no error code or value is specified. Instead, it should be used as:

int ret = execl("/bin/uname","uname",argv[1],(char*)0);

if(ret == -1)

perror("execl failed.\n")

As this would return the specific errno on failure.

17: Proper Error Handling with exec

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