On my Ubuntu machine, I can see the output at /var/log/syslog. On a RHEL/CentOS machine, the output is found in /var/log/messages. This is controlled by the rsyslog service, so if this is disabled for some reason you may need to start it with systemctl start rsyslog. As noted by others, your syslog() output would be logged by the /var/log/syslog file.You can see system, user, … Read more
Look at the first error message of the compiler. It should complain about the *char in line 6, which should be char *. By the way: always copy and paste error messages, so that we get the original messages.
The static keyword in C has several effects, depending on the context it’s applied to. when applied to a variable declared inside a function, the value of that variable will be preserved between function calls. when applied to a variable declared outside a function, or to a function, the visibility of that variable or function is limited … Read more
Backspace and tab both move the cursor position. Neither is truly a ‘printable’ character. Your code says: print “foo” move the cursor back one space move the cursor forward to the next tabstop output “bar”. To get the output you expect, you need printf(“foo\b \tbar”). Note the extra ‘space’. That says: output “foo” move the cursor … Read more
It will make no difference which one you chose if you’re using a modern compiler[1]. Take for example the following C code. When compiled with gcc -O1 (optimizations enabled), we get the following (identical) machine code in both foo and bar: Both foo and bar end up calling putchar(‘\n’). In other words, modern C compilers are smart enough to optimize printf calls very efficiently. Just use whichever … Read more
I don’t know what type of setup you have, but the following scenario, could I think produce such an effect (or else one similar to it). I have not tested this to verify, so please take it with a grain of salt. If the file/device you are opening implemented as a server application (eg NFS), … Read more
It depends on the implementation, which is free to assume your parameters are valid (i.e. not null in this case). The behaviour may or may not be reproducible from execution to execution, or from one implementation/platform to another.
You can specify a width on string fields, e.g. And then whatever’s printed with that field will be blank-padded to the width you indicate. The – left-justifies your text in that field.
You can install gcc by running setup-x86.exe or setup-x86_64.exe again. The gcc package is in the Devel category: