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I am using a custom user space environment that has barely no OS support: only one char device, mass storage interface and a single network socket.
To provide C programming to this platform, I need a libc. Is there any libc project that is configurable enough so that I can map low-level IO to the small API I have access to ?
AFAIK glibc and uclibc are expecting linux syscalls, so I can't use them (without trying to emulate linux syscalls, which is something I prefer to avoid).
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Libc is user-space library, and you can't use it from kernel-space. But almost all functions from libc that make sense in kernel space are ported.
libc is a generic term used to refer to all C standard libraries -- there are several. glibc is the most commonly used one; others include eglibc, uclibc, and dietlibc.
Libc will invoke the OSes drivers which invoke the virtual hardware in your emulator. For a popular example, see DosBox. The other interpretation of your question is that you don't want to write a full emulator, but a binary compatibility layer that allows you to execute mips32 binaries on a non-mips32 system.
Released under the GNU Lesser General Public License, glibc is free software. The GNU C Library project provides the core libraries for the GNU system, as well as many systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX. 1-2008, BSD, OS-specific APIs and more.
There are several different libc's to choose from, but all will need some work to integrate into your system.
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