cleanup src/linux and src/misc trees, etc.

previously, it was pretty much random which one of these trees a given
function appeared in. they have now been organized into:

src/linux: non-POSIX linux syscalls (possibly shard with other nixen)
src/legacy: various obsolete/legacy functions, mostly wrappers
src/misc: still mostly uncategorized; some misc POSIX, some nonstd
src/crypt: crypt hash functions

further cleanup will be done later.

31 files changed, 107 insertions, 404 deletions

diff --git a/src/linux/daemon.c b/src/linux/daemon.c
deleted file mode 100644
index 1568b1dc..00000000
--- a/src/linux/daemon.c
+++ /dev/null
@@ -1,33 +0,0 @@
-#define _GNU_SOURCE
-#include <fcntl.h>
-#include <unistd.h>
-
-int daemon(int nochdir, int noclose)
-{
-	if (!nochdir && chdir("/"))
-		return -1;
-	if (!noclose) {
-		int fd, failed = 0;
-		if ((fd = open("/dev/null", O_RDWR)) < 0) return -1;
-		if (dup2(fd, 0) < 0 || dup2(fd, 1) < 0 || dup2(fd, 2) < 0)
-			failed++;
-		if (fd > 2) close(fd);
-		if (failed) return -1;
-	}
-
-	switch(fork()) {
-	case 0: break;
-	case -1: return -1;
-	default: _exit(0);
-	}
-
-	if (setsid() < 0) return -1;
-
-	switch(fork()) {
-	case 0: break;
-	case -1: return -1;
-	default: _exit(0);
-	}
-
-	return 0;
-}
diff --git a/src/linux/epoll.c b/src/linux/epoll.c
new file mode 100644
index 00000000..35f70ed1
--- /dev/null
+++ b/src/linux/epoll.c
@@ -0,0 +1,27 @@
+#include <sys/epoll.h>
+#include "syscall.h"
+
+int epoll_create(int size)
+{
+	return syscall(SYS_epoll_create, size);
+}
+
+int epoll_create1(int flags)
+{
+	return syscall(SYS_epoll_create1, flags);
+}
+
+int epoll_ctl(int fd, int op, int fd2, struct epoll_event *ev)
+{
+	return syscall(SYS_epoll_ctl, fd, op, fd2, ev);
+}
+
+int epoll_pwait(int fd, struct epoll_event *ev, int cnt, int to, const sigset_t *sigs)
+{
+	return syscall(SYS_epoll_pwait, fd, ev, cnt, to, sigs, __SYSCALL_SSLEN);
+}
+
+int epoll_wait(int fd, struct epoll_event *ev, int cnt, int to)
+{
+	return syscall(SYS_epoll_wait, fd, ev, cnt, to);
+}
diff --git a/src/linux/epoll_create.c b/src/linux/epoll_create.c
deleted file mode 100644
index 29d82999..00000000
--- a/src/linux/epoll_create.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/epoll.h>
-#include "syscall.h"
-
-int epoll_create(int size)
-{
-	return syscall(SYS_epoll_create, size);
-}
diff --git a/src/linux/epoll_create1.c b/src/linux/epoll_create1.c
deleted file mode 100644
index 380b5dad..00000000
--- a/src/linux/epoll_create1.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/epoll.h>
-#include "syscall.h"
-
-int epoll_create1(int flags)
-{
-	return syscall(SYS_epoll_create1, flags);
-}
diff --git a/src/linux/epoll_ctl.c b/src/linux/epoll_ctl.c
deleted file mode 100644
index da3e999b..00000000
--- a/src/linux/epoll_ctl.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/epoll.h>
-#include "syscall.h"
-
-int epoll_ctl(int fd, int op, int fd2, struct epoll_event *ev)
-{
-	return syscall(SYS_epoll_ctl, fd, op, fd2, ev);
-}
diff --git a/src/linux/epoll_pwait.c b/src/linux/epoll_pwait.c
deleted file mode 100644
index 3ecdbb59..00000000
--- a/src/linux/epoll_pwait.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/epoll.h>
-#include "syscall.h"
-
-int epoll_pwait(int fd, struct epoll_event *ev, int cnt, int to, const sigset_t *sigs)
-{
-	return syscall(SYS_epoll_pwait, fd, ev, cnt, to, sigs, __SYSCALL_SSLEN);
-}
diff --git a/src/linux/epoll_wait.c b/src/linux/epoll_wait.c
deleted file mode 100644
index 9d3924e0..00000000
--- a/src/linux/epoll_wait.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/epoll.h>
-#include "syscall.h"
-
-int epoll_wait(int fd, struct epoll_event *ev, int cnt, int to)
-{
-	return syscall(SYS_epoll_wait, fd, ev, cnt, to);
-}
diff --git a/src/linux/err.c b/src/linux/err.c
deleted file mode 100644
index 0f748538..00000000
--- a/src/linux/err.c
+++ /dev/null
@@ -1,60 +0,0 @@
-#include <err.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <stdlib.h>
-
-void vwarn(const char *fmt, va_list ap)
-{
-	if (fmt) vfprintf(stderr, fmt, ap);
-	perror("");
-}
-
-void vwarnx(const char *fmt, va_list ap)
-{
-	if (fmt) vfprintf(stderr, fmt, ap);
-	putc('\n', stderr);
-}
-
-_Noreturn void verr(int status, const char *fmt, va_list ap)
-{
-	vwarn(fmt, ap);
-	exit(status);
-}
-
-_Noreturn void verrx(int status, const char *fmt, va_list ap)
-{
-	vwarnx(fmt, ap);
-	exit(status);
-}
-
-void warn(const char *fmt, ...)
