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creat(2) [v7 man page]

CREAT(2)							System Calls Manual							  CREAT(2)

creat - create a new file SYNOPSIS
creat(name, mode) char *name; DESCRIPTION
Creat creates a new file or prepares to rewrite an existing file called name, given as the address of a null-terminated string. If the file did not exist, it is given mode mode, as modified by the process's mode mask (see umask(2)). Also see chmod(2) for the construction of the mode argument. If the file did exist, its mode and owner remain unchanged but it is truncated to 0 length. The file is also opened for writing, and its file descriptor is returned. The mode given is arbitrary; it need not allow writing. This feature is used by programs which deal with temporary files of fixed names. The creation is done with a mode that forbids writing. Then if a second instance of the program attempts a creat, an error is returned and the program knows that the name is unusable for the moment. SEE ALSO
write(2), close(2), chmod(2), umask (2) DIAGNOSTICS
The value -1 is returned if: a needed directory is not searchable; the file does not exist and the directory in which it is to be created is not writable; the file does exist and is unwritable; the file is a directory; there are already too many files open. ASSEMBLER
(creat = 8.) sys creat; name; mode (file descriptor in r0) CREAT(2)

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creat(2)							   System Calls 							  creat(2)

creat - create a new file or rewrite an existing one SYNOPSIS
#include <sys/stat.h> #include <fcntl.h> int creat(const char *path, mode_t mode); DESCRIPTION
The function call creat(path, mode) is equivalent to: open(path, O_WRONLY | O_CREAT | O_TRUNC, mode) RETURN VALUES
Refer to open(2). ERRORS
Refer to open(2). EXAMPLES
Example 1: Creating a File The following example creates the file /tmp/file with read and write permissions for the file owner and read permission for group and oth- ers. The resulting file descriptor is assigned to the fd variable. #include <fcntl.h> ... int fd; mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; char *filename = "/tmp/file"; ... fd = creat(filename, mode); ... USAGE
The creat() function has a transitional interface for 64-bit file offsets. See lf64(5). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
open(2), attributes(5), largefile(5), lf64(5), standards(5) SunOS 5.10 25 Mar 2002 creat(2)
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