mkfifo(1) [osf1 man page]
mkfifo(1) General Commands Manual mkfifo(1) NAME
mkfifo - Makes FIFO special files SYNOPSIS
mkfifo [-m mode] file... The mkfifo utility creates FIFO special files in the order specified. STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: mkfifo: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
Sets the file permission bits of the new file to the specified mode value, after creating the FIFO special file. The mode argument is a symbolic mode string (see chmod), in which the operator characters + (plus sign) and - (minus) are interpreted relative to the default file mode for that file type. The + character adds permissions to the default mode, and - deletes permissions from the default mode. [Tru64 UNIX] The default mode is a=rw (permissions of rw-rw-rw) as modified by the current file mode creation mask (umask). OPERANDS
The path name of a FIFO special file to be created. DESCRIPTION
For each file argument, mkfifo performs actions equivalent to the mkfifo() call with the following arguments: The file argument is used as the pathname argument. If the -m option is not used, the value of the bitwise inclusive OR of S_IRUSR, S_IWUSR, S_IRGRP, S_IWGRP, S_IROTH, and S_IWOTH is used as the mode argument. EXIT STATUS
The mkfifo utility exits with one of the following values: Indicates that all the specified FIFO special files were created successfully. Indicates that an error occurred. EXAMPLES
To create a FIFO special file with permissions prw-r--r--, enter: mkfifo -m 644 /tmp/myfifo The command creates the /tmp/myfifo file with read/write permissions for the owner and read permission for the group and for others. To create a FIFO special file using the - (minus) operand to set permissions of prw-r-----, enter: mkfifo -m g-w,o-rw /tmp/fifo2 The command creates the /tmp/fifo2 file, removing write permission for the group and all permissions for others. ENVIRONMENT VARIABLES
The following environment variables affect the execution of mkfifo: Provides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization variables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multibyte characters in arguments). Determines the locale for the format and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of LC_MESSAGES. SEE ALSO
Commands: mkdir(1), mknod(8) Functions: chmod(2), mkdir(2), mkfifo(3), mknod(2), umask(2) Standards: standards(5) mkfifo(1)
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mkfifo(3) Library Functions Manual mkfifo(3) NAME
mkfifo - Creates a FIFO LIBRARY
Standard C Library (libc.a) System V Compatibility Library (libsys5.a) SYNOPSIS
#include <sys/types.h> #include <sys/stat.h> int mkfifo ( const char *path, mode_t mode ); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: mkfifo(): POSIX.1, XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Names the new file. If the final component of the path parameter names a symbolic link, the link will be traversed and pathname resolution will continue. Specifies the type, attributes, and access permissions of the file. This parameter is constructed by logically ORing val- ues described in the sys/mode.h header file. The mode is then modified by the current file mode creation mask (umask) value. DESCRIPTION
The mkfifo function used with libc.a is an interface to the mknod function, where the file that is to be created is a FIFO special file. When used with libsys5.a, the mkfifo() function creates a uni-directional STREAMS based file descriptor. No special system privileges are required under either implementation. Upon successful completion, the mkfifo() function marks the st_atime, st_ctime, and st_mtime fields of the file for update, and sets the st_ctime and st_mtime fields of the directory that contains the new entry for update. RETURN VALUES
Upon successful completion of mkfifo(), a value of 0 (zero) is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
If the mkfifo() function fails, the new file is not created and errno may be set to one of the following values: A component of the path prefix denies search permission, or write permission is denied on the parent directory of the FIFO to be created. The directory in which the entry for the new link is being placed cannot be extended because the user's quota of disk blocks or inodes on the file system is exhausted. The named file exists. Too many links were encountered in translating path. No more file descriptors are available for this process. The system file table is full, or the device containing the pipes has no free inodes. The length of the path parameter exceeds PATH_MAX or a pathname component is longer than NAME_MAX. A component of the path prefix does not exist or the path parameter points to an empty string. The directory that would contain the new file cannot be extended or the file system is out of file allocation resources. A component of the path prefix is not a directory. The mode parameter specifies a file type other than S_IFIFO and the calling process does not have the DEV_CONFIG system privilege. The directory in which the file is to be created is located on a read-only file system. RELATED INFORMATION
Commands: chmod(1), mkdir(1), mkfifo(1) Functions: chmod(2), mkdir(2), mknod(2), open(2), stat(2), umask(2) Standards: standards(5) delim off mkfifo(3)