-{
-	va_list ap;
-	va_start(ap, fmt);
-	vwarn(fmt, ap);
-	va_end(ap);
-}
-
-void warnx(const char *fmt, ...)
-{
-	va_list ap;
-	va_start(ap, fmt);
-	vwarnx(fmt, ap);
-	va_end(ap);
-}
-
-_Noreturn void err(int status, const char *fmt, ...)
-{
-	va_list ap;
-	va_start(ap, fmt);
-	verr(status, fmt, ap);
-	va_end(ap);
-}
-
-_Noreturn void errx(int status, const char *fmt, ...)
-{
-	va_list ap;
-	va_start(ap, fmt);
-	verrx(status, fmt, ap);
-	va_end(ap);
-}
diff --git a/src/linux/eventfd.c b/src/linux/eventfd.c
index cb39a7ba..53066487 100644
--- a/src/linux/eventfd.c
+++ b/src/linux/eventfd.c
@@ -1,7 +1,18 @@
 #include <sys/eventfd.h>
+#include <unistd.h>
 #include "syscall.h"
 
 int eventfd(unsigned int count, int flags)
 {
 	return syscall(flags ? SYS_eventfd2 : SYS_eventfd, count, flags);
 }
+
+int eventfd_read(int fd, eventfd_t *value)
+{
+	return (sizeof(*value) == read(fd, value, sizeof(*value))) ? 0 : -1;
+}
+
+int eventfd_write(int fd, eventfd_t value)
+{
+	return (sizeof(value) == write(fd, &value, sizeof(value))) ? 0 : -1;
+}
diff --git a/src/linux/eventfd_read.c b/src/linux/eventfd_read.c
deleted file mode 100644
index 969e6615..00000000
--- a/src/linux/eventfd_read.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/eventfd.h>
-#include <unistd.h>
-
-int eventfd_read(int fd, eventfd_t *value)
-{
-	return (sizeof(*value) == read(fd, value, sizeof(*value))) ? 0 : -1;
-}
diff --git a/src/linux/eventfd_write.c b/src/linux/eventfd_write.c
deleted file mode 100644
index 734fa367..00000000
--- a/src/linux/eventfd_write.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/eventfd.h>
-#include <unistd.h>
-
-int eventfd_write(int fd, eventfd_t value)
-{
-	return (sizeof(value) == write(fd, &value, sizeof(value))) ? 0 : -1;
-}
diff --git a/src/linux/getdtablesize.c b/src/linux/getdtablesize.c
deleted file mode 100644
index 623a6af3..00000000
--- a/src/linux/getdtablesize.c
+++ /dev/null
@@ -1,9 +0,0 @@
-#include <limits.h>
-#include <sys/resource.h>
-
-int getdtablesize(void)
-{
-	struct rlimit rl;
-	getrlimit(RLIMIT_NOFILE, &rl);
-	return rl.rlim_max < INT_MAX ? rl.rlim_max : INT_MAX;
-}
diff --git a/src/linux/gethostid.c b/src/linux/gethostid.c
deleted file mode 100644
index ea65611a..00000000
--- a/src/linux/gethostid.c
+++ /dev/null
@@ -1,4 +0,0 @@
-long gethostid()
-{
-	return 0;
-}
diff --git a/src/linux/getopt_long.c b/src/linux/getopt_long.c
deleted file mode 100644
index 6d3a4a6e..00000000
--- a/src/linux/getopt_long.c
+++ /dev/null
@@ -1,52 +0,0 @@
-#define _GNU_SOURCE
-#include <stddef.h>
-#include <getopt.h>
-#include <stdio.h>
-
-static int __getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
-{
-	if (optind >= argc || !argv[optind] || argv[optind][0] != '-') return -1;
-	if ((longonly && argv[optind][1]) ||
-		(argv[optind][1] == '-' && argv[optind][2]))
-	{
-		int i;
-		for (i=0; longopts[i].name; i++) {
-			const char *name = longopts[i].name;
-			char *opt = argv[optind]+1;
-			if (*opt == '-') opt++;
-			for (; *name && *name == *opt; name++, opt++);
-			if (*name || (*opt && *opt != '=')) continue;
-			if (*opt == '=') {
