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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-02-16 13:20:56 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-02-16 13:20:56 +0000
commit3718832a1542f7bf786a1678741b8566ad3a35c6 (patch)
treeac5851de53237fb3a0c77c9cead27acd279897f0
parent1e18f1bab3400246129756a35bb5752ba98f4c90 (diff)
downloadbusybox-3718832a1542f7bf786a1678741b8566ad3a35c6.tar.gz
busybox-3718832a1542f7bf786a1678741b8566ad3a35c6.tar.bz2
*: more readable handling of pipe fds. No code changes.
-rw-r--r--archival/libunarchive/open_transformer.c16
-rw-r--r--archival/libunarchive/seek_by_jump.c2
-rw-r--r--archival/libunarchive/seek_by_read.c4
-rw-r--r--archival/tar.c8
-rw-r--r--include/libbb.h7
-rw-r--r--include/unarchive.h4
-rw-r--r--miscutils/crontab.c12
-rw-r--r--networking/httpd.c8
-rw-r--r--networking/ifupdown.c22
-rw-r--r--networking/udhcp/signalpipe.c20
-rw-r--r--runit/runsv.c47
-rw-r--r--runit/runsvdir.c20
12 files changed, 88 insertions, 82 deletions
diff --git a/archival/libunarchive/open_transformer.c b/archival/libunarchive/open_transformer.c
index d6f5e6271..3c551de06 100644
--- a/archival/libunarchive/open_transformer.c
+++ b/archival/libunarchive/open_transformer.c
@@ -15,10 +15,10 @@ int open_transformer(int src_fd,
USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd),
const char *transform_prog)
{
- int fd_pipe[2];
+ struct fd_pair fd_pipe;
int pid;
- xpipe(fd_pipe);
+ xpiped_pair(fd_pipe);
#if BB_MMU
pid = fork();
@@ -30,12 +30,12 @@ int open_transformer(int src_fd,
if (pid == 0) {
/* child process */
- close(fd_pipe[0]); /* We don't want to read from the parent */
+ close(fd_pipe.rd); /* We don't want to read from the parent */
// FIXME: error check?
#if BB_MMU
- transformer(src_fd, fd_pipe[1]);
+ transformer(src_fd, fd_pipe.wr);
if (ENABLE_FEATURE_CLEAN_UP) {
- close(fd_pipe[1]); /* Send EOF */
+ close(fd_pipe.wr); /* Send EOF */
close(src_fd);
}
exit(0);
@@ -43,7 +43,7 @@ int open_transformer(int src_fd,
{
char *argv[4];
xmove_fd(src_fd, 0);
- xmove_fd(fd_pipe[1], 1);
+ xmove_fd(fd_pipe.wr, 1);
argv[0] = (char*)transform_prog;
argv[1] = (char*)"-cf";
argv[2] = (char*)"-";
@@ -56,7 +56,7 @@ int open_transformer(int src_fd,
}
/* parent process */
- close(fd_pipe[1]); /* Don't want to write to the child */
+ close(fd_pipe.wr); /* Don't want to write to the child */
- return fd_pipe[0];
+ return fd_pipe.rd;
}
diff --git a/archival/libunarchive/seek_by_jump.c b/archival/libunarchive/seek_by_jump.c
index edbf46b21..8b5f3e887 100644
--- a/archival/libunarchive/seek_by_jump.c
+++ b/archival/libunarchive/seek_by_jump.c
@@ -6,7 +6,7 @@
#include "libbb.h"
#include "unarchive.h"
-void seek_by_jump(const archive_handle_t *archive_handle, const unsigned int amount)
+void seek_by_jump(const archive_handle_t *archive_handle, unsigned amount)
{
if (lseek(archive_handle->src_fd, (off_t) amount, SEEK_CUR) == (off_t) -1) {
#if ENABLE_FEATURE_UNARCHIVE_TAPE
diff --git a/archival/libunarchive/seek_by_read.c b/archival/libunarchive/seek_by_read.c
index 452d82d10..1f2b80571 100644
--- a/archival/libunarchive/seek_by_read.c
+++ b/archival/libunarchive/seek_by_read.c
@@ -6,10 +6,10 @@
#include "libbb.h"
#include "unarchive.h"
-/* If we are reading through a pipe(), or from stdin then we can't lseek,
+/* If we are reading through a pipe, or from stdin then we can't lseek,
* we must read and discard the data to skip over it.
