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Fix warnings from kill and getpid not being implemented #183

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merged 2 commits into from
Sep 21, 2023
Merged

Fix warnings from kill and getpid not being implemented #183

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4c9d70f
Fix warnings from kill and getpid not being implemented
multiplemonomials Sep 21, 2023
54dd89f
Fix comments
multiplemonomials Sep 21, 2023
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29 changes: 25 additions & 4 deletions platform/source/mbed_retarget.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1464,6 +1464,10 @@ extern "C" WEAK void __cxa_pure_virtual(void)
// SP. This make it compatible with RTX RTOS thread stacks.
#if defined(TOOLCHAIN_GCC_ARM)

// Turn off the errno macro and use actual global variable instead.
#undef errno
extern "C" int errno;

#if defined(MBED_SPLIT_HEAP)

// Default RAM memory used for heap
Expand Down Expand Up @@ -1506,10 +1510,6 @@ extern "C" WEAK caddr_t _sbrk(int incr)
extern "C" uint32_t __end__;
extern "C" uint32_t __HeapLimit;

// Turn off the errno macro and use actual global variable instead.
#undef errno
extern "C" int errno;

// Weak attribute allows user to override, e.g. to use external RAM for dynamic memory.
extern "C" WEAK caddr_t _sbrk(int incr)
{
Expand All @@ -1529,6 +1529,27 @@ extern "C" WEAK caddr_t _sbrk(int incr)
#endif
#endif

#if defined(TOOLCHAIN_GCC_ARM)

// Implementation of getpid for Newlib, following signature here:
// https://github.com/bminor/newlib/blob/55485616ba2afedca05da40f5cde59ee336b9f28/newlib/libc/sys/arm/syscalls.c#L32
extern "C" pid_t _getpid()
{
// Since PIDs aren't a thing on embedded, just return 0
return 0;
}

// Implementation of kill for Newlib, following signature here:
// https://github.com/bminor/newlib/blob/55485616ba2afedca05da40f5cde59ee336b9f28/newlib/libc/sys/arm/syscalls.c#L33
extern "C" int _kill(int pid, int signal)
{
// Always return error
errno = ENOSYS;
return -1;
}

#endif

#if defined(TOOLCHAIN_GCC_ARM)
extern "C" void _exit(int return_code)
{
Expand Down
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