-				if (!longopts[i].has_arg) continue;
-				optarg = opt+1;
-			} else {
-				if (longopts[i].has_arg == required_argument) {
-					if (!(optarg = argv[++optind]))
-						return ':';
-				} else optarg = NULL;
-			}
-			optind++;
-			if (idx) *idx = i;
-			if (longopts[i].flag) {
-				*longopts[i].flag = longopts[i].val;
-				return 0;
-			}
-			return longopts[i].val;
-		}
-		if (argv[optind][1] == '-') {
-			optind++;
-			return '?';
-		}
-	}
-	return getopt(argc, argv, optstring);
-}
-
-int getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
-{
-	return __getopt_long(argc, argv, optstring, longopts, idx, 0);
-}
-
-int getopt_long_only(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx)
-{
-	return __getopt_long(argc, argv, optstring, longopts, idx, 1);
-}
diff --git a/src/linux/getpagesize.c b/src/linux/getpagesize.c
deleted file mode 100644
index 5ede652b..00000000
--- a/src/linux/getpagesize.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <unistd.h>
-#include <limits.h>
-
-int getpagesize(void)
-{
-	return PAGE_SIZE;
-}
diff --git a/src/linux/getpass.c b/src/linux/getpass.c
deleted file mode 100644
index d439a2a5..00000000
--- a/src/linux/getpass.c
+++ /dev/null
@@ -1,39 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <termios.h>
-#include <unistd.h>
-#include <fcntl.h>
-
-char *getpass(const char *prompt)
-{
-	int fd;
-	struct termios s, t;
-	ssize_t l;
-	static char password[128];
-
-	if ((fd = open("/dev/tty", O_RDONLY|O_NOCTTY)) < 0) fd = 0;
-
-	tcgetattr(fd, &t);
-	s = t;
-	t.c_lflag &= ~(ECHO|ISIG);
-	t.c_lflag |= ICANON;
-	t.c_iflag &= ~(INLCR|IGNCR);
-	t.c_iflag |= ICRNL;
-	tcsetattr(fd, TCSAFLUSH, &t);
-	tcdrain(fd);
-
-	fputs(prompt, stderr);
-	fflush(stderr);
-
-	l = read(fd, password, sizeof password);
-	if (l >= 0) {
-		if (l > 0 && password[l-1] == '\n') l--;
-		password[l] = 0;
-	}
-
-	tcsetattr(fd, TCSAFLUSH, &s);
-
-	if (fd > 2) close(fd);
-
-	return password;
-}
diff --git a/src/linux/initgroups.c b/src/linux/initgroups.c
deleted file mode 100644
index 545d1859..00000000
--- a/src/linux/initgroups.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include <sys/types.h>
-#include <unistd.h>
-#include <grp.h>
-#include <limits.h>
-
-int getgrouplist(const char *, gid_t, gid_t *, int *);
-int setgroups(size_t, const gid_t *);
-
-int initgroups(const char *user, gid_t gid)
-{
-	gid_t groups[NGROUPS_MAX];
-	int count = NGROUPS_MAX;
-	if (getgrouplist(user, gid, groups, &count) < 0) return -1;
-	return setgroups(count, groups);
-}
diff --git a/src/linux/inotify.c b/src/linux/inotify.c
new file mode 100644
index 00000000..d3b4fa0b
--- /dev/null
+++ b/src/linux/inotify.c
@@ -0,0 +1,21 @@
+#include <sys/inotify.h>
+#include "syscall.h"
+
+int inotify_init()
+{
+	return syscall(SYS_inotify_init);
+}
+int inotify_init1(int flags)
+{
+	return syscall(SYS_inotify_init1, flags);
+}
+
+int inotify_add_watch(int fd, const char *pathname, uint32_t mask)
+{
+	return syscall(SYS_inotify_add_watch, fd, pathname, mask);
+}
+
+int inotify_rm_watch(int fd, uint32_t wd)
+{
+	return syscall(SYS_inotify_rm_watch, fd, wd);
+}