*/
-void seek_by_read(const archive_handle_t *archive_handle, const unsigned int jump_size)
+void seek_by_read(const archive_handle_t *archive_handle, unsigned jump_size)
{
if (jump_size)
bb_copyfd_exact_size(archive_handle->src_fd, -1, jump_size);
diff --git a/archival/tar.c b/archival/tar.c
index a8ff7b894..4ec454b88 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -521,14 +521,14 @@ static int writeTarFile(const int tar_fd, const int verboseFlag,
volatile int vfork_exec_errno = 0;
#if WAIT_FOR_CHILD
- struct { int rd; int wr; } gzipStatusPipe;
+ struct fd_pair gzipStatusPipe;
#endif
- struct { int rd; int wr; } gzipDataPipe;
+ struct fd_pair gzipDataPipe;
const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2";
- xpipe(&gzipDataPipe.rd);
+ xpiped_pair(gzipDataPipe);
#if WAIT_FOR_CHILD
- xpipe(&gzipStatusPipe.rd);
+ xpiped_pair(gzipStatusPipe);
#endif
signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
diff --git a/include/libbb.h b/include/libbb.h
index 3175c8e7f..f505cc718 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -294,10 +294,15 @@ int xopen(const char *pathname, int flags);
int xopen3(const char *pathname, int flags, int mode);
int open_or_warn(const char *pathname, int flags);
int open3_or_warn(const char *pathname, int flags, int mode);
-void xpipe(int filedes[2]);
off_t xlseek(int fd, off_t offset, int whence);
off_t fdlength(int fd);
+void xpipe(int filedes[2]);
+/* In this form code with pipes is much more readable */
+struct fd_pair { int rd; int wr; };
+#define piped_pair(pair) pipe(&((pair).rd))
+#define xpiped_pair(pair) xpipe(&((pair).rd))
+
/* Useful for having small structure members/global variables */
typedef int8_t socktype_t;
typedef int8_t family_t;
diff --git a/include/unarchive.h b/include/unarchive.h
index 8b76217b4..bfd6488db 100644
--- a/include/unarchive.h
+++ b/include/unarchive.h
@@ -92,8 +92,8 @@ extern char get_header_tar_bz2(archive_handle_t *archive_handle);
extern char get_header_tar_lzma(archive_handle_t *archive_handle);
extern char get_header_tar_gz(archive_handle_t *archive_handle);
-extern void seek_by_jump(const archive_handle_t *archive_handle, const unsigned amount);
-extern void seek_by_read(const archive_handle_t *archive_handle, const unsigned amount);
+extern void seek_by_jump(const archive_handle_t *archive_handle, unsigned amount);
+extern void seek_by_read(const archive_handle_t *archive_handle, unsigned amount);
extern ssize_t archive_xread_all_eof(archive_handle_t *archive_handle, unsigned char *buf, size_t count);
diff --git a/miscutils/crontab.c b/miscutils/crontab.c
index 71037b7ee..b292535b1 100644
--- a/miscutils/crontab.c
+++ b/miscutils/crontab.c
@@ -70,18 +70,18 @@ static void edit_file(const struct passwd *pas, const char *file)
static int open_as_user(const struct passwd *pas, const char *file)
{
- int filedes[2];
+ struct fd_pair filedes;
pid_t pid;
char c;
