SETMODE(3) Library Functions Manual SETMODE(3) NAME getmode, setmode -- modify mode bits LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <unistd.h> mode_t getmode(const void *set, mode_t mode); void * setmode(const char *mode_str); DESCRIPTION The getmode() function returns a copy of the file permission bits mode as altered by the values pointed to by set. While only the mode bits are al- tered, other parts of the file mode may be examined. The setmode() function takes an absolute (octal) or symbolic value, as de- scribed in chmod(1), as an argument and returns a pointer to mode values to be supplied to getmode(). Because some of the symbolic values are relative to the file creation mask, setmode() may call umask(2). If this occurs, the file creation mask will be restored before setmode() returns. If the calling program changes the value of its file creation mask after calling setmode(), setmode() must be called again if getmode() is to modify future file modes correctly. If the mode passed to setmode() is invalid or if memory cannot be allocated for the return value, setmode() returns NULL. The value returned from setmode() is obtained from malloc() and should be returned to the system with free() when the program is done with it, gener- ally after a call to getmode(). ERRORS The setmode() function may fail and set errno for any of the errors speci- fied for the library routine malloc(3) or strtol(3). In addition, set- mode() will fail and set errno to: [EINVAL] The mode argument does not represent a valid mode. SEE ALSO chmod(1), stat(2), umask(2), malloc(3) HISTORY The getmode() and setmode() functions first appeared in 4.4BSD. BUGS The setmode() function is not thread safe. Files created in other threads while setmode() is being called may be created with a umask of 0. FreeBSD 15.1 July 18, 2019 SETMODE(3)
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