Synopsis
#include <unistd.h>
pid_t vfork(void);
Status
Partially implemented
Conformance
IEEE Std 1003.1, 2004
Description
vfork() creates a new process; share virtual memory
The vfork() function shall be equivalent to fork(), except that the behavior is undefined if the process created by
vfork() either modifies any data other than a variable of type pid_t used to store the return value from vfork(),
or returns from the function in which vfork() was called, or calls any other function before successfully calling
_exit() or one of the exec family of functions.
Return value
Upon successful completion, vfork() shall return 0 to the child process and return the process ID of the child
process to the parent process. Otherwise, -1 shall be returned to the parent, no child process shall be created,
and errno shall be set to indicate the error.
Errors
The vfork() function shall fail if:
EAGAIN- The system-wide limit on the total number of processes under execution would be exceeded, or the system-imposed limit on the total number of processes under execution by a single user would be exceeded.ENOMEM- There is insufficient swap space for the new process.
Tests
Untested
Known bugs
None