- xpipe(filedes);
+ xpiped_pair(filedes);
pid = vfork();
if (pid < 0) /* ERROR */
bb_perror_msg_and_die("vfork");
if (pid) { /* PARENT */
- int n = safe_read(filedes[0], &c, 1);
- close(filedes[0]);
- close(filedes[1]);
+ int n = safe_read(filedes.rd, &c, 1);
+ close(filedes.rd);
+ close(filedes.wr);
if (n > 0) /* child says it can read */
return open(file, O_RDONLY);
return -1;
@@ -95,7 +95,7 @@ static int open_as_user(const struct passwd *pas, const char *file)
/* We just try to read one byte. If that works, file is readable
* under this user. We signal that by sending one byte to parent. */
if (safe_read(xopen(file, O_RDONLY), &c, 1) == 1)
- safe_write(filedes[1], &c, 1); /* "papa, I can read!" */
+ safe_write(filedes.wr, &c, 1); /* "papa, I can read!" */
_exit(0);
}
diff --git a/networking/httpd.c b/networking/httpd.c
index 1ac49e7a2..2c580b032 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -1305,8 +1305,8 @@ static void send_cgi_and_exit(
const char *cookie,
const char *content_type)
{
- struct { int rd; int wr; } fromCgi; /* CGI -> httpd pipe */
- struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */
+ struct fd_pair fromCgi; /* CGI -> httpd pipe */
+ struct fd_pair toCgi; /* httpd -> CGI pipe */
char *fullpath;
char *script;
char *purl;
@@ -1396,8 +1396,8 @@ static void send_cgi_and_exit(
if (referer)
setenv1("HTTP_REFERER", referer);
- xpipe(&fromCgi.rd);
- xpipe(&toCgi.rd);
+ xpiped_pair(fromCgi);
+ xpiped_pair(toCgi);
pid = vfork();
if (pid < 0) {
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index d0d7bfe5b..58e69530c 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -987,11 +987,11 @@ static int iface_down(struct interface_defn_t *iface)
static int popen2(FILE **in, FILE **out, char *command, char *param)
{
char *argv[3] = { command, param, NULL };
- int infd[2], outfd[2];
+ struct fd_pair infd, outfd;
pid_t pid;
- xpipe(infd);
- xpipe(outfd);
+ xpiped_pair(infd);
+ xpiped_pair(outfd);
fflush(NULL);
pid = fork();
@@ -1001,18 +1001,18 @@ static int popen2(FILE **in, FILE **out, char *command, char *param)
bb_perror_msg_and_die("fork");
case 0: /* child */
/* NB: close _first_, then move fds! */
- close(infd[1]);
- close(outfd[0]);
- xmove_fd(infd[0], 0);
- xmove_fd(outfd[1], 1);
+ close(infd.wr);
+ close(outfd.rd);
+ xmove_fd(infd.rd, 0);
+ xmove_fd(outfd.wr, 1);
BB_EXECVP(command, argv);
_exit(127);
}
/* parent */
- close(infd[0]);
- close(outfd[1]);
- *in = fdopen(infd[1], "w");
- *out = fdopen(outfd[0], "r");
+ close(infd.rd);
+ close(outfd.wr);
+ *in = fdopen(infd.wr, "w");
+ *out = fdopen(outfd.rd, "r");
return pid;
}
diff --git a/networking/udhcp/signalpipe.c b/networking/udhcp/signalpipe.c
index 845aa3a9a..918abd02d 100644
--- a/networking/udhcp/signalpipe.c
+++ b/networking/udhcp/signalpipe.c
@@ -23,12 +23,12 @@
#include "common.h"
-static int signal_pipe[2];
+static struct fd_pair signal_pipe;
static void signal_handler(int sig)
