Understanding the Limitations of Errno in Linux and POSIX
By
ingve
Fresh out the oven, still warm. Top of the tray.
Summary
The article discusses the limitations of errno in Linux and POSIX, highlighting that the value in errno is only significant when an error occurs and is never set to zero by system calls or library functions.
Key quotes
· 2 pulledThe value in errno is significant only when the return value of the call indicated an error (i.e., -1 from most system calls; -1 or NULL from most library functions); a function that succeeds is allowed to change errno.
The value of errno is never set to zero by any system call or library function.
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