diff --git a/libc/include/bits/types/sigset_t.h b/libc/include/bits/types/sigset_t.h
new file mode 100644
index 0000000..ff879ef
--- /dev/null
+++ b/libc/include/bits/types/sigset_t.h
@@ -0,0 +1,6 @@
+#ifndef _BITS_TYPES_SIGSET_T_H
+#define _BITS_TYPES_SIGSET_T_H
+
+typedef unsigned long sigset_t;
+
+#endif // !_BITS_TYPES_SIGSET_T_H
diff --git a/libc/include/bits/types/struct_sched_param.h b/libc/include/bits/types/struct_sched_param.h
new file mode 100644
index 0000000..810ef88
--- /dev/null
+++ b/libc/include/bits/types/struct_sched_param.h
@@ -0,0 +1,9 @@
+#ifndef _BITS_TYPES_STRUCT_SCHED_PARAM_T_H
+#define _BITS_TYPES_STRUCT_SCHED_PARAM_T_H
+
+struct sched_param
+{
+    int sched_priority;
+};
+
+#endif // !_BITS_TYPES_STRUCT_SCHED_PARAM_T_H
diff --git a/libc/include/bits/waitstatus.h b/libc/include/bits/waitstatus.h
new file mode 100644
index 0000000..bdec239
--- /dev/null
+++ b/libc/include/bits/waitstatus.h
@@ -0,0 +1,14 @@
+#ifndef _BITS_WAITSTATUS_H
+#define _BITS_WAITSTATUS_H
+
+#define __W_CONTINUED 0xFFFF
+
+#define __WEXITSTATUS(status) (((status)&0xFF00) >> 8)
+#define __WTERMSIG(status) ((status)&0x7F)
+#define __WSTOPSIG(status) __WEXITSTATUS(status)
+#define __WIFEXITED(status) (__WTERMSIG(status) == 0)
+#define __WIFSIGNALED(status) (((signed char)(((status)&0x7F) + 1) >> 1) > 0)
+#define __WIFSTOPPED(status) (((status)&0xFF) == 0x7F)
+#define __WIFCONTINUED(status) ((status) == __W_CONTINUED)
+
+#endif
diff --git a/libc/include/errno.h b/libc/include/errno.h
index 361f042..4185ae7 100644
--- a/libc/include/errno.h
+++ b/libc/include/errno.h
@@ -1,40 +1,135 @@
 #ifndef _ERRNO_H
 #define _ERRNO_H
 