diff --git a/src/linux/inotify_add_watch.c b/src/linux/inotify_add_watch.c
deleted file mode 100644
index 75f207d7..00000000
--- a/src/linux/inotify_add_watch.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/inotify.h>
-#include "syscall.h"
-
-int inotify_add_watch(int fd, const char *pathname, uint32_t mask)
-{
-	return syscall(SYS_inotify_add_watch, fd, pathname, mask);
-}
diff --git a/src/linux/inotify_init.c b/src/linux/inotify_init.c
deleted file mode 100644
index 05070846..00000000
--- a/src/linux/inotify_init.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/inotify.h>
-#include "syscall.h"
-
-int inotify_init()
-{
-	return syscall(SYS_inotify_init);
-}
diff --git a/src/linux/inotify_init1.c b/src/linux/inotify_init1.c
deleted file mode 100644
index 6472a7b2..00000000
--- a/src/linux/inotify_init1.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/inotify.h>
-#include "syscall.h"
-
-int inotify_init1(int flags)
-{
-	return syscall(SYS_inotify_init1, flags);
-}
diff --git a/src/linux/inotify_rm_watch.c b/src/linux/inotify_rm_watch.c
deleted file mode 100644
index cba597eb..00000000
--- a/src/linux/inotify_rm_watch.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/inotify.h>
-#include "syscall.h"
-
-int inotify_rm_watch(int fd, uint32_t wd)
-{
-	return syscall(SYS_inotify_rm_watch, fd, wd);
-}
diff --git a/src/linux/mntent.c b/src/linux/mntent.c
deleted file mode 100644
index 3eafba5e..00000000
--- a/src/linux/mntent.c
+++ /dev/null
@@ -1,68 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <mntent.h>
-#include <errno.h>
-
-FILE *setmntent(const char *name, const char *mode)
-{
-	return fopen(name, mode);
-}
-
-int endmntent(FILE *f)
-{
-	fclose(f);
-	return 1;
-}
-
-struct mntent *getmntent_r(FILE *f, struct mntent *mnt, char *linebuf, int buflen)
-{
-	int cnt, n[8];
-
-	mnt->mnt_freq = 0;
-	mnt->mnt_passno = 0;
-
-	do {
-		fgets(linebuf, buflen, f);
-		if (feof(f) || ferror(f)) return 0;
-		if (!strchr(linebuf, '\n')) {
-			fscanf(f, "%*[^\n]%*[\n]");
-			errno = ERANGE;
-			return 0;
-		}
-		cnt = sscanf(linebuf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
-			n, n+1, n+2, n+3, n+4, n+5, n+6, n+7,
-			&mnt->mnt_freq, &mnt->mnt_passno);
-	} while (cnt < 2 || linebuf[n[0]] == '#');
-
-	linebuf[n[1]] = 0;
-	linebuf[n[3]] = 0;
-	linebuf[n[5]] = 0;
-	linebuf[n[7]] = 0;
-
-	mnt->mnt_fsname = linebuf+n[0];
-	mnt->mnt_dir = linebuf+n[2];
-	mnt->mnt_type = linebuf+n[4];
-	mnt->mnt_opts = linebuf+n[6];
-
-	return mnt;
-}
-
-struct mntent *getmntent(FILE *f)
-{
-	static char linebuf[256];
-	static struct mntent mnt;
-	return getmntent_r(f, &mnt, linebuf, sizeof linebuf);
-}
-
-int addmntent(FILE *f, const struct mntent *mnt)
-{
-	if (fseek(f, 0, SEEK_END)) return 1;
-	return fprintf(f, "%s\t%s\t%s\t%s\t%d\t%d\n",
-		mnt->mnt_fsname, mnt->mnt_dir, mnt->mnt_type, mnt->mnt_opts,
-		mnt->mnt_freq, mnt->mnt_passno) < 0;
-}
-
-char *hasmntopt(const struct mntent *mnt, const char *opt)
-{
-	return strstr(mnt->mnt_opts, opt);
-}
diff --git a/src/linux/mount.c b/src/linux/mount.c
index 83a8db44..34e11af1 100644
--- a/src/linux/mount.c
+++ b/src/linux/mount.c
