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libc: Add fork()
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This commit is contained in:
apio 2023-03-18 23:58:56 +01:00
parent 54f2d35416
commit 40f01c825d
Signed by: apio
GPG Key ID: B8A7D06E42258954
3 changed files with 10 additions and 3 deletions
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4
apps/init.c
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@ -37,12 +37,12 @@ int main()
fprintf(stderr, "init is running as PID %d\n", getpid()); fprintf(stderr, "init is running as PID %d\n", getpid());
long ret = syscall(SYS_fork); pid_t ret = fork();
if (ret == 0) if (ret == 0)
{ {
char* argv[] = { "/bin/hello", "--help", NULL }; char* argv[] = { "/bin/hello", "--help", NULL };
execv("/bin/hello", argv); execv("/bin/hello", argv);
} }
else { printf("my child is PID %ld!\n", ret); } else { printf("my child is PID %d!\n", ret); }
} }

3
libc/include/unistd.h
View File

@ -18,7 +18,8 @@ extern "C"
{ {
#endif #endif
pid_t fork(); /* Create a new process that is a clone of the current one. */
pid_t fork(void);
/* Return the current process' process ID. */ /* Return the current process' process ID. */
pid_t getpid(void); pid_t getpid(void);

6
libc/src/unistd.cpp
View File

@ -8,6 +8,12 @@ extern "C" long arch_invoke_syscall(long, uintptr_t, uintptr_t, uintptr_t, uintp
extern "C" extern "C"
{ {
pid_t fork(void)
{
long rc = syscall(SYS_fork);
__errno_return(rc, int);
}
pid_t getpid(void) pid_t getpid(void)
{ {
return (pid_t)syscall(SYS_getpid); return (pid_t)syscall(SYS_getpid);