-#define EPERM 1    /* Operation not permitted */
-#define ENOENT 2   /* No such file or directory */
-#define ESRCH 3    /* No such process */
-#define EINTR 4    /* Interrupted system call */
-#define EIO 5      /* I/O error */
-#define ENXIO 6    /* No such device or address */
-#define E2BIG 7    /* Argument list too long */
-#define ENOEXEC 8  /* Exec format error */
-#define EBADF 9    /* Bad file number */
-#define ECHILD 10  /* No child processes */
-#define EAGAIN 11  /* Try again */
-#define ENOMEM 12  /* Out of memory */
-#define EACCES 13  /* Permission denied */
-#define EFAULT 14  /* Bad address */
-#define ENOTBLK 15 /* Block device required */
-#define EBUSY 16   /* Device or resource busy */
-#define EEXIST 17  /* File exists */
-#define EXDEV 18   /* Cross-device link */
-#define ENODEV 19  /* No such device */
-#define ENOTDIR 20 /* Not a directory */
-#define EISDIR 21  /* Is a directory */
-#define EINVAL 22  /* Invalid argument */
-#define ENFILE 23  /* File table overflow */
-#define EMFILE 24  /* Too many open files */
-#define ENOTTY 25  /* Not a typewriter */
-#define ETXTBSY 26 /* Text file busy */
-#define EFBIG 27   /* File too large */
-#define ENOSPC 28  /* No space left on device */
-#define ESPIPE 29  /* Illegal seek */
-#define EROFS 30   /* Read-only file system */
-#define EMLINK 31  /* Too many links */
-#define EPIPE 32   /* Broken pipe */
-#define EDOM 33    /* Math argument out of domain of func */
-#define ERANGE 34  /* Math result not representable */
+#define EPERM 1             /* Operation not permitted */
+#define ENOENT 2            /* No such file or directory */
+#define ESRCH 3             /* No such process */
+#define EINTR 4             /* Interrupted system call */
+#define EIO 5               /* I/O error */
+#define ENXIO 6             /* No such device or address */
+#define E2BIG 7             /* Argument list too long */
+#define ENOEXEC 8           /* Exec format error */
+#define EBADF 9             /* Bad file number */
+#define ECHILD 10           /* No child processes */
+#define EAGAIN 11           /* Try again */
+#define ENOMEM 12           /* Out of memory */
+#define EACCES 13           /* Permission denied */
+#define EFAULT 14           /* Bad address */
+#define ENOTBLK 15          /* Block device required */
+#define EBUSY 16            /* Device or resource busy */
+#define EEXIST 17           /* File exists */
+#define EXDEV 18            /* Cross-device link */
+#define ENODEV 19           /* No such device */
+#define ENOTDIR 20          /* Not a directory */
+#define EISDIR 21           /* Is a directory */
+#define EINVAL 22           /* Invalid argument */
+#define ENFILE 23           /* File table overflow */
+#define EMFILE 24           /* Too many open files */
+#define ENOTTY 25           /* Not a typewriter */
+#define ETXTBSY 26          /* Text file busy */
+#define EFBIG 27            /* File too large */
+#define ENOSPC 28           /* No space left on device */
+#define ESPIPE 29           /* Illegal seek */
+#define EROFS 30            /* Read-only file system */
+#define EMLINK 31           /* Too many links */
+#define EPIPE 32            /* Broken pipe */
+#define EDOM 33             /* Math argument out of domain of func */
+#define ERANGE 34           /* Math result not representable */
+#define EDEADLK 35          /* Resource deadlock would occur */
+#define ENAMETOOLONG 36     /* File name too long */
+#define ENOLCK 37           /* No record locks available */
+#define ENOSYS 38           /* Function not implemented */
+#define ENOTEMPTY 39        /* Directory not empty */
+#define ELOOP 40            /* Too many symbolic links encountered */
+#define ENOMSG 42           /* No message of desired type */
+#define EIDRM 43            /* Identifier removed */
+#define ECHRNG 44           /* Channel number out of range */
+#define EL2NSYNC 45         /* Level 2 not synchronized */
+#define EL3HLT 46           /* Level 3 halted */
+#define EL3RST 47           /* Level 3 reset */
+#define ELNRNG 48           /* Link number out of range */
+#define EUNATCH 49          /* Protocol driver not attached */
+#define ENOCSI 50           /* No CSI structure available */
+#define EL2HLT 51           /* Level 2 halted */
+#define EBADE 52            /* Invalid exchange */
+#define EBADR 53            /* Invalid request descriptor */
+#define EXFULL 54           /* Exchange full */
+#define ENOANO 55           /* No anode */
