mirror of git://git.musl-libc.org/musl
fix faccessat AT_EACCESS path not to leave zombie processes
I mistakenly assumed that clone without a signal produced processes that would not become zombies; however, waitpid with __WCLONE is required to release their pids.
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@ -1,5 +1,6 @@
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#include <unistd.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#include "syscall.h"
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#include "syscall.h"
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#include "pthread_impl.h"
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#include "pthread_impl.h"
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@ -32,6 +33,8 @@ int faccessat(int fd, const char *filename, int amode, int flag)
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char stack[1024];
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char stack[1024];
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sigset_t set;
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sigset_t set;
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pid_t pid;
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int status;
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int ret, p[2];
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int ret, p[2];
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if (pipe2(p, O_CLOEXEC)) return __syscall_ret(-EBUSY);
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if (pipe2(p, O_CLOEXEC)) return __syscall_ret(-EBUSY);
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@ -39,12 +42,13 @@ int faccessat(int fd, const char *filename, int amode, int flag)
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__block_all_sigs(&set);
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__block_all_sigs(&set);
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ret = __clone(checker, stack+sizeof stack, 0, &c);
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pid = __clone(checker, stack+sizeof stack, 0, &c);
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__syscall(SYS_close, p[1]);
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__syscall(SYS_close, p[1]);
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if (ret<0 || __syscall(SYS_read, p[0], &ret, sizeof ret) != sizeof(ret))
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if (pid<0 || __syscall(SYS_read, p[0], &ret, sizeof ret) != sizeof(ret))
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ret = -EBUSY;
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ret = -EBUSY;
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__syscall(SYS_close, p[0]);
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__syscall(SYS_close, p[0]);
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__syscall(SYS_wait4, pid, &status, __WCLONE, 0);
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__restore_sigs(&set);
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__restore_sigs(&set);
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