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.TH mkdir 2 "16 Sep 2020" "Oracle Solaris 11.4" "System Calls"
.SH NAME
mkdir, mkdirat \- make a directory relative to directory file descriptor
.SH SYNOPSIS

.LP
.nf
#include <sys/stat.h>

\fBint\fR \fBmkdir\fR(\fBconst char *\fR\fIpath\fR, \fBmode_t\fR \fImode\fR);
.fi

.LP
.nf
\fBint\fR \fBmkdirat\fR(\fBint\fR \fIfd\fR, \fBconst char *\fR\fIpath\fR, \fBmode_t\fR \fImode\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fBmkdir()\fR function creates a new directory named by the path name pointed to by \fIpath\fR. The mode of the new directory is initialized from \fImode\fR (see \fBchmod\fR(2) for values of mode). The access permission bits (\fBS_IAMB\fR) of the \fImode\fR argument is modified by the process's file creation mask (see \fBumask\fR(2)).
.sp
.LP
The directory's owner \fBID\fR is set to the process's effective user ID. The directory's group \fBID\fR is set to the process's effective group ID, or if the \fBS_ISGID\fR bit is set in the parent directory, then the group \fBID\fR of the directory is inherited from the parent. The \fBS_ISGID\fR bit of the new directory is inherited from the parent directory.
.sp
.LP
If \fIpath\fR names a symbolic link, \fBmkdir()\fR fails and sets errno to \fBEEXIST\fR.
.sp
.LP
The newly created directory is empty with the exception of entries for itself (\fB.\fR) and its parent directory (\fB..\fR).
.sp
.LP
Upon successful completion, \fBmkdir()\fR marks for update the \fBst_atime\fR, \fBst_ctime\fR and \fBst_mtime\fR fields of the directory. Also, the \fBst_ctime\fR and \fBst_mtime\fR fields of the directory that contains the new entry are marked for update.
.sp
.LP
The \fBmkdirat()\fR function is equivalent to the \fBmkdir()\fR function except in the case where \fIpath\fR specifies a relative path. In this case the newly created directory is created relative to the directory associated with the file descriptor \fIfd\fR instead of the current working directory. If the file descriptor was opened without \fBO_SEARCH\fR, the function checks whether directory searches are permitted using the current permissions of the directory underlying the file descriptor. If the file descriptor was opened with \fBO_SEARCH\fR, the function does not perform the check.
.sp
.LP
If \fBmkdirat()\fR is passed the special value \fBAT_FDCWD\fR in the \fIfd\fR parameter, the current working directory is used and the behavior is identical to a call to \fBmkdir()\fR.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is returned, no directory is created, and \fBerrno\fR is set to indicate the error.
.SH ERRORS
.sp
.LP
The \fBmkdir()\fR and \fBmkdirat()\fR functions will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEACCES\fR\fR
.ad
.RS 16n
.rt
Either a component of the path prefix denies search permission or write permission is denied on the parent directory of the directory to be created.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEDQUOT\fR\fR
.ad
.RS 16n
.rt
The directory where the new file entry is being placed cannot be extended because the user's quota of disk blocks on that file system has been exhausted; the new directory cannot be created because the user's quota of disk blocks on that file system has been exhausted; or the user's quota of inodes on the file system where the file is being created has been exhausted.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEEXIST\fR\fR
.ad
.RS 16n
.rt
The named file already exists.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEFAULT\fR\fR
.ad
.RS 16n
.rt
The \fIpath\fR argument points to an illegal address.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 16n
.rt
An attempt was made to create an extended attribute that is a directory.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEIO\fR\fR
.ad
.RS 16n
.rt
An I/O error has occurred while accessing the file system.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEILSEQ\fR\fR
.ad
.RS 16n
.rt
The path argument includes non-UTF8 characters and the file system accepts only file names where all characters are part of the UTF-8 character codeset.
.RE

.sp
.ne 2
.mk
.na
\fB\fBELOOP\fR\fR
.ad
.RS 16n
.rt
Too many symbolic links were encountered in translating \fIpath\fR, or a loop exists in symbolic links encountered during resolution of \fIpath\fR
.RE

.sp
.ne 2
.mk
.na
\fB\fBEMLINK\fR\fR
.ad
.RS 16n
.rt
The maximum number of links to the parent directory would be exceeded.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENAMETOOLONG\fR\fR
.ad
.RS 16n
.rt
The length of the \fIpath\fR argument exceeds \fBPATH_MAX\fR, or the length of a \fIpath\fR component exceeds \fBNAME_MAX\fR while \fB_POSIX_NO_TRUNC\fR is in effect.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENOENT\fR\fR
.ad
.RS 16n
.rt
A component of the path prefix does not exist or is a null pathname.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENOLINK\fR\fR
.ad
.RS 16n
.rt
The \fIpath\fR argument points to a remote machine and the link to that machine is no longer active.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENOSPC\fR\fR
.ad
.RS 16n
.rt
No free space is available on the device containing the directory.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENOTDIR\fR\fR
.ad
.RS 16n
.rt
A component of the path prefix is not a directory.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEROFS\fR\fR
.ad
.RS 16n
.rt
The path prefix resides on a read-only file system.
.RE

.sp
.LP
The \fBmkdirat()\fR function will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEBADF\fR\fR
.ad
.RS 9n
.rt
The \fIpath\fR argument does not specify an absolute path and the \fIfd\fR argument is neither \fBAT_FDCWD\fR nor a valid file descriptor open for reading.
.RE

.sp
.LP
The \fBmkdir()\fR and \fBmkdirat()\fR functions may fail if:
.sp
.ne 2
.mk
.na
\fB\fBELOOP\fR\fR
.ad
.RS 16n
.rt
More than {\fBSYMLOOP_MAX\fR} symbolic links were encountered during resolution of the \fIpath\fR argument.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENAMETOOLONG\fR\fR
.ad
.RS 16n
.rt
As a result of encountering a symbolic link in resolution of the \fIpath\fR argument, the length of the substituted pathname string exceeded {\fBPATH_MAX\fR}.
.RE

.sp
.LP
The \fBmkdirat()\fR function may fail if:
.sp
.ne 2
.mk
.na
\fB\fBENOTDIR\fR\fR
.ad
.RS 11n
.rt
The \fIpath\fR argument is not an absolute path and \fIfd\fR is neither \fBAT_FDCWD\fR nor a file descriptor associated with a directory.
.RE

.SH EXAMPLES
.LP
\fBExample 1\fR Create a directory.

.sp
.LP
The following example demonstrates how to create a directory named \fB/home/cnd/mod1\fR, with read, write, and search permissions for owner and group, and with read and search permissions for others.

.sp
.in +2
.nf
#include <sys/stat.h>
int status;
\&...
status = mkdir("/home/cnd/mod1",
     S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
.fi
.in -2
.sp
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp
.TS
tab(
) box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPE
ATTRIBUTE VALUE
_
Interface Stability
Committed
_
MT-Level
Async-Signal-Safe
_
Standard
See \fBstandards\fR(7).
.TE
.sp
.SH SEE ALSO
.sp
.LP
\fBchmod\fR(2), \fBmknod\fR(2), \fBumask\fR(2), \fBmkdirp\fR(3GEN), \fBstat.h\fR(3HEAD), \fBattributes\fR(7), \fBstandards\fR(7)
.SH HISTORY
.sp
.LP
The \fBmkdir()\fR function has been included in all Sun and Oracle releases of Solaris.
.sp
.LP
The \fBmkdirat()\fR function was added to Solaris in the Solaris 11.0 release.