+#define EBADRQC 56          /* Invalid request code */
+#define EBADSLT 57          /* Invalid slot */
+#define EBFONT 59           /* Bad font file format */
+#define ENOSTR 60           /* Device not a stream */
+#define ENODATA 61          /* No data available */
+#define ETIME 62            /* Timer expired */
+#define ENOSR 63            /* Out of streams resources */
+#define ENONET 64           /* Machine is not on the network */
+#define ENOPKG 65           /* Package not installed */
+#define EREMOTE 66          /* Object is remote */
+#define ENOLINK 67          /* Link has been severed */
+#define EADV 68             /* Advertise error */
+#define ESRMNT 69           /* Srmount error */
+#define ECOMM 70            /* Communication error on send */
+#define EPROTO 71           /* Protocol error */
+#define EMULTIHOP 72        /* Multihop attempted */
+#define EDOTDOT 73          /* RFS specific error */
+#define EBADMSG 74          /* Not a data message */
+#define EOVERFLOW 75        /* Value too large for defined data type */
+#define ENOTUNIQ 76         /* Name not unique on network */
+#define EBADFD 77           /* File descriptor in bad state */
+#define EREMCHG 78          /* Remote address changed */
+#define ELIBACC 79          /* Can not access a needed shared library */
+#define ELIBBAD 80          /* Accessing a corrupted shared library */
+#define ELIBSCN 81          /* .lib section in a.out corrupted */
+#define ELIBMAX 82          /* Attempting to link in too many shared libraries */
+#define ELIBEXEC 83         /* Cannot exec a shared library directly */
+#define EILSEQ 84           /* Illegal byte sequence */
+#define ERESTART 85         /* Interrupted system call should be restarted */
+#define ESTRPIPE 86         /* Streams pipe error */
+#define EUSERS 87           /* Too many users */
+#define ENOTSOCK 88         /* Socket operation on non-socket */
+#define EDESTADDRREQ 89     /* Destination address required */
+#define EMSGSIZE 90         /* Message too long */
+#define EPROTOTYPE 91       /* Protocol wrong type for socket */
+#define ENOPROTOOPT 92      /* Protocol not available */
+#define EPROTONOSUPPORT 93  /* Protocol not supported */
+#define ESOCKTNOSUPPORT 94  /* Socket type not supported */
+#define EOPNOTSUPP 95       /* Operation not supported on transport endpoint */
+#define EPFNOSUPPORT 96     /* Protocol family not supported */
+#define EAFNOSUPPORT 97     /* Address family not supported by protocol */
+#define EADDRINUSE 98       /* Address already in use */
+#define EADDRNOTAVAIL 99    /* Cannot assign requested address */
+#define ENETDOWN 100        /* Network is down */
+#define ENETUNREACH 101     /* Network is unreachable */
+#define ENETRESET 102       /* Network dropped connection because of reset */
+#define ECONNABORTED 103    /* Software caused connection abort */
+#define ECONNRESET 104      /* Connection reset by peer */
+#define ENOBUFS 105         /* No buffer space available */
+#define EISCONN 106         /* Transport endpoint is already connected */
+#define ENOTCONN 107        /* Transport endpoint is not connected */
+#define ESHUTDOWN 108       /* Cannot send after transport endpoint shutdown */
+#define ETOOMANYREFS 109    /* Too many references: cannot splice */
+#define ETIMEDOUT 110       /* Connection timed out */
+#define ECONNREFUSED 111    /* Connection refused */
+#define EHOSTDOWN 112       /* Host is down */
+#define EHOSTUNREACH 113    /* No route to host */
+#define EALREADY 114        /* Operation already in progress */
+#define EINPROGRESS 115     /* Operation now in progress */
+#define ESTALE 116          /* Stale NFS file handle */
+#define EUCLEAN 117         /* Structure needs cleaning */
+#define ENOTNAM 118         /* Not a XENIX named type file */
+#define ENAVAIL 119         /* No XENIX semaphores available */
+#define EISNAM 120          /* Is a named type file */
+#define EREMOTEIO 121       /* Remote I/O error */
+#define EDQUOT 122          /* Quota exceeded */
+#define ENOMEDIUM 123       /* No medium found */
+#define EMEDIUMTYPE 124     /* Wrong medium type */
+#define ECANCELED 125       /* Operation Canceled */
+#define ENOKEY 126          /* Required key not available */
+#define EKEYEXPIRED 127     /* Key has expired */
+#define EKEYREVOKED 128     /* Key has been revoked */
+#define EKEYREJECTED 129    /* Key was rejected by service */
+#define EOWNERDEAD 130      /* Owner died */
+#define ENOTRECOVERABLE 131 /* State not recoverable */
 
