7.10 SYS_ERRNO (0x13)

Returns the value of the C library errno variable associated with the host implementation of the semihosting SVCs.

The errno variable can be set by a number of C library semihosted functions, including:

  • SYS_REMOVE

  • SYS_OPEN

  • SYS_CLOSE

  • SYS_READ

  • SYS_WRITE

  • SYS_SEEK.

Whether errno is set or not, and to what value, is entirely host-specific, except where the ISO C standard defines the behavior.

Entry

There are no parameters. Register R1 must be zero.

Return

On exit, R0 contains the value of the C library errno variable.

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