getcwd, getwd - get working directory pathname
getcwd(char *buf, size_t size);
The getcwd() function copies the absolute pathname of the
directory into the memory referenced by buf and returns a
pointer to buf.
The size argument is the size, in bytes, of the array referenced by buf.
If buf is NULL, space is allocated as necessary to store the
This space may later be free(3)'d.
The function getwd() is a compatibility routine which calls
its buf argument and a size of MAXPATHLEN (as defined in the
<sys/param.h>). Obviously, buf should be at least MAXPATHLEN bytes in
These routines have traditionally been used by programs to
save the name
of a working directory for the purpose of returning to it.
A much faster
and less error-prone method of accomplishing this is to open
directory (.) and use the fchdir(2) function to return.
Upon successful completion, a pointer to the pathname is returned. Otherwise
a null pointer is returned and the global variable
errno is set to
indicate the error. In addition, getwd() copies the error
with errno into the memory referenced by buf.
The getwd() function will fail if:
[EACCES] Read or search permission was denied for a
component of the
[EINVAL] The size argument is zero.
[ENOENT] A component of the pathname no longer exists.
[ENOMEM] Insufficient memory is available.
[ERANGE] The size argument is greater than zero but
smaller than the
length of the pathname plus 1.
chdir(2), fchdir(2), malloc(3), strerror(3)
The getcwd() function conforms to ANSI X3.159-1989 (``ANSI
ability to specify a null pointer and have getcwd() allocate
necessary is an extension.
The getwd() function appeared in 4.0BSD.
The getwd() function does not do sufficient error checking
and is not
able to return very long, but valid, paths. It is provided
OpenBSD 3.6 December 11, 1993
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