 extern int *__errno_location(void) __attribute__((const));
 #define errno (*__errno_location())
diff --git a/libc/include/signal.h b/libc/include/signal.h
new file mode 100644
index 0000000..9be5e75
--- /dev/null
+++ b/libc/include/signal.h
@@ -0,0 +1,102 @@
+#ifndef _SIGNAL_H
+#define _SIGNAL_H
+
+#include <bits/types/sigset_t.h>
+
+/* https://www-uxsup.csx.cam.ac.uk/courses/moved.Building/signals.pdf */
+/* https://man7.org/linux/man-pages/man7/signal.7.html */
+
+/** @brief Hangup detected on controlling or death of controlling process */
+#define SIGHUP 1
+
+/** @brief Interrupt from keyboard */
+#define SIGINT 2
+
+/** @brief Quit from keyboard */
+#define SIGQUIT 3
+
+/** @brief Illegal Instruction */
+#define SIGILL 4
+
+/** @brief Trace/breakpoint trap */
+#define SIGTRAP 5
+
+/** @brief Abort signal from abort(3) */
+#define SIGABRT 6
+
+/** @brief Bus error (bad memory access) */
+#define SIGBUS 7
+
+/** @brief Floating point exception */
+#define SIGFPE 8
+
+/** @brief Kill signal */
+#define SIGKILL 9
+
+/** @brief User-defined signal 1 */
+#define SIGUSR1 10
+
+/** @brief Invalid memory reference */
+#define SIGSEGV 11
+
+/** @brief User-defined signal 2 */
+#define SIGUSR2 12
+
+/** @brief Broken pipe: write to pipe with no readers */
+#define SIGPIPE 13
+
+/** @brief Timer signal from alarm(2) */
+#define SIGALRM 14
+
+/** @brief Termination signal */
+#define SIGTERM 15
+
+/** @brief Stack fault on coprocessor (unused) */
+#define SIGSTKFLT 16
+
+/** @brief Child stopped or terminated */
+#define SIGCHLD 17
+
+/** @brief Continue if stopped */
+#define SIGCONT 18
+
+/** @brief Stop process */
+#define SIGSTOP 19
+
+/** @brief Stop typed at terminal */
+#define SIGTSTP 20
+
+/** @brief Terminal input for background process */
+#define SIGTTIN 21
+
+/** @brief Terminal output for background process */
+#define SIGTTOU 22
+
+/** @brief Urgent condition on socket */
+#define SIGURG 23
+
+/** @brief CPU time limit exceeded */
+#define SIGXCPU 24
+
+/** @brief File size limit exceeded */
+#define SIGXFSZ 25
+
+/** @brief Virtual timer expired */
+#define SIGVTALRM 26
+
+/** @brief Profiling timer expired */
+#define SIGPROF 27
+
+/** @brief Window resize signal */
+#define SIGWINCH 28
+
+/** @brief I/O now possible */
+#define SIGIO 29
+
+/** @brief Power failure */
+#define SIGPWR 30
+
+/** @brief Bad system call */
+#define SIGSYS 31
+
+#endif // !_SIGNAL_H
diff --git a/libc/include/spawn.h b/libc/include/spawn.h
new file mode 100644
index 0000000..047715e
--- /dev/null
+++ b/libc/include/spawn.h
@@ -0,0 +1,45 @@
+#ifndef _SPAWN_H
+#define _SPAWN_H
+
+#include <stddef.h>
+#include <bits/types/struct_sched_param.h>
+#include <bits/types/sigset_t.h>
+#include <sys/types.h>
+
+struct __spawn_action
+{
+    int __stub;
+};
+
+typedef struct
+{
+    short int __flags;
+    pid_t __pgrp;
+    sigset_t __sd;
+    sigset_t __ss;
+    struct sched_param __sp;
+    int __policy;
+    int __pad[16];
+} posix_spawnattr_t;
+
+typedef struct
+{
+    int __allocated;
+    int __used;
+    struct __spawn_action *__actions;
+    int __pad[16];
+} posix_spawn_file_actions_t;
+
+int posix_spawn(pid_t *pid, const char *path,
+                const posix_spawn_file_actions_t *file_actions,
+                const posix_spawnattr_t *attrp,
+                char *const argv[],
+                char *const envp[]);
+
+int posix_spawnp(pid_t *pid, const char *file,
+                 const posix_spawn_file_actions_t *file_actions,
+                 const posix_spawnattr_t *attrp,
+                 char *const argv[],
+                 char *const envp[]);
+
+#endif // !_SPAWN_H
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index 9c7589c..3875438 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -8,6 +8,9 @@ extern "C"
 {
 #endif
 