{
unsigned char ch = sig; /* use char, avoid dealing with partial writes */
- if (write(signal_pipe[1], &ch, 1) != 1)
+ if (write(signal_pipe.wr, &ch, 1) != 1)
bb_perror_msg("cannot send signal");
}
@@ -38,10 +38,10 @@ static void signal_handler(int sig)
void udhcp_sp_setup(void)
{
/* was socketpair, but it needs AF_UNIX in kernel */
- xpipe(signal_pipe);
- close_on_exec_on(signal_pipe[0]);
- close_on_exec_on(signal_pipe[1]);
- ndelay_on(signal_pipe[1]);
+ xpiped_pair(signal_pipe);
+ close_on_exec_on(signal_pipe.rd);
+ close_on_exec_on(signal_pipe.wr);
+ ndelay_on(signal_pipe.wr);
signal(SIGUSR1, signal_handler);
signal(SIGUSR2, signal_handler);
signal(SIGTERM, signal_handler);
@@ -54,12 +54,12 @@ void udhcp_sp_setup(void)
int udhcp_sp_fd_set(fd_set *rfds, int extra_fd)
{
FD_ZERO(rfds);
- FD_SET(signal_pipe[0], rfds);
+ FD_SET(signal_pipe.rd, rfds);
if (extra_fd >= 0) {
close_on_exec_on(extra_fd);
FD_SET(extra_fd, rfds);
}
- return signal_pipe[0] > extra_fd ? signal_pipe[0] : extra_fd;
+ return signal_pipe.rd > extra_fd ? signal_pipe.rd : extra_fd;
}
@@ -70,10 +70,10 @@ int udhcp_sp_read(const fd_set *rfds)
{
unsigned char sig;
- if (!FD_ISSET(signal_pipe[0], rfds))
+ if (!FD_ISSET(signal_pipe.rd, rfds))
return 0;
- if (read(signal_pipe[0], &sig, 1) != 1)
+ if (safe_read(signal_pipe.rd, &sig, 1) != 1)
return -1;
return sig;
diff --git a/runit/runsv.c b/runit/runsv.c
index e9a074580..e1d99e2df 100644
--- a/runit/runsv.c
+++ b/runit/runsv.c
@@ -90,8 +90,8 @@ struct globals {
smallint haslog;
smallint sigterm;
smallint pidchanged;
- int selfpipe[2];
- int logpipe[2];
+ struct fd_pair selfpipe;
+ struct fd_pair logpipe;
char *dir;
struct svdir svd[2];
};
@@ -130,13 +130,13 @@ static void warn_cannot(const char *m)
static void s_child(int sig_no)
{
- write(selfpipe[1], "", 1);
+ write(selfpipe.wr, "", 1);
}
static void s_term(int sig_no)
{
sigterm = 1;
- write(selfpipe[1], "", 1); /* XXX */
+ write(selfpipe.wr, "", 1); /* XXX */
}
static char *add_str(char *p, const char *to_add)
@@ -275,7 +275,7 @@ static unsigned custom(struct svdir *s, char c)
return 0;
}
if (!pid) {
- if (haslog && dup2(logpipe[1], 1) == -1)
+ if (haslog && dup2(logpipe.wr, 1) == -1)
warn_cannot("setup stdout for control/?");
prog[0] = a;
prog[1] = NULL;
@@ -335,13 +335,14 @@ static void startservice(struct svdir *s)
if (p == 0) {
/* child */
if (haslog) {
+ /* NB: bug alert! right order is close, then dup2 */
if (s->islog) {
- xdup2(logpipe[0], 0);
- close(logpipe[1]);
xchdir("./log");
+ close(logpipe.wr);
+ xdup2(logpipe.rd, 0);
} else {
- xdup2(logpipe[1], 1);
- close(logpipe[0]);
+ close(logpipe.rd);
+ xdup2(logpipe.wr, 1);
}
}
signal(SIGCHLD, SIG_DFL);
@@ -452,11 +453,11 @@ int runsv_main(int argc, char **argv)
bb_show_usage();
dir = argv[1];
- xpipe(selfpipe);
- close_on_exec_on(selfpipe[0]);
- close_on_exec_on(selfpipe[1]);
- ndelay_on(selfpipe[0]);
- ndelay_on(selfpipe[1]);
