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I am using a dev system where I have to specify the lib name when accessing a function inside it.
I've used functions like open() before, and somehow found out that they're in libc.so.
Now I want to use lstat(), but it appears that this one is not in libc. Sadly, the man pages I looked at do not document the location of the functions.
So, two questions:
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By default, libraries are located in /usr/local/lib, /usr/local/lib64, /usr/lib and /usr/lib64; system startup libraries are in /lib and /lib64. Programmers can, however, install libraries in custom locations. The library path can be defined in /etc/ld.
A system call is a function provided by the kernel to enter into the kernel mode to access the hardware resources. A Library call is a function provided by the programming library to perform a task. 6. System call are the entry points of the kernel, and therefore they are not linked to the program.
System Library − System libraries are special functions or programs using which application programs or system utilities accesses Kernel's features. These libraries implement most of the functionalities of the operating system and do not requires kernel module's code access rights.
In terms of commands, we may use the ldd command to find out missing dependencies. Also, we can use the ldconfig command with the -p option to check if a shared library is installed. Finally, we should check the standard library paths like /usr/lib and /usr/local/lib as well as extra paths listed in the /etc/ld.
Build a simple testcase in C, compile it and run 'ldd -r' on it to check what libs are loaded. If you don't get lstat() in C then you have a problem on your dev env. Or this env dates back before the age of symlinks :-)
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