+#define EXIT_FAILURE 1
+#define EXIT_SUCCESS 0
+
     void abort(void);
     int atexit(void (*function)(void));
     void exit(int status);
@@ -22,6 +25,8 @@ extern "C"
 
     double atof(const char *nptr);
 
+    extern void perror(const char *__s);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/libc/include/sys/time.h b/libc/include/sys/time.h
index b24289f..71fa583 100644
--- a/libc/include/sys/time.h
+++ b/libc/include/sys/time.h
@@ -1,4 +1,6 @@
 #ifndef _SYS_TIME_H
 #define _SYS_TIME_H
 
+#include <sys/types.h>
+
 #endif
diff --git a/libc/include/sys/types.h b/libc/include/sys/types.h
index 34c1b65..33c68a6 100644
--- a/libc/include/sys/types.h
+++ b/libc/include/sys/types.h
@@ -1,6 +1,17 @@
 #ifndef _SYS_TYPES_H
 #define _SYS_TYPES_H
 
-typedef int pid_t;
+typedef int __pid_t;
+typedef unsigned int __id_t;
+
+#ifndef __pid_t_defined
+typedef __pid_t pid_t;
+#define __pid_t_defined
+#endif
+
+#ifndef __id_t_defined
+typedef __id_t id_t;
+#define __id_t_defined
+#endif
 
 #endif
diff --git a/libc/include/sys/wait.h b/libc/include/sys/wait.h
new file mode 100644
index 0000000..7e94a4b
--- /dev/null
+++ b/libc/include/sys/wait.h
@@ -0,0 +1,101 @@
+#ifndef _SYS_WAIT_H
+#define _SYS_WAIT_H
+
+#include <sys/types.h>
+
+typedef enum
+{
+    P_ALL, /* Wait for any child. */
+    P_PID, /* Wait for specified process. */
+    P_PGID /* Wait for members of process group. */
+} idtype_t;
+
+typedef struct
+{
+    int stub;
+} siginfo_t;
+
+#include <bits/waitstatus.h>
+
+/**
+ * @brief Macro for extracting the exit status from a status value.
+ *
+ * If the child process terminated normally by calling exit(3) or _exit(2),
+ * the macro WEXITSTATUS() returns the low-order 8 bits of the status value.
+ *
+ * @param status The status value to extract the exit status from.
+ * @return The exit status of the child process.
+ */
+#define WEXITSTATUS(status) __WEXITSTATUS(status)
+
+/**
+ * @brief Macro for extracting the termination signal from a status value.
+ *
+ * If the child process was terminated by a signal, the macro WTERMSIG()
+ * returns the signal number of the terminating signal.
+ *
+ * @param status The status value to extract the termination signal from.
+ * @return The termination signal of the child process.
+ */
+#define WTERMSIG(status) __WTERMSIG(status)
+
+/**
+ * @brief Macro for extracting the stop signal from a status value.
+ *
+ * If the child process was stopped by a signal, the macro WSTOPSIG()
+ * returns the signal number of the stop signal.
+ *
+ * @param status The status value to extract the stop signal from.
+ * @return The stop signal of the child process.
+ */
+#define WSTOPSIG(status) __WSTOPSIG(status)
+
+/**
+ * @brief Macro for testing whether a process exited normally.
+ *
+ * If the child process terminated normally by calling exit(3) or _exit(2),
+ * the macro WIFEXITED() returns a nonzero value. Otherwise, it returns 0.
+ *
+ * @param status The status value to test.
+ * @return A nonzero value if the child process exited normally, 0 otherwise.
+ */
+#define WIFEXITED(status) __WIFEXITED(status)
+
+/**
+ * @brief Macro for testing whether a process was terminated by a signal.
+ *
+ * If the child process was terminated by a signal, the macro WIFSIGNALED()
+ * returns a nonzero value. Otherwise, it returns 0.
+ *
+ * @param status The status value to test.
+ * @return A nonzero value if the child process was terminated by a signal, 0 otherwise.
+ */
+#define WIFSIGNALED(status) __WIFSIGNALED(status)
+
+/**
+ * @brief Macro for testing whether a process was stopped by a signal.
+ *
+ * If the child process was stopped by a signal, the macro WIFSTOPPED()
+ * returns a nonzero value. Otherwise, it returns 0.
+ *
+ * @param status The status value to test.
+ * @return A nonzero value if the child process was stopped by a signal, 0 otherwise.
+ */
+#define WIFSTOPPED(status) __WIFSTOPPED(status)
+
+/**
+ * @brief Macro for testing whether a stopped process was continued.
+ *
+ * If the child process was stopped and has been resumed by delivery of SIGCONT,
+ * the macro WIFCONTINUED() returns a nonzero value. Otherwise, it returns 0.
+ *
+ * @param status The status value to test.
+ * @return A nonzero value if the child process was continued, 0 otherwise.
+ */
+#define WIFCONTINUED(status) __WIFCONTINUED(status)
+
+pid_t wait(int *wstatus);
+pid_t waitpid(pid_t pid, int *wstatus, int options);
+int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options);
+
+#endif
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 35896ea..93f950a 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -8,9 +8,16 @@ extern "C"
 {
 #endif
 