+ xpiped_pair(selfpipe);
+ close_on_exec_on(selfpipe.rd);
+ close_on_exec_on(selfpipe.wr);
+ ndelay_on(selfpipe.rd);
+ ndelay_on(selfpipe.wr);
sig_block(SIGCHLD);
sig_catch(SIGCHLD, s_child);
@@ -489,9 +490,9 @@ int runsv_main(int argc, char **argv)
gettimeofday_ns(&svd[1].start);
if (stat("log/down", &s) != -1)
svd[1].want = W_DOWN;
- xpipe(logpipe);
- close_on_exec_on(logpipe[0]);
- close_on_exec_on(logpipe[1]);
+ xpiped_pair(logpipe);
+ close_on_exec_on(logpipe.rd);
+ close_on_exec_on(logpipe.wr);
}
}
@@ -572,7 +573,7 @@ int runsv_main(int argc, char **argv)
if (svd[0].want == W_UP || svd[0].state == S_FINISH)
startservice(&svd[0]);
- x[0].fd = selfpipe[0];
+ x[0].fd = selfpipe.rd;
x[0].events = POLLIN;
x[1].fd = svd[0].fdcontrol;
x[1].events = POLLIN;
@@ -585,7 +586,7 @@ int runsv_main(int argc, char **argv)
sig_block(SIGTERM);
sig_block(SIGCHLD);
- while (read(selfpipe[0], &ch, 1) == 1)
+ while (read(selfpipe.rd, &ch, 1) == 1)
continue;
for (;;) {
@@ -630,7 +631,7 @@ int runsv_main(int argc, char **argv)
sleep(1);
}
}
- }
+ } /* for (;;) */
if (read(svd[0].fdcontrol, &ch, 1) == 1)
ctrl(&svd[0], ch);
if (haslog)
@@ -649,11 +650,11 @@ int runsv_main(int argc, char **argv)
svd[1].want = W_EXIT;
/* stopservice(&svd[1]); */
update_status(&svd[1]);
- close(logpipe[1]);
- close(logpipe[0]);
+ close(logpipe.wr);
+ close(logpipe.rd);
}
}
- }
+ } /* for (;;) */
/* not reached */
return 0;
}
diff --git a/runit/runsvdir.c b/runit/runsvdir.c
index 838490376..4225ac101 100644
--- a/runit/runsvdir.c
+++ b/runit/runsvdir.c
@@ -47,7 +47,7 @@ static char *svdir;
static int svnum;
static char *rplog;
static int rploglen;
-static int logpipe[2];
+static struct fd_pair logpipe;
static struct pollfd pfd[1];
static unsigned stamplog;
static smallint check = 1;
@@ -186,19 +186,19 @@ static int setup_log(void)
warnx("log must have at least seven characters");
return 0;
}
- if (pipe(logpipe)) {
+ if (piped_pair(logpipe)) {
warnx("cannot create pipe for log");
return -1;
}
- close_on_exec_on(logpipe[1]);
- close_on_exec_on(logpipe[0]);
- ndelay_on(logpipe[0]);
- ndelay_on(logpipe[1]);
- if (dup2(logpipe[1], 2) == -1) {
+ close_on_exec_on(logpipe.rd);
+ close_on_exec_on(logpipe.wr);
+ ndelay_on(logpipe.rd);
+ ndelay_on(logpipe.wr);
+ if (dup2(logpipe.wr, 2) == -1) {
warnx("cannot set filedescriptor for log");
return -1;
}
- pfd[0].fd = logpipe[0];
+ pfd[0].fd = logpipe.rd;
pfd[0].events = POLLIN;
stamplog = monotonic_sec();
return 1;
@@ -296,7 +296,7 @@ int runsvdir_main(int argc, char **argv)
if (rplog) {
if ((int)(now - stamplog) >= 0) {
- write(logpipe[1], ".", 1);
+ write(logpipe.wr, ".", 1);
stamplog = now + 900;
}
}
@@ -311,7 +311,7 @@ int runsvdir_main(int argc, char **argv)
sig_unblock(SIGCHLD);
if (pfd[0].revents & POLLIN) {
- while (read(logpipe[0], &ch, 1) > 0) {
+ while (read(logpipe.rd, &ch, 1) > 0) {
if (ch) {
for (i = 6; i < rploglen; i++)
rplog[i-1] = rplog[i];