|FORK(2)||System Calls Manual||FORK(2)|
NAME¶fork — create a new process
LIBRARY¶Standard C Library (libc, -lc)
#include <unistd.h> pid_t
DESCRIPTION¶The fork() system call causes creation of a new process. The new process (child process) is an exact copy of the calling process (parent process) except for the following:
- The child process has a unique process ID.
- The child process has a different parent process ID (i.e., the process ID of the parent process).
- The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that, for instance, file pointers in file objects are shared between the child and the parent, so that an lseek(2) on a descriptor in the child process can affect a subsequent read(2) or write(2) by the parent. This descriptor copying is also used by the shell to establish standard input and output for newly created processes as well as to set up pipes.
- The child process' resource utilizations are set to 0; see setrlimit(2).
- All interval timers are cleared; see setitimer(2).
RETURN VALUES¶Upon successful completion, fork() returns a value of 0 to the child process and returns the process ID of the child process to the parent process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to indicate the error.
ERRORS¶The fork() system call will fail and no child process will be created if:
- The system-imposed limit on the total number of processes
under execution would be exceeded. The limit is given by the
sysctl(3) MIB variable
KERN_MAXPROC. (The limit is actually ten less than this except for the super user).
- The user is not the super user, and the system-imposed
limit on the total number of processes under execution by a single user
would be exceeded. The limit is given by the sysctl(3)
- The user is not the super user, and the soft resource limit
corresponding to the resource argument
RLIMIT_NPROCwould be exceeded (see getrlimit(2)).
- There is insufficient swap space for the new process.
SEE ALSO¶execve(2), rfork(2), setitimer(2), setrlimit(2), vfork(2), wait(2)
HISTORY¶The fork() function appeared in Version 6 AT&T UNIX.
|June 4, 1993||Debian|