-    int execv(const char *, char *const[]);
-    int execve(const char *, char *const[], char *const[]);
-    int execvp(const char *, char *const[]);
+    extern char **environ;
+
+    int execl(const char *pathname, const char *arg, ...);
+    int execlp(const char *file, const char *arg, ...);
+    int execle(const char *pathname, const char *arg, ...);
+    int execv(const char *pathname, char *const argv[]);
+    int execvp(const char *file, char *const argv[]);
+    int execvpe(const char *file, char *const argv[], char *const envp[]);
+    int execve(const char *pathname, char *const argv[], char *const envp[]);
+
     pid_t fork(void);
 
 #ifdef __cplusplus
diff --git a/libc/src/InitArray.c b/libc/src/InitArray.c
index 3df8b3e..aa23c34 100644
--- a/libc/src/InitArray.c
+++ b/libc/src/InitArray.c
@@ -5,20 +5,20 @@
 // extern void (*__fini_array_start []) (void) __attribute__((weak));
 // extern void (*__fini_array_end []) (void) __attribute__((weak));
 
-typedef void (*CallPtr)(void);
-extern CallPtr __init_array_start[0], __init_array_end[0];
-extern CallPtr __fini_array_start[0], __fini_array_end[0];
+typedef void (*fct)(void);
+extern fct __init_array_start[0], __init_array_end[0];
+extern fct __fini_array_start[0], __fini_array_end[0];
 
 // TODO: This is not working properly
 
 void __libc_init_array(void)
 {
-    // for (CallPtr *func = __init_array_start; func != __init_array_end; func++)
-    //     (*func)();
+    for (fct *func = __init_array_start; func != __init_array_end; func++)
+        (*func)();
 }
 
