mkfifo(1m) [sunos man page]
mkfifo(1M) System Administration Commands mkfifo(1M) NAME
mkfifo - make FIFO special file SYNOPSIS
/usr/bin/mkfifo [-m mode] path... DESCRIPTION
The mkfifo utility creates the FIFO special files named by its argument list. The arguments are taken sequentially, in the order specified; and each FIFO special file is either created completely or, in the case of an error or signal, not created at all. If errors are encountered in creating one of the special files, mkfifo writes a diagnostic message to the standard error and continues with the remaining arguments, if any. The mkfifo utility calls the library routine mkfifo(3C), with the path argument is passed as the path argument from the command line, and mode is set to the equivalent of a=rw, modified by the current value of the file mode creation mask umask(1). OPTIONS
The following option is supported: -m mode Sets the file permission bits of the newly-created FIFO to the specified mode value. The mode option-argument will be the same as the mode operand defined for the chmod(1) command. In <symbolicmode> strings, the op characters + and - will be interpreted rela- tive to an assumed initial mode of a=rw. OPERANDS
The following operand is supported: file A path name of the FIFO special file to be created. USAGE
See largefile(5) for the description of the behavior of mkfifo when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes). ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of mkfifo: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 All the specified FIFO special files were created successfully. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
mkfifo(3C), attributes(5), environ(5), largefile(5), standards(5) SunOS 5.10 16 Sep 1996 mkfifo(1M)
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mkfifo(3C) Standard C Library Functions mkfifo(3C) NAME
mkfifo - make a FIFO special file SYNOPSIS
#include <sys/types.h> #include <sys/stat.h> int mkfifo(const char *path, mode_t mode); DESCRIPTION
The mkfifo() function creates a new FIFO special file named by the pathname pointed to by path. The file permission bits of the new FIFO are initialized from mode. The file permission bits of the mode argument are modified by the process's file creation mask (see umask(2)). Bits other than the file permission bits in mode are ignored. If path names a symbolic link, mkfifo() fails and sets errno to EEXIST. The FIFO's user ID is set to the process's effective user ID. The FIFO's group ID is set to the group ID of the parent directory or to the effective group ID of the process. The mkfifo() function calls mknod(2) to create the file. Upon successful completion, mkfifo() marks for update the st_atime, st_ctime, and st_mtime fields of the file. Also, the st_ctime and st_mtime fields of the directory that contains the new entry are marked for update. RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
The mkfifo() function will fail if: EACCES A component of the path prefix denies search permission, or write permission is denied on the parent directory of the FIFO to be created. EEXIST The named file already exists. ELOOP A loop exists in symbolic links encountered during resolution of the path argument. ENAMETOOLONG The length of the path argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}. ENOENT A component of the path prefix specified by path does not name an existing directory or path is an empty string. ENOSPC The directory that would contain the new file cannot be extended or the file system is out of file-allocation resources. ENOTDIR A component of the path prefix is not a directory. EROFS The named file resides on a read-only file system. The mkfifo() function may fail if: ELOOP Too many symbolic links were encountered in resolving path. ENAMETOOLONG The length of the path argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}. EXAMPLES
Example 1 Create a FIFO File The following example demonstrates how to create a FIFO file named /home/cnd/mod_done with read and write permissions for the owner and read permissions for the group and others. #include sys/types.h> #include sys/stat.h> int status; ... status = mkfifo("/home/cnd/mod_done", S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH); ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
mkdir(1), chmod(2), exec(2), mknod(2), umask(2), stat.h(3HEAD), ufs(7FS), attributes(5), standards(5) SunOS 5.11 24 Apr 2002 mkfifo(3C)