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In case a system call function fails, we normally use perror to output the error message. I want to use fprintf to output the perror string. How can I do something like this:
fprintf(stderr, perror output string here);
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The perror() function prints an error message to stderr . If string is not NULL and does not point to a null character, the string pointed to by string is printed to the standard error stream, followed by a colon and a space.
perror() always does. There is no requirement that writing to either stdout or stderr writes to a terminal screen - that is up to the implementation (since not all systems even have a terminal).
It is good practice to redirect all error messages to stderr , while directing regular output to stdout . It is beneficial to do this because anything written to stderr is not buffered, i.e., it is immediately written to the screen so that the user can be warned immediately.
#include <errno.h>
fprintf(stderr, "%s\n", strerror(errno));
Note: strerror doesn't apply \n to the end of the message
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