 void __libc_fini_array(void)
 {
-    // for (CallPtr *func = __fini_array_start; func != __fini_array_end; func++)
-    //     (*func)();
+    for (fct *func = __fini_array_start; func != __fini_array_end; func++)
+        (*func)();
 }
diff --git a/libc/src/std/io/file.c b/libc/src/std/io/file.c
index 562618e..ac95aae 100644
--- a/libc/src/std/io/file.c
+++ b/libc/src/std/io/file.c
@@ -32,7 +32,6 @@ int fseek(FILE *stream, long offset, int whence)
         stream->offset = offset;
         break;
     case SEEK_CUR:
-        stream->offset += offset;
         break;
     case SEEK_END:
         // stream->offset = syscall1(_FileLength, (uint64_t)File->KernelPrivate) + offset;
diff --git a/libc/src/std/io/put.c b/libc/src/std/io/put.c
index fb7203c..ad0a900 100644
--- a/libc/src/std/io/put.c
+++ b/libc/src/std/io/put.c
@@ -28,3 +28,8 @@ int puts(const char *s)
     for (int i = 0; s[i] != '\0'; i++)
         fputc(s[i], stdout);
 }
+
+void perror(const char *__s)
+{
+    fputs(__s, stderr);
+}
diff --git a/libc/src/std/lib.c b/libc/src/std/lib.c
index 286a128..668bb20 100644
--- a/libc/src/std/lib.c
+++ b/libc/src/std/lib.c
@@ -6,19 +6,23 @@
 
 void abort(void)
 {
+    __asm__ __volatile__("syscall"
+                         :
+                         : "a"(0), "D"(-0xAB057)
+                         : "rcx", "r11", "memory");
+
     while (1)
         ;
 }
 
 int atexit(void (*function)(void))
 {
-    return 0;
+    return 1;
 }
 
 void exit(int status)
 {
-    while (1)
-        ;
+    _exit(status);
 }
 
 int atoi(const char *nptr)
@@ -64,7 +68,7 @@ void free(void *Address)
 
 int system(const char *command)
 {
-    return 0;
+    return -1;
 }
 
 double atof(const char *nptr)
diff --git a/libc/src/std/spawn.c b/libc/src/std/spawn.c
new file mode 100644
index 0000000..a777340
--- /dev/null
+++ b/libc/src/std/spawn.c
@@ -0,0 +1,17 @@
+#include <spawn.h>
+
+int posix_spawn(pid_t *pid, const char *path,
+                const posix_spawn_file_actions_t *file_actions,
+                const posix_spawnattr_t *attrp,
+                char *const argv[],
+                char *const envp[])
+{
+}
+
+int posix_spawnp(pid_t *pid, const char *file,
+                 const posix_spawn_file_actions_t *file_actions,
+                 const posix_spawnattr_t *attrp,
+                 char *const argv[],
+                 char *const envp[])
+{
+}
diff --git a/libc/src/std/sys/wait.c b/libc/src/std/sys/wait.c
new file mode 100644
index 0000000..845c709
--- /dev/null
+++ b/libc/src/std/sys/wait.c
@@ -0,0 +1,14 @@
+#include <sys/wait.h>
+
+pid_t wait(int *wstatus)
+{
+    return waitpid(-1, &wstatus, 0);
+}
+
+pid_t waitpid(pid_t pid, int *wstatus, int options)
+{
+}
+
+int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options)
+{
+}
diff --git a/libc/src/std/uni/exe.c b/libc/src/std/uni/exe.c
new file mode 100644
index 0000000..7fd31f5
--- /dev/null
+++ b/libc/src/std/uni/exe.c
@@ -0,0 +1,44 @@
+#include <unistd.h>
+#include <stddef.h>
+#include <errno.h>
+#include "../../../Kernel/syscalls.h"
+
+int execl(const char *pathname, const char *arg, ...)
+{
+    return -1;
+}
+
+int execlp(const char *file, const char *arg, ...)
+{
+    return -1;
+}
+
+int execle(const char *pathname, const char *arg, ...)
+{
+    return -1;
+}
+
+int execv(const char *pathname, char *const argv[])
+{
+    return -1;
+}
+
+int execvp(const char *file, char *const argv[])
+{
+    return -1;
+}
+
+int execvpe(const char *file, char *const argv[], char *const envp[])
+{
+    return -1;
+}
+
+int execve(const char *pathname, char *const argv[], char *const envp[])
+{
+    return -1;
+}
+
+pid_t fork(void)
+{
+    return syscall0(_Fork);
+}