@@ -5,3 +5,13 @@ int mount(const char *special, const char *dir, const char *fstype, unsigned lon
 {
 	return syscall(SYS_mount, special, dir, fstype, flags, data);
 }
+
+int umount(const char *special)
+{
+	return syscall(SYS_umount2, special, 0);
+}
+
+int umount2(const char *special, int flags)
+{
+	return syscall(SYS_umount2, special, flags);
+}
diff --git a/src/linux/prlimit.c b/src/linux/prlimit.c
new file mode 100644
index 00000000..b9dbb446
--- /dev/null
+++ b/src/linux/prlimit.c
@@ -0,0 +1,8 @@
+#include <unistd.h>
+#include <sys/resource.h>
+#include "syscall.h"
+
+int prlimit(pid_t pid, int resource, const struct rlimit *new_limit, struct rlimit *old_limit)
+{
+	return syscall(SYS_prlimit64, pid, resource, new_limit, old_limit);
+}
diff --git a/src/linux/ptrace.c b/src/linux/ptrace.c
new file mode 100644
index 00000000..83b8022b
--- /dev/null
+++ b/src/linux/ptrace.c
@@ -0,0 +1,25 @@
+#include <sys/ptrace.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include "syscall.h"
+
+long ptrace(int req, ...)
+{
+	va_list ap;
+	pid_t pid;
+	void *addr, *data, *addr2;
+	long ret, result;
+
+	va_start(ap, req);
+	pid = va_arg(ap, pid_t);
+	addr = va_arg(ap, void *);
+	data = va_arg(ap, void *);
+	addr2 = va_arg(ap, void *);
+	va_end(ap);
+
+	if (req-1U < 3) data = &result;
+	ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);
+
+	if (ret < 0 || req-1U >= 3) return ret;
+	return result;
+}
diff --git a/src/linux/swapon.c b/src/linux/swap.c
index 2b40a30b..8137d51e 100644
--- a/src/linux/swapon.c
+++ b/src/linux/swap.c
@@ -5,3 +5,8 @@ int swapon(const char *path, int flags)
 {
 	return syscall(SYS_swapon, path, flags);
 }
+
+int swapoff(const char *path)
+{
+	return syscall(SYS_swapoff, path);
+}
diff --git a/src/linux/swapoff.c b/src/linux/swapoff.c
deleted file mode 100644
index 9f95e82d..00000000
--- a/src/linux/swapoff.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/swap.h>
-#include "syscall.h"
-
-int swapoff(const char *path)
-{
-	return syscall(SYS_swapoff, path);
-}
diff --git a/src/linux/syscall.c b/src/linux/syscall.c
deleted file mode 100644
index 15355609..00000000
--- a/src/linux/syscall.c
+++ /dev/null
@@ -1,19 +0,0 @@
-#include "syscall.h"
-#include <stdarg.h>
-
-#undef syscall
-
-long syscall(long n, ...)
-{
-	va_list ap;
-	long a,b,c,d,e,f;
-	va_start(ap, n);
-	a=va_arg(ap, long);
-	b=va_arg(ap, long);
-	c=va_arg(ap, long);
-	d=va_arg(ap, long);
-	e=va_arg(ap, long);
-	f=va_arg(ap, long);
-	va_end(ap);
-	return __syscall_ret(__syscall(n,a,b,c,d,e,f));
-}
diff --git a/src/linux/umount.c b/src/linux/umount.c
deleted file mode 100644
index fb9b5e73..00000000
--- a/src/linux/umount.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/mount.h>
-#include "syscall.h"
-
-int umount(const char *special)
-{
-	return syscall(SYS_umount2, special, 0);
-}
diff --git a/src/linux/umount2.c b/src/linux/umount2.c
deleted file mode 100644
index 25ad057c..00000000
--- a/src/linux/umount2.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <sys/mount.h>
-#include "syscall.h"
-
-int umount2(const char *special, int flags)
-{
-	return syscall(SYS_umount2, special, flags);
-}